15. alaskan north slope stratigraphic nomenclature ...

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and a tabulation of selected well data for Government-drilled North. Slope wells. This work was facili- tated by the National Petroleum. Reserve in Alaska (NPRA) ...
15. ALASKAN NORTH SLOPE STRATIGRAPHIC NOMENCLATURE AND DATA SUMMARY FOR GOVERNMENT-DRILLED WELLS

INTRODUCTION

In the years since the discovery of the Prudhoe Bay oil field in 1968, a great amount of new information on the geology of the North Slope has become available, largely as a result of continued oil exploration and development. In an attempt to organize and summarize some of this information, I have compiled in this chapter an annotated list of North Slope stratigraphic names and a tabulation of selected well data for Government-drilled North Slope wells. This work was facilitated by the National Petroleum Reserve in Alaska (NPRA) computerized data base (Wilcox and others, chapter 39). The list of stratigraphic names (table 15.1)includes names for most of the rock units that might be encountered in wells or surface exposures anywhere on the North Slope. Because these names are accompanied by explanatory notes or references, this chapter provides the first update of North Slope stratigraphic nomenclature since the earlier summary by Kopf (1970). The tabulation of well data (tables 15.2-15.5) is patterned after the summary made by Collins and Robinson (1967, fig. 2) of wells drilled during the Pet-4 Program (U.S. Navy program in Naval Petroleum Reserve No. 4, 1944 to 1953). My summary includes updated information on each of the 81 Pet-4 wells and information on all of the 45 wells drilled by the Government

Manuscript received for publication on January3, 1985.

since then. For each well, the information provided consists of identification, location, hydrocarbon occurrences, and drilling period (table 15.2); total depth and depths of penetration of stratigraphic units (table 15.3); cores attempted and core recovery (table 15.4); and drillstem or production test results (table 15.5). STRATIGRAPHIC NOMENCLATURE

North Slope stratigraphic nomenclature has evolved considerably since Kopf's (1970) tabulation. Table 15.1 includes stratigraphic names, ages, and numbers keyed to the following explanatory notes. These notes describe changes in usage or provide references for names proposed since the summary by Kopf (1970). 1. The age of the Gubik Formation has been extended, at least locally within the NPRA, into the Pliocene (Nelson and Carter, 1985). 2. The Flaxman Formation of Leffingwell (1919) is now included as a member of the Gubik Formation (Dinter, 1985). 3. Quaternary and, locally, latest Tertiary deposits on the North Slope have been assigned to either the Gubik Formation or surficial deposits. In most North Slope wells, rocks of this age are unconsolidated, less than a few hundred feet thick, and neither sampled nor logged. To reflect this general absence of information from wells, the term "surficial deposits and (or) Gubik Formation, undivided" is employed in this summary (table U.S. Geological Survey Professional Paper 1399

15.3). For information on these rocks east of the NPRA, see Detterman and others (1975); for the NPRA, see Williams and others (1977); for the Brooks Range, see Hamilton (1986); and for offshore areas on the Beaufort shelf, see Dinter (1985). 4. The Sagavanirktok Formation, a name originally proposed by Gryc and others (1951) for Tertiary rocks exposed east of the NPRA, was later subdivided by Detterman and others (1975) into members. Molenaar and others (1987), on the basis of new paleontologic and well data east of the NPRA, recognized that the Tertiary deltaic and shallow marine deposits of the Sagavanirktok Formation extend downward without significant change into similar deposits of Late Cretaceous age. To reflect this situation, they proposed revising the definition of the Sagavanirktok Formation to include all Late Cretaceous and Tertiary deltaic and shallow marine deposits east of the NPRA. This unit name and other new unit names for underlying and laterally equivalent rocks are applied to that area east of the shale-out of the Nanushuk Group (fig. 15.1). 5. The age of the type section of the Franklin Bluffs Member of the Sagavanirktok Formation is early to middle Eocene on the basis of palynomorphs and dinoflagellates (Ager and others, 1985). 6. The Staines Tongue (new name) of the Sagavanirktok Formation was proposed by Molenaar and others (1987) for an interval of shallow-marine sandstone and shale of Paleocene age overlain and under-

GEOLOGY AND EXPLORATION OF THE NATIONAL PETROLEUM RESERVE IN ALASKA, 1974-82

TABLE15.1.-Stratigraphic nomenclature for the North Slope of Alaska, listed by increasing age of unit

Unit Quaternary--------------------------------Pleistocene and Pliocene------------------Pleistocene----------------------------Quaternary to Pliocene-----.---------------Tertiary and Late Cretaceous--------------Pliocene and Miocene(?)----------------bZLocene(?) to Eocene-------------------Eocene and Paleocene-------------------Paleocene------------------------------Tertiary and Late Cretaceous--------------Tertiary and Late Cretaceous---------------

Connnent in text

Flaxman ~ber---------------------------------2 Surficial deposits and Gubik Formation, undivided---------- 3 Sagavanirktok Formation------------------------------------ 4 Member-------------------------------------------------Franklin Bluffs Member---------------------------------- 5 Sagwon Mmber------------------------------------------------staines T~~~~-----------------------------------------6 Sagavanirktok Formation and Colville Group, undivided------ 7 7 Sandstone of Colville Group and Sagavanirktok Formation, undivided. 8 Tertiary and Late Cretaceous--------------- ugnu sands------------------------------------------------Tertiary and Late Cretaceous--------------- Jago River Formation--------------------------------------- 9 10 Tertiary and Cretaceous-------------------- Canning Formation----------------------------------------Eocene---------------------------------fikkelsen Tongue--------------------------------------- 10 Cretaceous-----------------------------kctic Creek unit------------------------------------ 11 Late Cretaceous---------------------------- Colville Group--------------------------------------------------Late Cretaceous------------------------Sandstone of Colville Group----------------------------- 7 Shale of Colville Group--------------------------------- 7 Late Cretaceous------------------------Late Cretaceous------------------------West Sak sands----------------------------------- 12 Late Cretaceous------------------------prince Creek Formation---------------------------------------Kogos&d Tongue-----------------------------------------Late Cretaceous---------------------Late Cretaceous---------------------M u v a k Tongue--------------------------------------------Late Cretaceous------------------------Schrader Bluff Formation-------------------------------------Sentinel Hill Member--------------------------------------Late Cretaceous---------------------Barrow Trail Member---------------------------------------Late Cretaceous---------------------Rogers Creek Member---------------------------------------Late Cretaceous---------------------Seabee Formation---------------------------------------------Late Cretaceous------------------------Ayiyak Member---------------------------------------------Late Cretaceous---------------------Shale Wall Member-----------------------------------------Late Cretaceous---------------------Late and Early Cretaceous------------------ Ignek Formation (now abandoned)--------------------------- 13 Tertiary(?) and Late and Early Cretaceous-- H~~shale------------------------------------------------- 14 G ~ zone----------------------------------------~ ~ ~ ~ 14 Late and Early Cretaceous--------------Late Cretaceous------------------------~ ~ d - ~ zone-----------------------------------~ ~ t h ~ ~ i ~ ~ 14 Late Cretaceous------------------------I~~~~~~~ zone----------------------------------------14 h , & 15 Late and Early Cretaceous------------------ ~ ~ ~ ~ G~~~~-------------------------------------------Cornin Formation---------------------------------------------Late and Early Cretaceous--------------Chandler Formation-------------------------------------------Late and Early Cretaceous--------------Niakogon Tongue-------------------------------------------Late Cretaceous---------------------Killik Tongue---------------------------------------------Late(? ) and Early Cretaceous--------Ninul& Fomation--------------------------------------------Late Cretaceous------------------------Tuktu Fomation----------------------------------------------Early Cretaceous-----------------------Early Cretaceous----------------------.-- Grandstand Formation-----------------------------------------16 Early Cretaceous--------------------------- ~~~~k ~~~ti~~------------------------------------------Early Cretaceous--------------------------- Oumalik Formation (now abandoned)------------------------- 16 Early Cretaceous--------------------------- Topagoruk Formation (now abandoned)----------------------- 16 Early Cretaceous--------------------------- aortress ~ ~ ti^^------------------------------~ t ~ i ~ 17 t~b 18 Early Cretaceous--------------------------- ~ ~ t h ~~~~~~~k~----------------------------------------Early Cretaceous and Late Jurassic--------- O k p i k b ti^^--------------------------------------- 19 ~ l ~ k 19 Early Cretaceous--------------------------- ~ i ~ ti^^--------------------------------------Sandstone------------------------------------------20 Early Cretaceous--------------------------- K-k Early Cretaceous--------------------------- Kongakut Formation---------------------------------------- 21 Siltstone member---------------------------------- 21 Early Cretaceous-----------------------pebble shale m&r---------------------------------21 Early Cretaceous-----------------------K-k Sandstone Member--------------------------------- 21 Early Cretaceous-----------------------Clay shale 21 Early Cretaceous-----------------------Early Cretaceous--------------------------- pebble shale unit----------------------------------------- 22 Gm-ray zone----------------------------------------- 22 Early Cretaceous-----------------------Basal sandstone 22 Early Cretaceous-----------------------Early Cretaceous--------------------------- Thornsonsand------------------------------------ 23 Early Cretaceous--------------------------- put ~i~~~ sand-------------------------------------------- 23

