ConocoPhillips Devils Paw Prospect, Chukchi Sea: A ... 2014 Newsletter.pdf · Volume 44 Number 7 March 2014 Page 1 ConocoPhillips Devils Paw Prospect, Chukchi Sea: A Beaufortian Play

Volume 44 Number 7 March 2014 Page 1

ConocoPhillips Devils Paw Prospect, Chukchi Sea: A Beaufortian Play Analogous to the Kuparuk River

Field, North Slope Alaska

Gregory C. Wilson1 Chris Seaman2

Kent Smith3 1ConocoPhillips Alaska, Inc., Anchorage, AK 2ConocoPhillips Norway; Stavanger, Norway

3ConocoPhillips; Retired

[email protected]

The Devils Paw prospect is a large four-way dip closure at the Beaufortian primary objective in the Lower Cretaceous, with nearly 1000 feet of structural relief covering approximately 275,000 acres. Leases over the prospect were obtained in 2008 by competitive bid in Sale 193. The structure was penetrated by the Shell Klondike 1 well in 1989 on its way to a deeper objective, encountering a thin hydrocarbon-charged reservoir in the Lower Cretaceous at a position high on paleo-structure. ConocoPhillips and co-owners Statoil and OOGC have selected drill locations interpreted to be more favorable to thick Lower Cretaceous reservoir development, but drilling plans are currently on hold.

Phanerozoic stratigraphy in the Chukchi Sea includes Ellesmerian, Beaufortian, and Brookian mega-sequences correlative to that of Alaska’s North Slope. Hydrocarbon-charged reservoir facies within the Beaufortian and Brookian mega-sequences, and source facies within the Ellesmerian mega-sequence, were encountered during the drilling of the five wells in the Chukchi Sea from 1989 - 1991. (continued)

AGS Luncheon Date & Time: March 20h, 11:30 am – 1:00 pm

Program: ConocoPhillips Devils Paw Prospect, Chukchi Sea: A Beaufortian Play Analogous to the Kuparuk River Field, North Slope Alaska

Speaker: Greg Wilson, ConocoPhillips Alaska, Inc., Anchorage, AK

Place: BP Energy Center

Reservations: Make your reservation before noon Tuesday, March 18th, 2014

Cost: Seminar only, no meal: Free Reserve a box lunch: $15 Lunch with no reservation: On an “as-available” basis only

E-mail reservations: [email protected] or phone (907) 564-4028. For more information visit: www.alaskageology.org


About the Speaker:

Greg Wilson is currently Director of Arctic Exploration for ConocoPhillips Alaska. He has over 23 years of oil and gas exploration experience in Alaska with ConocoPhillips and herit-age companies, ARCO and Phillips, during which time he never had to work directly with Bob Swenson. From 2000 to 2009 Greg worked as project geologist for many of the explo-ration wells drilled In the NPR-A, including discoveries now on their way to development. For an exploration geologist, few things were as gratifying as an active drilling program in the winter and a field program in the summer. During this time Greg conducted tours for

many US Senators, a Secretary of the Interior, National Directors of the BLM, and a White House panel on energy – always promoting responsible exploration of Alaska’s North Slope.

Greg has been an active member in the Alaska Geological Society, including serving as President, Vice-President, and for eight years Newsletter Editor. In addition, he co-chaired the 2006 Joint AAPG-GSA-SPE Convention and the 2008 “Prudhoe at 40” Technical Conference. He has received a Distinguished Service Award from the Pacific Section of AAPG in 2011. Greg was an adjunct lecturer at Alaska Pacific University for five years. His PhD in Geology is from the University of Wisconsin-Madison.

The primary objective at Devils Paw is a combined regressive-transgressive stratigraphic assemblage at about 9000 feet crestal depth within the Beaufortian Mega-sequence, roughly equivalent to the shallow ma-rine Lower Cretaceous Kuparuk A and C sands of the Kuparuk River Field, onshore Alaska.

The prospect is covered by a 3D seismic survey acquired in 2007 and multiple vintages of 2D seismic da-ta. Although of relatively low frequency, the 3D seismic data is sufficient to define the structural closure as well as stratal geometries of the objective interval. Along a south-to-north seismic section these stratal geom-etries include a lower, northward prograding succession subtly truncated below a transgressive, southward-onlapping succession. The paleostructural high, interpreted from truncations of the prograding succession, is located south of the present-day structural high. The Klondike 1 well penetrated the Lower Cretaceous inter-val near this paleostructural high, revealing a thin sharp-based glauconitic sandstone interpreted to be a transgressive sandstone at the base of the onlapping succession. Post-depositional compressional inversion has shifted the structural crest northward. ConocoPhillips plans to drill north of the paleostructural high, in an area with preservation of a thick prograding succession not present in Klondike 1 and higher accommodation space for the upper onlapping succession present in Klondike 1 as a thin transgressive sandstone.