15. NORTH SLOPE STRATIGRAPHIC NOMENCLATURE AND DATA SUMMARY FOR GOVERNMENT-DRILLED WELLS

319

TABLE15.1.-Stratigraphic nomenclature for the North Slope of Alaska, listed by increasing age of unit-Continued

Unit

Cment in text

Early Cretaceous--------------------------Early Cretaceous--------------------------Early Cretaceous-----------------------Early Cretaceous-----------------------Early Cretaceous-----------------------Early Cretaceous-----------------------Late Jurassic-----------------------------k t e Jurassic-----------------------------Early Cretaceous and Jurassic-------------Early Cretaceous-----------------------Tingmerkpuk subunit-----------------------------------Early Cretaceous and Jurassic-------------- fingak Sale---------------------------------------------Jurassic-------------------------------Simpson sandstone-------------------------------------Barrow sandstone--------------------------------------Tiglukpuk Formation (now abandoned)----------------------Sag River Sandstone--------------------------------------Karen Creek Sandstone------------------------------------Shublik Formation------------------------------------------Jurassic to Pennsylvanian------------------ Etivluk Group--------------------------------------------Jurassic and Triassic------------------Jurassic----------------------------Triassic to Pennsylvanian--------------Pennsylvanian(?) and Mississippian--------Triassic and Permian----------------------Triassic--------------------------------

pe-an---------------------------------

Permian-----------------------------permian-----------------------------to Mississippian------------------Pennsylvanian and Mississippian--------Pennsylvanian--------------------------Mississippian--------------------------Mississippian--------------------------Mississippian--------------------------Pennsylvanian and Mississippian--------fississippian--------------------------Pennsylvanian and Mississippian---------

wssissippian---------------------------

Mississippian--------------------------Mississippian--------------------------Permian(?) to Devonian--------------------wssissiPpian--------------------------Mississippian--------------------------Mississippim--------------------------Mississippian and Devonian-------------Mississippian(?) and Devonian----------Mississippian-----------------------Devonian-----------------------------

Devonian-------------------------------Devonian and (or) older-------------------Silurian and Ordovician-------------------Devonian to Cambrian or Proterozoic-------&oterozoic--------------------------------

Proterozoic--------------------------------

GEOLOGY AND EXPLORATION OF THE NATIONAL PETROLEUM RESERVE IN ALASKA, 1974-82 TABLE W.2.-Location, class, and operating period of Government-drilled wells on the North Slope of Alaska [ O p e r a t i n g a g e n c i e s : USAF, U.S. A i r F o r c e ; USGS, U.S. G e o l o g i c a l S u r v e y ; USN, U.S. Navy. Well c l a s s e s : abandoned p r o d u c i n g w e l l s : AP-1, o i l ; g a s ; Ap-4, a i l w i t h g a s s h o w s ; AP-5, g a s w i t h o i l s h o w s ; d r y abandoned w e l l s : DA-0, n o shows; DA-1, o i l shows; DA-2, g a s shows; DA-3, o i l and s h o w s ; p r o d u c i n g w e l l s : P-2, g a s ; P-3, o i l and g a s ; P-4, o i l w i t h g a s shows; P-5, g a s w i t h o i l s h o w s ; s u s p e n d e d p r o d u c i n g w e l l s : SP-1, o i l . API, American P e t r o l e u m I n s t i t u t e . S e c t i o n , t o w n s h i p , and r a n g e m e a s u r e d from k g l e s are u.S. G e o l o g i c a l S u r v e y 1 : 2 5 0 , 0 0 0 - s c a l e q u a d r a n g l e s . and m e r i d i a n . Surface elevation: Gr., g r o u n d ; K.B., k e l l y b u s h i n g o r d e r r i c k f l o o r ] -

--

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Elevation

Location

AgenCY

Class

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API w e l l No. L a t N.

Simpson Care T e s t 21-------Simpson Core T e s t 23-------Simpson Core T e s t 24-------North Simpson I------------Barrow Core Rig I----------Barrow Core Rig 2----------Barrow Big Rig I-----------A~~~~ B~~~~~ I-------------South Barrow I-------------S o u t h Barrow 2-------------S o u t h Barrow 3-------------South Barrow 4-------------~~~k I---------------------G r a n d s t a n d I---------------F i s h Creek I---------------I k p i k p u k Core T e s t I-------Oumalik Core T e s t I--------O m a l i k Core T e s t 2--------Oumalik Core T e s t 11-------O m a l i k Core T e s t 12-------h m a l i k I------------------East r n a l i k I-------------Square Lake I--------------Wolf Creek I---------------Wolf Creek 2 b l f Creek 3 ~ i ~ I------------------~ l ~ k K n i f e b l a d e I---------------K n i f e b l a d e 2---------------K n i f e b l a d e 2A S k u l l C l i f f Core T e s t I----Meade I--------------------Simpson Core T e s t I--------Simpson Core T e s t 2--------Simpson Core T e s t 3--------Simpson Core T e s t 4--------Simpson Core T e s t 5--------Simpson Core T e s t 6--------Simpsan Core T e s t 7--------Simpsan Core T e s t 8--------Simpson Core T e s t 9--------Simpson Core T e s t lo-------Simpson Core T e s t 11-------Simpsan Core T e s t 12-------Simpsan Core T e s t 13-------Simpson Core T e s t 14-------Simpson Core T e s t 14A------Simpson Core T e s t 15-------Simpson Core T e s t 16-------Simpsan Core T e s t 17-------Simpson Core T e s t 18-------Simpson Core T e s t 19-------Simpson Core T e s t 20-------Simpson Core T e s t 22-------Simpson Core T e s t 25-------S i m p s o n Core T e s t 26-------Simpson Core T e s t 27-------Simpson Core T e s t 28-------Simpson Care T e s t 29-------Simpson Core T e s t 30-------Simpson Core T e s t 30A------Simpsan Core T e s t 31-------Minga V e l o c i t y T e s t I-------

---------------------------------------------

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-----------------

Topagoruk 1 E a s t T o p a g a r u k I------------

I---------------------

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DA-0 DA-0 DA-0 DA-0 DA-0 DA-0 DA-0 DA-0 DA-1 AP-5 DA-2 AP-5 DA-0 DA-2 Ap-4 DA-0 DA-0 DA-0 DA-0 DA-0 DA-2 DA-3 DA-2 DA-2 DA-2 DA-3 DA-2 DA-1 DA-0 DA-3 DA-0 DA-2 DA-0 DA-0 DA-0 DA-0 DA-0 DA-3 DA-0 DA-1 DA-1 DA-1 DA-0 DA-0 DA-3 DA-3 DA-0 DA-3 DA-3 DA-3 UA-0 DA-0 DA-0 DA-0 DA-3 AP-4 DA-1 DA-0 DA-0 DA-3 DA-3 AP-I DA-0 DA-3 DA-0 DA-2 DA-1 DA-3

50-023-10001 50-023-10002 50-023-10003 50-023-10004 50-023-10005 50-023-10006 50-023-10007 50-023-10008 50-023-10009 50-023-10010 50-023-10011 do------------50-023-10012 do------------50-023-10013 C h a n d l e r Lake---50-057-10001 H a r r i s o n Bay----50-103-10001 I k p i k p u k River--- 50-119-10001 do------------50-119-10002 do---------------------------do------------50-119-10003 do------------50-119-10004 do------------50-119-10005 do------------50-119-10006 do------------50-119-10007 do------------50-119-10008 do------------50-119-10009 do------------50-119-10010 do------------50-119-10011 do------------50-119-10012 do------------50-119-10013 do------------50-119-10014 Meade River-----50-163-10001 do------------50-163-10002 Teshekpuk-------50-279-10001 do------------50-279-10002 do------------50-279-10003 do------------50-279-10004 do------------50-279-10005 do------------50-279-10006 do------------50-279-10007 do------------50-279-10008 do------------50-279-10009 do------------50-279-10010 do------------50-279-10011 do------------50-279-10012 do------------50-279-10013 do------------50-279-10014 do------------50-279-10015 do------------50-279-10016 do------------50-279-10017 do------------50-279-10018 do------------50-279-10019 do------------50-279-10020 do------------50-279-10021 do------------50-279-10022 do------------50-279-10023 do------------50-279-10024 do------------50-279-10025 do------------50-279-10026 do------------50-279-10027 do------------50-279-10028 do------------50-279-10029 do------------50-279-10030 do------------50-279-10031 do------------50-279-10032 do------------50-279-10033 do------------50-279-10034 hiat-----------50-287-10001 do------------50-287-10002 B~=~,,~----------do------------do------------do------------do------------do------------do------------do------------do------------do------------do-------------

Operation period

(ft)

Long W.

Sec.

Naval P e t r o l e u m R e s e r v e No. 4 Program (1944-53)

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TABLE15.3.-Total depth and depths to selected stratigraphic horizons for Government-drilled wells on the North Slope of Alaska [ S e e f i g u r e 1 5 . 3 a n d t a b l e 15.2 f o r l o c a t i o n s o f w e l l s . T o t a l d e p t h and d e p t h t o t o p o f e a c h r o c k u n i t measured from k e l l y b u s h i n g ; a l l d e p t h s t o t o p o f e a c h r o c k u n i t rounded t o n e a r e s t 5 f t e x c e p t f o r u n i t 1. e , e s t i m a t e d d e p t h b a s e d o n r e g i o n a l t r e n d s ; d a s h e s , u n i t n o t p e n e t r a t e d , a b s e n t , o r n o t r e c o g n i z e d . Units: 1 , s u r f i c i a l d e p o s i t s and ( o r ) G u b i k F o r m a t i o n ; 2 , s a n d s t o n e o f t h e C o l v i l l e G r o u p and S a g a v a n i r k t o k F o r m a t i o n , u n d i v i d e d ; 3 , s h a l e o f t h e C o l v i l l e G r o u p ; 4 , Nanushuk G r o u p ; 5 , T o r o k F o r m a t i o n ; 6 , p e b b l e s h a l e u n i t ; 7 , K i n g a k S h a l e ; 8 , Sag R i v e r S a n d s t o n e ; 9 , S h u b l i k F o r m a t i o n ; 1 0 , F i r e C r e e k S i l t s t o n e Member o f t h e I v i s h a k F o r m a t i o n , S a d l e r o c h i t G r o u p ; 1 1 , L e d g e S a n d s t o n e Memb e r o f t h e ~ v i s h a kF o r m a t i o n , S a d l e r o c h i t G r o u p ; 1 2 , K a v i k Member o f t h e I v i s h a k F o r m a t i o n , S a d l e r o c h i t G r o u p ; 1 3 , E c h o o k a F o r m a t i o n , S a d l e r o c h i t G r o u p ; 1 4 , L i s b u r n e G r o u p ; 1 5 , E n d i c o t t Group; 1 6 , basement complex]

Well

Total depth (ft)

Depth t o t o p o f r o c k u n i t ( f t ) 1

2

3

4

5

6

7

8

Naval P e t r o l e u m R e s e r v e No. 4 P r o g r a m ( 1 9 4 4 - 5 3 )

S i m p s o n C o r e T e s t 21-------S i m p s o o G o r e T e s t 23-------S i m p s o n C o r e T e s t 24-------N o r t h S i m p s o n I------------B a r r o w C o r e Rig I----------B a r r o w C o r e Rig 2----------B a r r o w B i g Rig I-----------A r c a n B a r r o w ]-------------S o u t h B a r r o w I-------------South Barrow 2 S o u t h B a r r o w 3-------------South Barrow 4 Avak 1 G r a n d s t a n d l---------------~ i C~ r e e kh I---------------I k p i k p u k Core T e s t I-------O u m a l i k C o r e T e s t I--------O u m a l i k Core T e s t 2--------O u m a l i k C o r e T e s t 11-------O u m a l i k Core T e s t 12-------O u m a l i k I------------------E a s t Oumalik 1 squareLake I--------------Wolf C r e e k 1 Wolf C r e e k 2 Wolf C r e e k 3 T i t a l u k I------------------K n i f e b l a d e I---------------K n i f e b l a d e 2---------------K n i f e b l a d e 2.4 S k u l l C l i f f C o r e T e s t I----Meade l--------------------S i m p s o n C o r e T e s t I--------S i m p s o n Gore T e s t 2--------S i m p s o n C o r e T e s t 3--------S i m p s o n Core T e s t 4--------S i m p s o n C o r e T e s t 5--------Simpson Core T e s t 6--------S i m p s o n C o r e T e s t 7--------S i m p s o n Core T e s t 8--------S i m p s o n C o r e T e s t 9--------S i m p s o n Core T e s t lo-------S i m p s o n C o r e T e s t 11-------S i m p s o n Core T e s t 12-------S i m p s o n C a r e T e s t 13-------S i m p s o n Core T e s t 14-------S i m p s o n C a r e T e s t 14A------S i m p s o n Core T e s t 15-------S i m p s o n C o r e T e s t 16-------S i m p s o n Core T e s t 17-------S i m p s o n Core T e s t la-------Simpson Core T e s t I?-------S i m p s o n C o r e T e s t 20--------

--------------

--------------

......................

--------------

----------------

---------------------------------------------

9

10

11

12

---13

14

15

I6

W

g b

Simpson C o r e T e s t 22-------Simpson C o r e T e s t 25-------Simpson C o r e T e s t 26-------Simpsan Core T e s t 27-------Simpson C o r e T e s t 28-------Simpson Core T e s t 29-------S i m p s o n C o r e T e s t 30-------Simpson @ r e T e s t 30A------S i m p s o n C o r e T e s t 31-------Minga V e l o c i t y T e s t 1-------

903 1,510 1,171 1,500 2,505 700 693 701 355 1,233 simpsonI------------------7,002 ~ ~ I----------------~ a 1 0 , 5~0 3 E a s t T o p a g o r u k I-----------3,589 * i a t I--------------------6,005 m i a t 2--------------------6,212 Umiat ( C o r e T e s t I ) 3------572 Umiat ( R u b y 1 ) 4-----------840 Umiat ( R u b y 2 ) 5-----------1,077 Umiat ( Ruby 3 ) 6-----------825 m i a t ( R u b y 4 ) 7-----------1,384 m i a t 8--------------------1,327 m i a t 9--------------------1,257 m i a t lo-------------------1,573 u m i a t 11---------.---------3,303 SentinelHillCoreTest1--1,180 cu,,ik I--------------------6,000 c u b i k 2--------------------4,620 ~ ~ I-------------------~ l ~ k 6,952

---

7 3 3 5 17 5 5 5 5 5 17 1~4 17

---

9 9 1 1 3 4 5

----17

--12 12 14

-------------------------~ ----------------------22 9 65 110

---

85 110 85 100 120 85 85 85 110 85

--~-------9 ------30 50 20

----775 ---

1,950 2,220

---

---

---

---

830 200 225 1,020 490 210 210 230 625 25e k 50 90 915 80 60 90 65 220 380 60 6 15 2,040

980 2,150 2,280 2,840 1,060

3,070 3,330 llOe

3,975 4,385 5,205

---

-------

---

-----------

-----

---------------

---

3,080

---

-

---

-------

---

---

---

----A

---

-----

---------------

-------------

-------------

---

-------------

5,290 6,685

5,500 6,885

6,030 8,665

6,270 8,830

---------

-----

---

---

---------------

---

---------------

-------------------------

---

---

-----

---

-----

-----------

---------

--A

---

---------------------------

---

---

---

-----

-----

---------------

---

---------

9,220

9,380

-------

-----------

-----

---

-----

---------

---

---

-------

-----------

---------

-------

---

-----

---

-------

---------

--9,585 -------------------

---------

-----

---

-----

---

---------------------

-----

---

---

-----

---

---

---

---

-----

-----

---

---

---------------------------

---

-----

---------

-------

---

-------

-----

---

-----------

-------

9,775

-------------------

---

-------------

-----------------

---

---

6,535 10,045

-----

-----------------

---

---

---

-----

---

-

--------

Barrow P r o g r a m ( 1 9 5 5 - 8 1 ) S o u t h B a r r o w 5-------------S o u t h B a r r o w 6---4---------S o u t h B a r r o w 7-------------S o u t h B a r r o w 8-------------S o u t h B a r r o w 9 -------------S o u t h B a r r o w lo------------S o u t h B a r r o w 11------------S o u t h B a r r o w 12------------I k o Bay I------------------S o u t h B a r r o w 13------------S o u t h B a r r o w 14------------S o u t h B a r r o w 16------------S o u t h B a r r o w 17------------S o u t h B a r r o w 19------------S o u t h B a r r o w 20------------S o u t h B a r r o w 15------------S o u t h B a r r o w la-------------

lOOe 120 110 lOOe lOOe lOOe lOOe lOOe lOOe lOOe 80e 8Oe 80e 80e 75e 75e 75e

1,920 1,845 1,820 1,850 1,935 1,825 1,765 1,320 1,510 1,705 1,365 1,930 1,410 1,350 1,310 1,480 1,375

Naval P e t r o l e u m R e s e r v e No. 4 P r o g r a m ( 1 9 7 3 - 7 7 )

Cape H a l k e t t I-------------E a s t T e s h e k p u k I-----------S o u t h H a r r i s o n Bay I-------A t i g a r u P o i n t I------------N e s t F i s h C r e e k I----------W.T. €oran L---------------S o u t h Simpson I-------------

9,900 10,664 11,290 11,535 11,427 8,864 8,795

23 22 20 20 21 26 20

lOOe lOOe lOOe lOOe lOOe 1OOe

---

2,220 1,000 2,060 2,420 1,500 2,600

---

3,115 1,585 3,220 3,470 2,550 3,480 8Oe

4,235 3,100 4,220 4,400 3,915 4,380 1,910

7,280 6,850

---

7,280 7,280 7,340 6,315

7,555 7,125 7,290 7,320 7,320

---

6,525

~ a t i o n a lP e t r o l e u m R e s e r v e i n A l a s k a P r o g r a m ( 1 9 7 7 - 8 1 ) u a l a k p a I------------------v e s t D~~~~ I---------------T ~ 1-----------------L ~ w a l a k p a 2------------------N o r t h K a l i k p i k I------------