From the President’s Desk:

Although the calendar says it’s early in the year the AGS has only a few more newsletters to go before summer break. Even so there’s no relaxing as we’re heading into a busy part of the year with the Spring Tech conference coming up in May and a jam packed talk schedule in April. Hopefully the membership finds the AGS a useful resource. Another year end event for the AGS is our annual election. Please consider par-ticipating as a board member, director or committee member. Talk to anyone of the folks listed on the back page of the newsletter if you’re interested or want to know more about where our needs are.

On the theme of volunteerism I’d like to give a hearty thanks to the Scholarship Committee chair, Sue Karl, and the other committee members for a great effort this year. Sue had the added task of coordinating with the Pacific Section AAPG to obtain extra funding through a scholarship program they manage. Navigating the rules and regulations is always a challenge whether governmental, academic or private industry and she’s done a fine job. It’s not quite over yet but we have a fine list of students attending Alaska schools as well as a few folks doing projects here in the state to help support.

~ Matt


THE ALASKA GEOLOGICAL SOCIETY

2013-2014 Season Luncheon Program. Updates on the web at: http://www.alaskageology.org

Thursday, August 22, 2013 James McCalpin, Geo-Haz; The Mountains Are Falling Apart; A Spectrum of Mass Failures; Rockslides, Sackungs and Unfolding

Thursday, September 19, 2013 Sue Karl, USGS; Quaternary Volcanoes in Southeast Alaska

Thursday, October 17, 2013 Erin E. Donaghy, Northen Arizona Univ.; South-Central Alaska: Modification of a Forearc Basin by Spreadng Ridge Subduction

Thursday, November 21, 2013 John Decker, Niko Resources; Seabed mapping and the search for oil and gas seeps offshore

Thursday, December 12, 2013 Leo Brown, COP & Daniel Yancey, BP, “4D Seismic at Alpine Field & Time-lapse 3D/4D observations at Simpson Lagoon, Milne Pt.”

Thursday, January 16, 2014 Richard O. Lease, USGS; Thrust belt propagation, canyon incision and hydrocarbon systems in the Central Andes

Thursday, February 20, 2014 David Houseknecht, USGS, “Alaska’s North Slope and the Chukchi Shelf”

Thursday, March 20, 2014 Greg Wilson, ConocoPhillips Alaska, “Devil’s Paw Prospect, Chukchi Sea, Alaska”

Friday, April 11, 2014 Allison Thurmond, Statoil (AAPG Distinguished Lecturer), “Industry-Driven Advances in Predictive Earth Systems modelling” (Evening meeting; 6:00 pm, BP Energy Center)

Monday, April 14, 2014 John Kaldi, University of Adelaide, “Carbon Capture and Storage”, Main Conference Rooms A, B, C at BP Exploration Alaska

Thursday, May 15, 2014 Keynote Speaker at the AGS Technical Conference, University of Alaska. Anchorage

If you would like to volunteer a talk or would like to suggest a speaker, please contact Monte Mabry at 230-4488.


ALASKA FOSSILS OF THE MONTH Ordovician Carbonate Facies of Prince of Wales Island, Southeast Alaska

by David M. Rohr1, Susan M. Karl2, Robert B. Blodgett3, James F. Baichtal4, and Elizabeth A. Measures1

1 Sul Ross State University, Alpine, TX 79832 2 USGS, 4210 University Dr., Anchorage, AK 99508-4626 3 Geological Consultant, 2821 Kingfisher Drive, Anchorage, AK 99502 4 U.S. Forest Service, Tongass National Forest, Thorne Bay, AK 99919

Paleozoic rocks on Prince of Wales Island (figs. 1 & 2) make up part of the Alexander terrane, a major accreted block within the accretionary collage that comprises much of western North America (Berg et al. 1972, 1978; Coney et al. 1980; Monger & Berg 1987; Gehrels & Berg 1994; Blodgett et al. 2010) It is widely recognized that the Alexander terrane has been transported and accreted from some distant source area, and previously suggested areas for its origin include the Klamath Mountains and northern Sierra Nevada Mountains of California, the Lachlan Fold Belt of eastern Australia and Baltica or the area of the Uralian geosyncline (see Blodgett et al. 2010, for review of these models). More recently, Blodgett et al. (2002, 2010) suggested that the Alexander terrane most likely originated by rifting from northeastern Rus-sia. Very thick (1500 m) Silurian limestone and dolomite units occur in the Alexander terrane (Heceta, Kennel Creek and Willoughby formations). The underlying Ordovician rocks of the Descon Formation, however, contain only scattered ex-posures of limestone.