3,666 4,173 ~ 4,015 ~ 4,360 7,395

19 19 17 ~ 17 21

-------~

---

lOOe

-------

---

1,700

2,395

---

-------

50e 80e lOOe 50e 3,470

1,700 2,910 2,505 2,205 6,895

2,090 3,370 2,955 2,640 7,150

3,220 3,800 3,760 3,845

---

3,260 3,830 3,800 3,885

---

-------

---

---

-------

-----

-----------

-----------

---

-------

---

-----------

3,630 4,005 3,960 4,300

---

GEOLOGY AND EXPLORATION OF THE NATIONAL PETROLEUM RESERVE IN ALASKA, 1974-82

324

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lain by marine shale of the Canning Formation (new name) in the subsurface of the Point Thomson area, east of Prudhoe Bay (fig. 15.1). 7. Pending further study, Tertiary rocks in the northeastern NPRA are assigned to the Sagavanirktok Formation, following the original definition of this formation, whereas Upper Cretaceous rocks are assigned to the Colville Group. The relation of these rocks to the recently proposed nomenclature east of the NPRA (Molenaar and others, 1987) is illustrated in figure 15.1. 8. The (informal) Ugnu sands is a local name used for a partially oilbearing interval, in the subsurface between Prudhoe Bay and the NPRA, exemplified in the British Petroleum East Ugnu No. 1 well between 827 and 994 m (2,716-3,260 ft) measured depth (Werner, 1987). These rocks reportedly span the Cretaceous-Tertiary boundary and, as described herein, are included in the Sagavanirktok Formation (fig. 15.1). 9. The Jago River Formation (new name), named by Buckingham (1987), is a thick (3,000 m, 10,000 ft) section of predominantly nonmarine sandstone, conglomerate, shale, and coal of Late Cretaceous and Early Tertiary age exposed in the foothills of the Brooks Range in the Arctic National Wildlife Refuge. 10. The Canning Formation (new name), named by Molenaar and others (1987), is a thick, predominantly marine shale of Cretaceous and Tertiary age that is present in the coastal plain subsurface east of the NPRA and in outcrops in the foothills of the eastern Brooks Range. The Mikkelsen Tongue (new name) of the Canning Formation, also named by Molenaar and others (1987), is an interval of marine shale and siltstone of Eocene age overlain and underlain by Sagavanirktok Formation in the subsurface of the Point Thomson area, east of Prudhoe Bay (fig. 15.1).

15. NORTH SLOPE STRATIGRAPHIC NOMENCLATURE AND DATA SUMMARY FOR GOVERNMENT-DRILLED WELLS

11. The (informal) Arctic Creek unit, a name introduced by Molenaar and others (1987), is a thick section of complexly deformed shale, bentonitic shale, and turbidite sandstone of Cretaceous age exposed in the foothills of the Brooks Range southeast and east of the Sadlerochit Mountains. 12. The (informal) West Sak sands is a local name used for the sandstone and shale interval in the ARC0 West Sak No. 1well between 1,141 and 1,171 m (3,742-3,842) ft measured depth (Jamison and others, 1980).These rocks are Late Cretaceous in age and, as described herein, are included in the Sagavanirktok Formation (fig. 15.1). 13. The Ignek Formation has been abandoned by Detterman and others (1975, p. 20). 14. The Hue Shale and its distinctive divisions (gamma ray, redweathering, and Inoceramus zones) were named by Molenaar and others (1987) and consist of Cretaceous and lower Tertiary(?) shale, bentonite, and tuff in the coastal plain subsurface east of the NPRA and in outcrops in the foothills of the eastern Brooks Range. 15. Important summaries of terminology and stratigraphic relations for the Nanushuk Group are provided by Ahlbrandt (1979), Huffman (1985), and Molenaar (chapter 25). 16. The Oumalik and Topagoruk Formations of Robinson and others (1956) are now abandoned, and their rocks reassigned to the Torok Formation as proposed by Molenaar (chapter 25). 17. Following the recommendation of Molenaar and others (chapter 12), the Fortress Mountain Formation has been geographically restricted solely to those areas where it occurs in outcrop. 18. The Bathtub Graywacke, named by Detterman and others (1975), is a thick sequence of Lower Cretaceous graywacke sandstone,

conglomerate, and shale exposed along Bathtub Ridge in the eastern Brooks Range. A reference section was proposed by Detterman and others north of the Brooks Range on Sabbath Creek; Buckingham (1987) included this section as part of his Jago River Formation (see note 9). 19. The Okpikruak Formation was geographically restricted by Detterman and others (1975) to the Neocomian flyschlike sequences of rhythmically bedded graywacke, shale, and siltstone in the central and western parts of northern Alaska that are lithologically similar to the unit's type locality on the Okpikruak River (Gryc and others, 1951). The age of this formation has been revised to Late Jurassic and Early Cretaceous (Mayfield and others, chapter 7 ) . Similar flyschlike units that occur in the lowlands between the Lisburne Hills and the western Brooks Range are known as the Kisirnilok, Ogotoruk, and Telavirak Formations (Campbell, 1965a, b, c). The currently accepted ages of the latter two units are Late Jurassic (Imlay and Detterman, 1973). 20. Molenaar and others (1987) proposed raising the rank of the Kemik Sandstone Member (of the Kongakut Formation) to the Kemik Sandstone, but only for the Lower Cretaceous quartzose sandstone that crops out around the Sadlerochit Mountains and as far as 65 km (40 mi) to the southwest and that occurs in wells as far as 110 km (70 mi) to the west (see note 21). Both the Kemik Sandstone and the (thus geographically restricted) Kemik Sandstone Member are Hauterivian in age. Mull (1987) also recommended raising the rank of the Kemik Sandstone Member in the same area. 21. The Kongakut Formation and its members, the siltstone member, pebble shale member, Kemik Sandstone Member, and clay shale mem-

325

ber, were named by Detterman and others (1975) and consist of Lower Cretaceous marine siltstone, shale, and sandstone exposed along Bathtub Ridge in the eastern Brooks Range and in the foothills to the northwest. Because only the Kernik Sandstone Member, pebble shale member, and part of the clay shale member (which is now assigned to the upper part of the Kingak Shale) of this thick formation are present along the mountain front and coastal plain, Molenaar and others (1987) recommended that the name Kongakut Formation not be used along the mountain front and coastal plain, thus geographically restricting its use to the Bathtub Ridge area. 22. The (informal) pebble shale unit is the interval of Lower Cretaceous (Hauterivian and Barremian) marine shale in the NPRA that lies below the Torok Formation and above a regional unconformity. It is characterized by the scattered occurrence of rounded pebbles and sand grains. The uppermost part of the unit is shale characterized by unusually high gamma radiation and is called the gamma-ray zone (GRZ), whereas the base of the unit is locally composed of a thin sandstone, the basal sandstone member (fig. 15.2). East of the NPRA, Molenaar and others (1987)assigned the (informal) GRZ to the Hue Shale (fig. 15.1). 23. The Thomson sand, Put River sand, and Walakpa sandstone are informal names of local usage applied to the basal sandstone member of the pebble shale unit (figs. 15.1, 15.2) in the Point Thomson area (Molenaar and others, 1987), the Prudhoe Bay area (Jamison and others, 1980), and the northern NPRA (Schindler, chapter 2), respectively. These sandstones are discontinuous, of local (northern) derivation, and considered stratigraphic equivalents of the Kemik Sandstone.

15. NORTH SLOPE STRATIGRAPHIC NOMENCLATURE AND DATA SUMMARY FOR GOVERNMENT-DRILLED WELLS

327

TABLE15.5.-Summary of tests for subsurface fluids in Govtzrnment-drilled wells on the North Slope of Alaska-Continued Interval tested (ft)

Test NO.

Test

Results

NO.

Interval tested (ft)

Results

-

N a v a l p e t r o l e u Reserve

N a v a l P e t r o l e u Reserve No. 4 p r o g r a m - - C o n t i n u e d

M. 4 Program--Continued

h i a t I--Continued

Meade 1 - - C o n t i n u e d

DST DST DST DST DST DST DST

03 04 05 06 07 08 09

2,955-3,038 1,101-3,038 1,101-3,038 2,560-2.560 2,690-2,696 2,690-2.696 2,690-2.696

DST DST DST DST

Do. Flowed g a s a t 3 0 1 MCFPD. Flowed g a s a t 1 , 1 3 2 EICFPO. Water-shutoff t e s t . D r i l l i n g f l u i d rose 4 5 0 f t . Water-shutoff t e s t . Packer f a i l e d . Do. S t r o n g b l o w d e c r e a s e d t o f a i n t blow. Swabbing caused gas t o flow intermittently.

05 06 07 08

1,325-1.383 1,325-1,414 1.693-1.816 2,252-2,370

DST 0 1

103-345

DST DST DST DST

389-444 103-444 103-544 755-822

Simpson Core T e s t I t

4-800

DST 0 1

-

~

Bailing recovered a feu g a l l o n s of o i l . Small v o l u m e o f gas f l o w e d f r o m h o l e f o r m o r e t h a n a year.

02 03 04 05

Recovered Recovered Recovered Recovered

7 5 i t o f o i l - c u t mud. mud and a i l - c u t w a t e r . w a t e r and o i l - c u t mud. 1 5 0 f t o f o i l - c u t mud.

Misrun.

Bailed hale dry. Recovered w a t e r w l t h a t r a c e o f o i l and g a s . Recovered mud and o i l - c u t w a t e r . S l l g h t show o f o i l and g a s . Bailed dry. B a i l e d 2 5 g a l o f w a t e r and 1 p i n t o f o i l p e r t r i p . Swabbed b r a c k i s h w a t e r and s m a l l v o l u m e s o f o i l dnd gas.

~

Simpson Core T e s t 2 6

-------

DST 0 1 DST 02 I P 01

3-306 350-895 289-325

Flowed o i l a t 6 0 BPD. B a i l e d w a t e r w i t h a t r a c e o f o i l a t 3 BPD. Flowed o i l a t 1 2 0 BPD a n d g a s a t 3 MCFPD.

---

-

DST 0 1 DST 0 2 IP 01

62-286 62-572 62-572

B a i l e d o i l a t 5 BPD. B a i l e d o i l a t 44-50 BPD. I n i t i a l a i l - p r o d u c t i o n p o t e n t i a l , 1.3-28

BPD.

Simpson Core T e s t 27 h i a t 4 DST 0 1

102-380

----

B a i l e d o i l a t 3 BPD.

----

OST 0 1 DST 0 2

33-354 33-427

I P 01

33-427

B a i l i n g f o r I 5 m i n u t e s p r o d u c e d o i l a t 2 0 0 BPD. B a i l e d o i l a t 7 BPD. F r e e r i n g f o r m a t i o n w a t e r may l i m i t production. Pumping t e s t . Pumped o i l a t 1 4 BPD.

DST 0 1 DST 0 2 DST 0 3 DST 0 4 DST 0 5 DST 06 DST 0 7 I P 01

32-510 32-615 32-615 32-837 771-1,077 32-1,077 32-1.077 335-1,060

B a i l e d o i l a t 7 BPD. B a i l e d o i l a t 103-156 BPD. pumped o i l a t 70 BPD. B a i l e d w a t e r a t 4 8 EPD. R e c o v e r e d d r i l l i n g f l u i d and w a t e r . packer f a i l e d . B a i l e d o i l a t 1 2 1 BPD. Swabbed o i l a t 347-478 BPD. Pumping t e s t . Pumped o i l a t 115-448 BPD.

DST 0 1 DST 0 2

35-528 35-800

Simpson Core T e s t 3 0

-DST 01

5-350

-

~

-

-

B a i l e d o i l a t 6 BPD. ~

Simpson Core T e s t 30A

100-350 100-701

DST 0 1 DST 02

B a i l e d o i l a t 5 BPD. Recovered a s l i g h t v o l m e of B a i l e d t o 701 f t . gas.

---

Simpson Core T e s t 31

--

-

DST 0 1

101-355

Flowed 0 1 1 a t 1 2 5 BPD and g a s a t 4 MCFPD.

Simpson 1

DST 0 1

115-308

DST 0 2 DST 0 3 DST 0 4

115-413 5,954-7,002 5,954-7,002

DST 0 5

5,954-7,002

& c o v e r e d 1-2 q t o f o i l and a Bailed hole dry. s m a l l volume o f g a s . Bailed hole dry. Recovered a b o u t I g a l o f o i l . L i g h t blow. R e c o v e r e d 4 , 0 3 0 f t o f g a s - c u t mud. Recovered 5,471 f t o f f l u i d . Lower 2 , 0 0 0 f t was gas-cut water. Swabbing r e c o v e r e d g a s a t 1 , 0 0 0 MCFPD and s a l t w a t e r a t 4 8 0 BPD.

DST 0 3

35-783

Bailed o i l a t Water-shutoff 1 4 BPD, and Water-shutoff

7 BPD. test.

Pumped o i l a t 3 3 BPD, w a t e r a t

a small v o l m e of gas.

test.

B a i l e d w a t e r a t 5-120 BPD.

Lkniat 7 ~

Topagoruk I

DST 0 1 DST 02

5,960-6,052 6,050-6,162

-

Very s l i g h t blow, then p a c k e r f a i l e d . Moderate blow, d e c r e a s i n g . Recovered 796 f t o f mud.

E a s t Topagoruk I

DST 0 1

2,216-2,254

Weak b l o w . water.

--

01 02 03 04

530-584 679-692 918-1,027 1,213-1,350

Lkniat 8

Recovered 37 f t o f o i l - c u t R e c o v e r e d 1 5 f t o f mud. Packer f a i l e d . Recovered 3 0 i t o f o i l - c u t

mud.

mud.

DST DST DST DST DST DST DST DST DST

01 02 03 04 05 06 07 08 09

--

Water-shutoff t e s t . B a i l e d w a t e r a t 2 BPD. B a i l e d 3 h o u r s and r e c o v e r e d no w a t e r . B a i l e d w a t e r a t 11-40 BPD. B a i l e d o i l a n d w a t e r a t 2 3 BPD. B a i l e d w a t e r a t 23-28 BPD. B a i l e d w a t e r a t 1 9 BPD. Water-shutoff t e s t . B a i l e d w a t e r a t 54 BPD. Water-shutoff t e s t . B a i l e d w a t e r a t 3 BPD. Water-shutoff t e s t . B a i l e d w a t e r a t 8 2 BPD.

01 02 03 04 05 06 07 08 09

R e c o v e r e d 1 , 8 8 0 f t o f g a s - c u t mud and

Lkniat 1

DST DST DST DST

DST DST DST DST DST DST DST DST DST

50-640 50-820 50-838 50-875 50-895 50-905 50-915 50-967 50-1,080

B a i l e d o i l a t 3 BPD. B a i l e d o i l a t 120-144 BPD. B a i l e d o i l a t 1 3 2 BPD. B a i l e d o i l a t 1 2 0 BPD. B a i l e d o i l a t 1 0 4 BPD. B a i l e d o i l a t 72 BPD. B a i l e d o i l a t 72 BPD. B a i l e d o i l a t 8 4 BPD. Swabbed and pumped o i l a t 72 BPD.

GEOLOGY AND EXPLORATION OF THE NATIONAL PETROLEUM RESERVE IN ALASKA, 1974-82 TABLE15.5.-Summary of tests for subsurface fluids in Government-drilled wells on the North Slope of Alaska-Continued Interval tested (ft)

Test NO.

Interval tested (ft)

Test

Results

NO.

Results

--__________________ naval Petroleum Reserve

~ a v a lp e t r o l e m R e s e r v e No. 4 P r o g r a m - - C o n t i n u e d

50-1,327 50-1,327 1,231-1,327

B a i l e d o i l a t 3 6 0 BPD. Flowed o i l a t 6 0 BPD a n d g a s a t 4 4 2 MCFPD. I n i t i a l p r o d u c t i o n p o t e n t i a l , 5 , 8 5 9 MCFPD.

Umiat 9

DST DST DST DST DST DST DST DST DST DST DST DST DST DST DST DST

Swabbing r e c o v e r e d 2 b b l o f mud. Swabbing r e c o v e r e d 3 b b l o f mud. Swabbing r e c o v e r e d 5 b b l o f mud. Pumped g a s - c u t o i l a t 2 4 0 BPD. Swabbed o i l a t 3 0 0 BPD. Swabbed o i l a t 1 6 0 BPD. Swabbed o i l a t 1 3 0 BPD. Swabbed o i l a t 2 8 0 BPD. Swabbed o i l a t 6 2 BPD. Swabbed d r y a n d r e m a i n e d d r y f o r 1 9 h o u r s Swabbed d r y and r e m a i n e d d r y . Swabbing showed no f l u i d e n t e r i n g h o l e . Swabbing p r o d u c e d no f l u i d . Do. DO. Do.

01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16

4 program--Continued

-

G u b i k 2--Continued

Umiat 8 - - C o n t i n u e d

DST 1 0 DST 1 1 I P 01

m.

DST DST DST DST DST DST DST

16 17 18 19 20 21 22

4,034-4,060 4,038-4,060 4,033-4,060 4,039-4,060 4,233-4,261 4,233-49261 4,232-4,261

Packer f a i l e d . Do. Do. R e c o v e r e d 1 2 f t o f w a t e r - c u t mud. Packer f a i l e d . DO. R e c o v e r e d 6 0 f t o f o i l - c u t mud.

Kaalak 1

DST 0 1 DST 0 2

4,799-4,874 4,804-4,874

Misrun. Do.

Barrow Program

South Barrow 5

DST 0 1

2,320-2,325

Flowed g a s t o s u r f a c e a t 4 8 5 MCFPD.

South Barrow 6

Umiat 1 0

-DST DST DST DST DST DST

01 02 03 04 05 06

70-532 70-753 70-980 70-1,095 70-1.124 1,339-1,573

Bailed d r y Bailed o i l Bailed o i l Bailed o i l Bailed o i l Swabbed o i

and r e m a i n e d d r y a f t e r 10.5 h o u r s . a t 9 6 BPD. a t 1 3 0 BPD. a t 2 1 5 BPD. a t 2 9 0 BPD. l a t 1 2 BPD.

Umiat 1 1

DST DST DST UST UST DST DST DST DST DST DST

01 02 03 04 05 06 07 08 09 10 11

512-549 512-549 735-782 792-805 1,325-1,356 2,053-2,097 2,095-2,145 2,375-2,411 2,447-2,461 2,814-2,830 2,832-2,850

Misrun. Recovered Recovered Recovered Recovered Recovered Recovered Recovered Recovered Recovered Recovered

70 f t 50 f t 25 f t 127 f 90 f t 950 f 102 f 1,304 1,944 2,285

o f mud. o f mud. o f mud. t o f mud. o f w a t e r - c u t mud. t o f water. t of water. f t of water. f t of water. f t of water.