Stratigraphy

Units that are currently documented on Prince of Wales Island include Ordovician deep-water rocks of the Descon Formation (named by Eberlein and Churkin, 1970) including andesitic breccia referred informally as the breccia of Luck Creek. The Descon Formation is succeeded by Silurian (late Llandovery-Ludlow), shallow-water carbonates of the Heceta Limestone (Eberlein and Churkin, 1970) and overlain in turn by redbed clastics of the Karheen Formation.

The Descon Formation is composed of deepwater graptolite-bearing turbidites. Limestone exposed near Naukati Creek, 6 mi west of Locality 03SK153, depositionally overlies volcanic rocks, and consists of micritic, wavy, 2–6-cm-thick beds with stylolitic partings that contain a variety of Ordovician shallow-water fossils, including gastropods, favositid cor-als, crinoids, and brachiopods. Some beds were broken into angular pebbles and cobbles by contemporaneous bed dis-ruption. More of this Ordovician limestone is probably present on Prince of Wales Island, but as yet it is undiscovered. Shallow-water Ordovician limestone has not been previously recognized on Prince of Wales Island, or elsewhere in southeastern Alaska.

Luck Creek Breccia

The breccia of Luck Creek was informally proposed by Eberlein and others (1983) for andesitic breccia within the Descon Formation. Eberlein and others (1983) considered the Luck Creek to be Upper Ordovician to Lower Silurian based on a radiometric date of about 440 ma (Lower Silurian, Rhuddanian), and to be equivalent in part to the Dicello-graptus ornatus Zone (Upper Ordovician, Ashgill). Many of the small limestone bodies are associated with the Luck Creek (fig. 3)

Eberlein and others (1983) include a dark-gray knobbly limestone with halysitid corals within the Luck Creek on Diver Island, Craig C-3 quadrangle, 55°54’ N, 133°55’W. According to Oliver (written E&R, 1975) it is Silurian: “Ludlovian?. This is certainly pre-Devonian and almost certainly Silurian although Ordovician is not entirely ruled out. Rhegmaphyllum-like corals range through the Silurian; the Helioplasmolites? suggests Late Silurian (Ludlovian).”

USGS locality 8277-CO is an island in Thorne Bay north of Davidson Landing (fig 2). The collection made by M. Churkin was examined by W. Oliver who said, “Probably late Middle or Late Ordovician. Two fragments of this are the whole collection. Preservation is poor but the only thing like it that I know of is Reuschia. This occurs in the Seward Pen-insula below the typical Bighornia assemblage and is late Middle or early Late Ordovician in age. Elsewhere it may range somewhat younger.” Reuschia is known from Asia but not Laurentia.

Other silicified fossils collected and identified by us from Davidson landing include an indet. coiled nautiloid cephalo-pod, an inarticulate brachiopod (fig. 5) and the gastropod Daidia (fig. 6). Daidia occurs in ancestral North America, but this locality and the Seward Peninsula are the only know occurrences outside Laurentia.

Clast from Karheen Conglomerate

Conglomerate in the Karheen Formation at Locality 03SK153, northern Prince of Wales Island (fig 2), appears to be near the base of the earliest redbeds in the stratigraphic column on Prince of Wales Island. This conglomerate is unique among the redbeds because it has some interstitial carbonate and was likely marginal marine/deltaic. The con-glomerate in the borrow pit contains dominantly rounded, intermediate to mafic volcanic cobbles and boulders, and about 5% limestone clasts which are less rounded (less transported) than the volcanic cobbles and boulders exposed at the same locality. The percent of limestone clasts increases slightly down section. The conglomerate has a calcareous matrix, and probably represents a shallow marine delta.