Gubik 1

D S T 01

DST 0 2

1,438-1.495 1,438-1.495

DST DST DST UST DST DST

1.681-1.738 3,435-3,519 3,440-3,519 3,488-3.519 3,491-3,608 3,521-3,608

03 04 05 06 07 08

Misrun. Flowed g a s t o s u r f a c e i n 1 3 m i n u t e s . Recovered 120 f t of fluid. Flowed g a s t o s u r f a c e i n s e c o n d s a t 2 , 0 6 0 MCFPD. Packer f a i l e d . DO. Flowed g a s a t 2 , 5 6 1 MCFPD. Packer f a t l e d . Flowed g a s a t 8 2 3 HCFPD.

DST 0 1

2,276-2.343

Flowed g a s a t 3 , 0 0 0 PLCFPD.

R e c o v e r e d 2 0 f t o f mud.

South Barrow 7

DST 0 1

2,178-2,317

01

2,238-2,351

IP

Water-shutoff t e s t . Flowed g a s t o s u r f a c e i n 5 minutes. R e c o v e r e d 1 9 0 f t o f mud. I n i t i a l p r o d u c t i o n p o t e n t i a l , 8 8 0 MCPFD ( c a l c u l a t e d a b s o l u t e open flow measured w i t h q u e s t i o n a b l y calibrated gage).

South Barrow 8

--

IP

01

2,261-2,359

---

I n i t i a l p r o d u c t i o n p o t e n t i a l , 9 3 8 MCFPD ( c a l c u l a t e d a b s o l u t e open flow).

South Barrow 9

DST DST DST IP

01 1A 02 01

1,995-2.130 2,040-2,130 2,338-2,449 2,384-2,450 ~

Packer f a i l e d . Flowed g a s t o s u r f a c e i n 2 5 m l n u t e s a t 1 2 5 MCFPD. Flowed g a s t o s u r f a c e i n 2 m i n u t e s a t 2 , 0 0 0 MCFPD. I n i t i a l p r o d u c t i o n p o t e n t i a l , 4 , 9 0 0 MCFPD ( c a l c u l a t e d a b s o l u t e open flow). ----

s o u t h Barrow 10

DST 0 1 -DST 0 2

2,250-2.290 2,250-2,349

Very weak b l o w . R e c o v e r e d 6 f t o f mud. Flowed g a s t o s u r f a c e i n I m i n u t e . Recovered 2 f t o f mud.

Gubik 2 South Barrow I 1 ~-

DST DST DST DST DST DST DST DST

01 02 03 04 05 06 07 08

DST 0 9 DST DST DST DST DST DST

10 11 12 13 14 15

1,145-1,201 1,308-1,351 1,355-1,402

R e c o v e r e d 2 0 0 f t o f mud. R e c o v e r e d 1 7 5 f t o f g a s and w a t e r - c u t mud. Recovered 4 9 7 f t o f g a s - c u t w a t e r . Recovered 500 f t o f w a t e r . R e c o v e r e d 1 1 5 f t o f mud. R e c o v e r e d 1 1 3 f t o f mud. Flowed g a s a t 8 , 0 0 0 MCFPD. Flowed g a s a r u n d e t e r m i n e d r a t e b e c a u s e o f f r o z e n lines. R e c o v e r e d 7 g a l o f o i l y , g a s s y w a t e r and t o o s m a l l a v o l m e of gas t o measure. R e c o v e r e d 400 f t o f o i l y , g a s s y , w a t e r - c u t mud. Packer f a i l e d . DO. Recovered 195 f t o f w a t e r - c u t vud. Recovered 1 , 9 1 0 f t o f w a t e r . R e c o v e r e d 1 0 f t of w a t e r - c u t mud.

DST 0 1

2,185-2.350

Flowed g a s t o s u r f a c e i n 2 m i n u t e s a t u n r e p o r t e d rate.

South Barrow 12

DST 0 1

1,885-1,985

DST 0 2 DST 0 3 DST 0 4

1,985-2,101 1,946-2,101 2,100-2,250

DST 0 5 DST 0 6

2,192-1,285 2,008-2,088

Weak b l o w decreasing t o v e r y weak. Flowed g a s t o s u r f a c e i n 22 minutes. Recovery t o o s m a l l t o measure. Packer f a i l e d . Do. Flowed g a s t o s u r f a c e i n 2 0 m i n u t e s . Recovered 950 l g a s - c u t muddy s a l t w a t e r . f t o f u ~ and Ih d n t a . Flowed g a s s t r a t e t o o s m a l l t o m e a s u r e .

15. NORTH SLOPE STRATIGRAPHIC NOMENCLATURE AND DATA SUMMARY FOR GOVERNMENT-DRILLED WELLS

329

TABLE15.5.-Summary of tests for subsurface fluids in Gout:rnment-drilled wells on the North Slope of Alnskn-Continued Test NO.

Interval tested (ft)

Test

Results

NO.

Barrow Program--Continued

Interval te~ted (ft)

Results

N a t i o n a l P e t r o l e m Beserve i n Alaska P r o g r a m - - C o n t i n u e d

I k o Bay 1

DST 0 1

2,541-2,731

S o u t h Simpson 1

R e c o v e r e d 9 0 f t o f mud and 1 i t o f o i l .

DST 0 1 DST 0 2

6,522-6,568 6,183-6,241

DST 0 3

5,807-5,946

South Barrow 14

DST 0 1 I P 01

1,947-2,100 1,947-2.130

Flowed g a s a t 2 , 4 0 0 MCFPD. I n i t i a l p r o d u c t i o n p o t e n t i a l , 3 , 7 0 0 MCFPD ( c a l c u l a t e d a b s o l u t e open f l o w ) .

South Barrow 17

DST 0 1

1,512-1,715

DST 0 2 DST 0 3

2,105-2,147 2,212-2,322

DST 0 4

2,212-2,345

IP

01

2,101-2,127

Flowed g a s t o s u r f a c e i n 1 0 m i n u t e s a t 7 5 MCFPD. & c o v e r e d 5 0 0 f t o f w a t e r c u s h i o n and 7 5 0 f t o f w a t e r - c u t mud. Sample c h a m b e r r e c o v e r e d g a s - c u t mud w i t h a n o i l s h e e n . R e c o v e r e d 4 b b l o f mud a n d 5 0 0 f t o f w a t e r c u s h ion. Sample c h a m b e r r e c o v e r e d mud.

Flowed g a s t o s u r f a c e i n 1 . 5 h o u r s a t r a t e t o o s m a l l t o measure. Flowed g a s a t 1 , 0 9 0 MCFPD. Flowed g a s t o s u r f a c e i n 2 5 m i n u t e s . R e c o v e r e d 24 b b l o f g a s and o i l - c u t mud. Recovered 24 b b l Flowed g a s t o s u r f a c e i n 2 h o u r s . o f g a s and o i l - c u t mud. I n i t i a l p r o d u c t i o n p o t e n t i a l , 6 , 5 0 0 MCFPD ( c a l c u l a t e d a b s o l u t e open flow).

Walakpa 1

DST 01

2,063-2,120

DST 02

2,073-2,088

Flowed g a s t o s u r f a c e i n 1 4 m i n u t e s a t 200-854 MCFPD. R e p o r t e d p r e s s u r e and r a t e s u n r e l i a b l e b e c a u s e o f f r e e z i n g and thawing o f f l o w l i n e . Flowed g a s t o s u r f a c e i n 1 4 m i n u t e s a t 3 3 5 MCFPD.

West Dease 1 ~

DST 0 1

3,699-3,730

-

-

-

~

R e c o v e r e d 0.69

b b l o f mud and o i l .

Tulageak 1 S o u t h B a r r o w 19 DST 0 1 DST 0 1 I P 01

2,161-2,243 2,018-2,044

South Barrow 20

DST 0 1

2,127-2,314

IP

1,994-2,082

01

3,770-3,825

Flowed g a s t o s u r f a c e i n 2 3 m i n u t e s a t 8 0 0 MCFPD. I n i t i a l p r o d u c t i o n p o t e n t i a l , 7 , 2 2 0 MCFPD ( c a l c u l a t e d a b s o l u t e open flow). R e c o v e r e d 2.6 b b l o f g a s - and v a t e r - c u t o i l .

Flowed g a s t o s u r f a c e i n 1 h o u r a t 1 2 MCFPD. Rec o v e r e d 2.6 b b l o f g a s - and w a t e r - c u t o i l . RecovI n i t i a l p r o d u c t i o n p o t e n t i a l , 1 , 3 0 0 MCFPD. ered I b b l of water.

R e c o v e r e d 5 3 0 f t o f w a t e r c u s h i o n and 6 2 0 f t o f s a l t w a t e r - c u t mud. P o s s i b l e p a r t i a l plugging d u r i n g f l o w and p o s s i b l e l e a k a g e d u r i n g s h u t - i n .