A single large limestone clast was collected from a borrow pit in the Karheen. The silicified fauna recovered from etching the large Ordovician limestone clast from Locality 03SK153 includes abundant “sphinctozoan” sponges which are the dominant element of the fauna described by Rigby and others (2005) (fig. 3), followed by tabulate corals, stroma-toporoids, gastropods, and brachiopods. The gastropods included an incomplete operculum of Maclurites (figs. 7-8), Tropidodiscus (figs. 9-10), and several unidentifiable fragments. The operculum is relatively thin and preserves the mus-cle process. The range of macluritid opercula is upper Lower Ordovician to Upper Ordovician, and representatives of this age range are found in Alaska. The fragment is similar to opercula found in the Upper Ordovician of the Seward Penin-sula (Rohr, 1988), and thinner than those from the Middle Ordovician of the Medfra Quadrangle [of west-central Alaska] (Rohr and Gubanov, 1997). Opercula from the Klamath Mountains are of Middle Ordovician age (Rohr, 1980). Two specimens of brachiopods were identified by R.B. Blodgett and A. J. Boucot -- Catazyga and an anazygoidean. A portion of the matrix was etched for conodonts, but none were found.

Two Late Ordovician fossil localities are mapped 4 km to the northwest of Locality 03SK153. To the east of these limestone occurrences is a large area of Ordovician to Silurian mafic to intermediate volcanic rocks that contain lenses of shallow-water limestone, as well as deep-water graptolitic shales. Some of these limestones contain Late Ordovician to Early Siluran corals, including Catenipora (Eberlein et al. 1983).

Conclusions

Although Ordovician limestone clasts were reworked from a shallow-water source, we find no evidence of a larger carbonate platform in southeast Alaska. We conclude that the Ordovician limestones were only present as patch reefs around small volcanic islands in the southeastern Alaska part of the Alexander terrane.

Acknowledgments

Fieldwork was supported in part by the U.S. Forest Service and a grant from the National Geographic Society.

References

Berg, H.C., Jones, D.L. & Coney, P.J., 1978. Map showing pre-Cenozoic tectonostratigraphic terranes of southeastern Alaska and adjacent areas. U.S. Geological Survey Open-File Report 78-1085, 2 sheets, scale 1:1,000,000.

Berg, H.C., Jones, D.L. & Richter, D.H., 1972. Gravina-Nutzotin Belt; tectonic significance of an upper Mesozoic sedi-mentary and volcanic sequence in southern and southeastern Alaska. U.S. Geological Survey Professional Pa-per 800-D, pp. D1-D24.

Blodgett, R.B., Boucot, A. J., Rohr, D.M., & Pedder, A.E.H., 2010. The Alexander terrane – a displaced fragment of northeast Russia? Evidence from Silurian-Middle Devonian megafossils and stratigraphy. Memoirs of the Asso-ciation of Australasian Palaeontologists 39, pp. 325-341.

Blodgett, R.B., Rohr, D.M. & Boucot, A.J., 2002. Paleozoic links among some Alaskan accreted terranes and Siberia based on megafossils. 273-290 in Miller, E.L., Grantz, A. & Klemper, S.L. (eds), Tectonic evolution of the Bering Shelf-Chukchi Sea-Arctic margin and adjacent landmasses. Geological Society of America Special Paper 360.

Coney, P.J., Jones, D.L. & Monger, J.W.H., 1980. Cordilleran suspect terranes. Nature 388, pp. 329-333.

Eberlein, G.D. & Churkin, M., Jr., 1970. Paleozoic stratigraphy in the northwest coastal area of Prince of Wales Island, southeastern Alaska. U.S. Geological Survey Bulletin 1284, 67 p.

Eberlein, G, Churkin, M, Carter, C, Berg, H, & Ovenshine, A. 1983. Geology of the Craig Quadrangle, Alaska. U.S. Geo-logical Survey Open-File Report 83-91, 52 p., 4 sheets, scale 1:250,000.

Gehrels, G.E. & Berg, H.C., 1994. Geology of southeastern Alaska. 451-467 in Plafker, G. & Berg, H.C. (eds), The geol-ogy of Alaska. Geology of North America Volume G-1. Geological Society of America, Boulder.

Monger, J.W.H. & Berg, H.C., 1987. Lithotectonic map of western Canada and southeastern Alaska. U.S. Geological Survey Miscellaneous Field Studies Map MF-1874-B, 1 sheet, scale 1:2,500,000.

Rigby, J. Keith, Susan M. Karl, Robert B. Blodgett, & James F. Baichtal. 2005. Ordovician 'sphinctozoan' sponges from Prince of Wales Island, Southeastern Alaska." Journal Of Paleontology 79, no. 5, pp. 862-870.

Rohr, D.M. 1980. Ordovician�Devonian Gastropoda from the Klamath Mountains, California. Palaeontographica A:141�199.