Walakpa 2

DST 0 1 DST 0 2

2,564-2,720 2,606-2,634

IP

2,606-2,634

01

Misrun. Flowed g a s t o s u r f a c e i n 8 m i n u t e s a t 3 6 9 - 2 , 2 9 3 MCFPD a n d v a r y i n g p r e s s u r e c a u s e d b y f o r m a t i o n o f h y d r a t e s and l e a k i n p r o d u c t i o n t u b i n g . I n i t i a l p r o d u c t i o n p o t e n t i a l , 2 , 2 0 0 MCFPD.

North I n i g o k 1 -- - -- - --- -

South Barrow I S

DST 0 1 DST 0 1 DST 0 2

2,080-2,136 2,095-2,136

DST 0 3 DST 0 4 I ? 01

2,105-2,136 2,188-2.278 2,054-2,051

Packer f a i l e d . Moderate blow i n c r e a s i n g t o s t r o n g . Packer f a i l e d a f t e r 20 m i n u t e s . Flowed g a s t o s u r f a c e i n 4 m i n u t e s a t 500 MCFPD. Recovered 2,090 f t o f w a t e r . I n i t i a l p r o d u c t i o n p o t e n t i a l , 1 , 0 0 0 HCFPD. -

01

2,056-2,076

-

~

Flowed g a s t o s u r f a c e i n 5 2 m i n u t e s a t 8 0 MCFPD. Surface pressure declined.

Lisburne 1

DST 0 1

11,618-11,941

DST 0 2 DST 0 3

7,645-7,662 7,645-7,662

DST 0 4

7,022-7,104

--

South Barrow 1 8

IP

8,257-8,360

I n i t i a l p r o d u c t i o n p o t e n t i a l , 1 , 3 7 0 MCFPD.

Weak b l o w . R e c o v e r e d 3 0 0 f t o f w a t e r c u s h i o n and 2 , 1 0 0 f t o f mud f i l t r a t e . Sample c h a m b e r r e c o v e r e d g a s and mud f i l t r a t e . R e c o v e r e d 1 1 0 f t o f mud. Tool plugged. R e c o v e r e d 1 0 b b l o f mud and 6 1 b b l o f w a t e r . Sample chamber r e c o v e r e d s o u r g a s and f o r m a t i o n water. Flowed g a s t o s u r f a c e i n 2 8 m i n u t e s a t 2 1 3 MCFPD and d e c l i n i n g p r e s s u r e .

N a t i o n a l P e t r o l e m Reserve i n A l a s k a P r o g r a m

S o u t h H a r r i s o n Bay 1

DST 01 DST 02

7,119-7,207 7,120-7,290

DST 0 3

5,680-5,790

R e c o v e r e d volume o f w a t e r t o o s m a l l t o m e a s u r e . R e c o v e r e d w a t e r and mud. Sample c h a m b e r r e c o v e r e d mud. Recovered volume o f g a s t o o s m a l l t o measure. Sample c h a m b e r r e c o v e r e d s l i g h t l y g a s c u t mud, g a s , and a t r a c e o f d e a d o i l .

---- --- -------DST 0 1

7,587-7.676

DST 02 DST 0 3

8,205-8,253 8,206-8,283

DST 0 4

7,512-7,520

Awuna I

W.T.

Foran 1

-- -----.--

----

Flowed w a t e r t o s u r f a c e i n 78 m i n u t e s . Recovered Sample 364 f t o f w a t e r and 1 , 1 0 7 f t o f mud. c h a m b e r r e c o v e r e d g a s and w a t e r . Misrun. R e c o v e r e d 3 , 3 1 3 S t o f w a t e r , 2 , 0 4 4 S t o f mud, and Sample c h a m b e r r e 6 2 8 Et o f f o r m a t i o n w a t e r . c o v e r e d g a s , o i l , and w a t e r . Flowed s a l t w a t e r t o s u r f a c e i n 1 1 7 m i n u t e s a t 9 6 BPD. Sample c h a m b e r r e c o v e r e d g a s a n d a t r a c e o f o i l and w a t e r .

DST 0 1

8,297-8.412

Flowed s a l t w a t e r t o s u r f a c e I n 6 5 m i n u t e s a t 2 , 0 5 7 BPD.

Drew P o i n t 1

DST 0 1 DST 02 DST 0 3

5,850-5,922 7,412-7.572 7,765-7.821

Weak b l o w . R e c o v e r e d 6 3 f t o f muddy w a t e r . Weak b l o w . X e c o v e r e d 1 1 0 f t o f muddy w a t e r . Sample c h a m b e r r e c o v e r e d muddy w a t e r . No r e c o v e r y from t e s t s t r i n g .

Ikpikpuk 1

DST 0 1

7,446-7,472

DST 0 2

6,877-6,923

Weak b l o w i n c r e a s i n g t o s t r o n g . Recovered 1 , 3 1 8 f t o f & a s - c u t mud. Flowed gas t o s u r f a c e i n 5 0 m i n u t e s a t r a t e t o o small t o measure.

330

GEOLOGY AND EXPLORATION OF THE NATIONAL PETROLEUM RESERVE IN ALASKA, 1974-82 TABLE 15.5.-Summary of tests for subsurface fluids in Government-drilled wells on the North Slope of Alaska-Continued

Test NO.

Interval tested (it)

Results

--

N a t i o n a l P e t r o l e m Reserve i n Alaska Program--Continued

J.W.

DST 01 DST 0 2

7,812-8,140 8,568-8,665

DST 0 3

8,482-8,538

DST 0 4

8,3924,436

DST 0 5

7,971-7,976

Dalton 1

Flowed muddy w a t e r w i t h an o i l s h e e n a t 1 , 2 1 8 BPD. Recovered s m a l l v o l u n e o f Medium t o s t r o n g b l o w . g a s , 5 bbl o f a s p h a l t , 3.3 bbl o f water cushion, 2 9 b b l o f mud f i l t r a t e , and 8 0 b b l o f s a l t w a t e r . Moderate t o s t r o n g b l o w . Recovered 5 b b l of a s p h a l t , 6 . 8 b b l o f w a t e r y mud, and 2 2 b b l o f o i l y water.

Recovered 7 . 5 b b l o f w a t e r c u s h i o n and mud w i t h an o i l sheen. Flowed g a s t o s u r f a c e i n 1 6 5 m i n u t e s and w a t e r a t 258 BPD.

East Slmpson 2

DST 01

7,165-7,197

Flowed g a s a t r a t e t o o s m a l l t o m e a s u r e and s a l t w a t e r w i t h a t r a c e o f o i l a t 9 6 0 BPD d e c l i n i n g t o 576 BPD.

DST 0 1 DST 0 2 DST 0 3

5,340-5,388 5,310-5,402 5.366-5.394

DST 0 4

2,652-2,664

Misrun. Packer f a i l e d . Flowed g a s a t 4 , 0 0 0 - 6 , 7 0 0 HCFPD w i t h v a r i o u s c h o k e s i z e s a t d e c l i n i n g r a t e s and p r e s s u r e s . Flowed g a s t o s u r f a c e i n 9 m i n u t e s a t r a t e t o o s m a l l t o measure.

24. The Ugnuravik Group, (informal) highly radioactive zone (HRZ), Miluveach Formation, and Kalubik Formation are names proposed by Carman and Hardwick (1983) for Cretaceous strata immediately overlying and underlying the Kuparuk Formation (see note 25). 25. The name K u p d Formation of Carman and Hardwick (1983) is herein adopted as the formal name of that interval of Lower Cretaceous (Neocomian) sandstone and shale overlying the Kingak Shale and underlying a regional unconformity. The type section is the interval between 1,795 and 1,909 m (5,8906,262 ft) in the Ugnu State No. 1 well located in the Beechey Point quadrangle in sec. 22, T. 12 N., R. 9 E. The brevity of the name Kuparuk Formation is preferable to the longer names also applied to the same interval, namely the Kuparuk River Formation (Jamison

and others, 1980) or (informal) Kuparuk River sands of local usage (North Slope Stratigraphic Committee, 1970). As illustrated by Carman and Hardwick (1983, fig. 7), the Kuparuk Formation in the Ugnu well is more complete than in the North Kuparuk State No. 1 well, the type section originally proposed by the North Slope Stratigraphic Committee (1970). 26. The Ipewik unit and Tingmerkpuk subunit are informal names used by Crane and Wiggins (1976) for Jurassic and Lower Cretaceous rocks that crop out in the western Brooks Range and foothills. See Molenaar (chapter 25) for an interpretation of the regional setting of these units. 27. The Kingak Shale has been revised (Molenaar, chapter 25) to include Lower Cretaceous (Neocomian) strata below the pebble shale unit in the NPRA and else-

where on the North Slope. 28. The Simpson sandstone is an informal name of local usage for a Middle or Upper Jurassic glauconitic sandstone interval within the Kingak Shale in the north-central NPRA. The sandstone is identified as that interval in the Kugrua, Peard, South Meade, and Topagoruk wells that correlates with the sandstone interval between 1,989 and 2,044 m (6,525-6,705 ft) in South Simpson No. 1well. 29. The Barrow sandstone is an informal name of local usage for a highly bioturbated silty sandstone interval of Early Jurassic age near the base of the Kingak Shale in the northern NPRA. Gas accumulations in this sandstone near Barrow were described by Lantz (1981). 30. The Tiglukpuk Formation was abandoned by Imlay and Detterman (1973), following the recommendation of Jones and Grantz (1964). 31. The Sag River Sandstone was adopted for the U.S. Geological Survey by Reiser (1970) (following definition of the North Slope Stratigraphic Committee, 1970).The Sag River Formation is a name proposed by Jones and Speers (1976). 32. The Karen Creek Sandstone, an approximate stratigraphic correlate of the Sag River Sandstone, was named by Dettennan and others (1975) and consists of a resistant interval of sandstone and siltstone cropping out in northeastern Alaska. 33. The Etivluk Group, Otuk Formation, Blankenship Member (of Otuk Formation), and Kuna Formation are names proposed by Mull and others (1982)for rocks cropping out in the central and western Brooks Range. The Siksikpuk Formation, which was named by Patton (1957), is included in the Etivluk Group. 34. New information on the age and structural interpretation of the Nuka Formation was provided by Tailleur and others (1973).

15. NORTH SLOPE STRATIGRAPHIC NOMENCLATURE AND DATA SUMMARY FOR GOVERNMENT-DRILLED WELLS

35. The Sadlerochit Group with its various formations and members (table 15.1) consists of units either revised in rank or newly proposed by Detterman and others (1975)for rocks that crop out in northeastern Alaska. Shortly after their publication, Jones and Speers (1976) proposed a slightly different nomenclature for these same rocks in the subsurface of the Prudhoe Bay area. In the latter scheme, some of the members of Detterman and others' Ivishak Formation are elevated to formation rank (Fire Creek Siltstone and Kavik Shale), and Ivishak Sandstone (formational rank) is used instead of Ledge Sandstone Member.

36. Paleontologic study of the Lisburne Group in several NPRA wells (South Harrison Bay No. 1, Inigok No. 1, Ikpikpuk No. 1, Kugrua No. 1, and Tunalik No. 1) indicates that this group apparently is as young as Early Permian (Bird, 1978; Witmer and others, 1981). This age determination is based on occurrence of nodosariid foraminifers whose earliest appearance in the fossil record is Early Permian (B.L. Mamet, written commun., 1982). 37. The upper limestone, lower limestone, and dolomite units are informal names used by Bird and Jordan (1977) for subdivisions of the Lisburne Group in the subsurface

' Sagavanirktok Fm, and Colvllle Gp . undv~ded 3Colv~lleGroup 'Sandstone of Colville Group

331

of the Prudhoe Bay area. 38. The age of the Kogruk Formation in the Lisburne Hills has been revised to range upward into the Early Pennsylvanian (Dutro, 1987). 39. The upper part (post-Kanayut Conglomerate) of the Endicott Group is mostly a clastic-facies equivalent of the Lisburne Group, a carbonate unit. Because the Lisburne Group is known to range in age to as young as Permian in the northern NPRA, the Endicott Group in this area may likewise be as young as Permian. 40. The Itkilyariak Formation, named by Mull and Mangus (1972), is essentially a red-colored facies

Sandstone of Colville Gp. and Sagavanirktok Fm , und~v~ded Shale of Colv~lleGroup

FIGURE 15.1.-Generalized time-stratigraphic cross section of Cretaceous and Tertiary rocks along coastal plain of central North Slope of Alaska, based on data from 14 wells and illustrating stratigraphic nomenclature. Series and stage boundaries are approximate; numerical time scale modified from Palmer (1983).Strata removed

Unt of local usage

by unconformities have not been restored; time span of Eocene unconformity is poorly controlled. Location of wells shown in inset; refer to well-correlation section by Molenaar and others (1986) for identificationof wells. Quaternary surficial deposits and Gubik Formation of Pliocene to Holocene age are not shown.

332

-

GEOLOGY AND EXPLORATION OF THE NATIONAL PETROLEUM RESERVE IN ALASKA, 1974-82

GAMMA-RAY INTENSITY 0 200API units

RESISTIVITY 2000 Q .rn

that is equivalent to the Kayak Shale and that occurs mostly in the subsurface of the Prudhoe Bay area. 41. The Kanayut Conglomerate has been stratigraphically restricted, its Stuver Member has been stratigraphically extended, and two new members have been named by Nilsen and Moore (1984). The new members, which lie beneath the Stuver Member, are the Shainin Lake Member and the Ear Peak

o

u

-----, ...............

.............. ............... .............. ............ ............... .............. ............... ............ .............. ............... ------

-------------.-------6000 -==-=-=-=-
-Cont i n v e d

dnta for Government-dn'lled wells on the North Slope of dl&-Continued Interval attempted (ft)

Core recovered (ft)

Pebble s h a l e u n l t . K i n g a k Shale. S h u b l i k FormatLon. Ledge S a n d s t o n e nember o f t h e I v i s h a k Formation. DO. K a v l k Member of the I v i s h a k Foxmation. L i s b u r n e Group. DO. E n d i c o t t Group. Basement complex.

Do. Do. Klngak Shale. DO.

K i n g a k S h a l e a n d Sag R i v e r Sandstone, undivided. Sag R i v e r S a n d s t o n e . Shublik Formation.

Do.

.

S h u b l i k F o r m a t i o n a n d Ledge S a n d s t o n e Member o f t h e I v i s h a k Formation, undivided. Ledge S a n d s t o n e Member o f the Ivishak Formation.

Do. DO.

Do. Argillite.

Nanushuk Group.

Do. I o r o k Formation. DO.

10.6 0 0 10 60 24 10 58.2

E a s t S i m p s o n 2--Continued

7.197-7.227 7,248-7.278 7,293-7,346 7,424-7.458

28 30 53 32.8

5,390-5,402 6,541-6,551 10,068-10,098 10,870-10,884 12,011-12,041 13,207-13,236 14,577-14,607

12 7.3 29.5 14 30 27.6 27.6

7,564-7,593

28

7,729-7.739

8

Nanushuk Group. Torok Formation. DO.

Do. DO.

DO. Argillite.

Torok Formatton. DO. Do.

Do. Do. Klngak Shale. Do.

Nanushuk Group. DO. DO. T o r o k Format i o n .

DO.

Sag R l v e r S a n d r r o n s . Do. S h u b l i k Formation. Ledge S a n d s t o n e Hember o f the Ivishak Formation. Ledge S a n d s t o n e Member o f the I v i s h a k Formation and basement c a a p l e x . undlvided Basement complex

DO. DO. DO. Pebble s h a l e u n i t . ~ i n g a kS h a l e .

.

DO.

~ i n g a kS h a l e . DO.

J.W.

DO.

DO. Do. Shublik Formation. F i r e C r e e k S i l t s t o n e Member of t h e I v i s h a k Formation.

27 30 27 4.3 8.6 54

Do.

49 45.5 30 12.8 30 10.5 1.92

Continued

Tunalik 1 2,674-2.685 3,739-3,749 3,749-3,759 5,120-5,130 6,810-6.870 6,898-6.922 7,426-7,436 7,463-7,523

DO.

Do.

Rock u n ~ t

naval P e t r o l e l l Reserve i n A l a s k a Program (1977-81)-

DO.

Inigok I

13,831-13,880 14,020-14,066 15,185-15,215 16.185-16.198 17,053-17,083 19,360-19.372 20,091-20,102

Core recovered (it)

East Simpeon 1

Do. 23 22 18.5

Interval attempted (it)

Ikpikpuk I--Continued

Torok Formation.

,

b c k unrt

n a v a l P e t r o l e u reserve i n A l a s k a program ( 1 9 7 7 - e l ) - Continued

Drew P o i n t 1

7,704-7.733 7,793-7,821 7,882-7,901

353

K a v i k Member o f t h e ~ v i s h a k Formation. Echaoka F o r m a t i o n . L i s b u r n e Group. DO. Do. Do. E n d l c o t t Group. Do.

55 13.5 26.5 59 24.9 28.1 8.5

DO.

Dalton I

Nanushuk Group. Torok Formation. DO.

16,929-16,959 17,134-17,149 17,255-17,286 17,858-17,888

21 11.5 28 30

DO. F i r e C r e e k S i l t s t o n e Member of t h e I v l s h a k Formation. Do. K a v i k Member of t h e I v i s h a k Formation. Echooka Formation. L ~ s b u r n eGroup. Do. DO.

DO.

Pebble s h a l e u n i t . Ledge S a n d s t o n e Member o f the Ivlshak Formation. DO. Do.

Do. DO. L i s b u r n e Group. Do. Argillite.

Peard 1

Torok Formation. DO. DO.

DO. DO.

pebble shale unit. ~ i n g a kS h a l e . DO.

Ikpikpuk 1

2,930-2.960

30

3,784-3.812 5,690-5,700 7.132-7.143

28 10 11

Nanushuk Group a n d Torok Format i o n , u n d i v i d e d . Tarok Formation. Do. Do.

Sag Rlver S a n d s t o n e and S h u b l i k Formation, undiv ided Ledge S a n d s t o n e Member o f t h e 1vlshe.k F o r r a t i o n . Echooka F o r m a t i o n . Basement c o m p l e x .

.

2,380-2.410 6,056-6,086 6,340-6.370 6,705-6.735 7,167-7,197

30 27.5 30 30 29

Nanvshuk Group. Torok Formation. P e b b l e s h a l e unlc. Sag R l v e r S a n d s t o n e . E n d l c o r r Group.