Rohr, D.M. 1988, Upper Ordovician gastropods from the Seward Peninsula, Alaska, Journal of Paleontology, 62, 4, pp. 551-566.

Rohr, D, & Gubanov, A. 1997. Macluritid opercula (Gastropoda) from the Middle Ordovician of Siberia and Alaska, Jour-nal of Paleontology, 71, 3, pp. 394-400.


Figure 1. Prince of Wales Island (POW) in southeastern Alaska is part of the Alexander terrane.

Figure 2. Location of fossiliferous Ordovician limestone on POW Island.

Figure 3. Sponge cross sections in a meter-scale limestone lens within in massive Luck Creek breccia. Anita Harris (2004 report) identified Late Ordovician (Edenian-Richmondian) conodonts from here. Locality 03SK193.

A

D

Figure 4. Silicified fossils in limestone at Davidson Landing. Locality 06SK034.

Figure 5. (right) Inarticulate brachiopod from Davidson landing. Scale in cm.


Figures 7 and 8. Fossil gastropods in Karheen limestone clast -- Maclurites operculum. Side view showing muscle attachment process (above), exterior view of a broken specimen (right). Scales are in mm. Locality 03SK153.

Figure 6. The gastropod Daidia from Davidson landing. Scale in mm.

Figures 9 and 10. Tropidodiscus in Karheen limestone clast, umbilical and dorsal views. Scale in mm.

AGS Logo T-Shirts ($25 ea.) (Black shown – also available in Gray and Dark Blue) Limited sizes available so gets yours early !!!


Calendar of Events

Date Time Organiza on Event Loca on

2/3/14 – 2/7/14

Alaska Forum on the Environ‐ment

Alaska Forum on the Environment www.akforum

Dena'ina Civic & Con‐ven on Center

2/12/14 12:00pm – 1:00pm

Alaska Miners Associa on

North Slope Ac vi es – Conoco Phillips Sourdough Mining Co, Anchorage

2/12/14 11:30am – 1:00pm

Society of Pe‐troleum Engi‐neers

“Arc c Petroleum Resources: Basis for Petroleum Ac vi es in the 21st Century”. Anatoly Zolotukhin, Professor at the Gubkin Russian State University of Oil and Gas

BP main floor Confer‐ence Rooms A, B, C., Anchorage

2/20/14 11:30 – 1:00pm

Alaska Geologi‐cal Society

David Houseknecht ‐USGS, Geologist ‐ “Alaska’s North Slope and the Chukchi Shelf”

BP Energy Center, Anchorage

2/28/14 10:00am – 3:00pm

UAA Geosciences Career Fair Conoco‐Phillips Bldg., UAA, Anchorage

3/12/14 12:00pm – 1:00pm


Ambler Mining District Access Project Dowl HKM Sourdough Mining Co, Anchorage

3/20/14 11:30 – 1:00pm


Greg Wilson, ConocoPhillips Alaska “Devil’s Paw Prospect, Chukchi Sea Alaska” Joint mee ng with Geophysical Society of Alaska ‐

BP Energy Center, Anchorage

3/24/14 – 3/28/13

ASMC Survey & Mapping Conference Westmark Hotel, Fairbanks

4/1/14 – 4/2/14

ANVCA Alaska Na ve Village CEO Associa on –Mining & Resource Development Conference

Dena’Ina Center, An‐chorage

4/9/14 12:00pm – 1:00pm


Becci Anderson USGS Spa al Mapping Project Sourdough Mining Co, Anchorage

4/7/14 – 4/13/14


24th Fairbanks Biennial Conference Carlson Center, Fair‐banks

4/11/14 11:30 – 1:00pm


John Kaldi University of Adelaide; Dis nguished Lec‐turer “Carbon Capture and Storage” (Joint mee ng with Society of Petroleum Engineers Alaska Sec on)

Main Conference rooms A,B,C at BP Explora on Alaska

5/15/14 9:00am – 5:00pm


AGS Spring Technical Conference – Cook Inlet Gate‐way to Alaska

UAA Conoco‐Phillips Building, Anchorage

5/15/14 11:30 – 1:00pm


David LaPain, Alaska DGGS – “Cook Inlet” Part of AGS Spring Technical Conference

UAA Conoco‐Phillips Building, Anchorage

5/16/14 9:00am – 5:00pm


Conference Field Trip. Bird Creek to Hatcher Pass.

Volunteer NeededVolunteer Needed to represent AGS at the annual AAPG meeting in Houston, TX

on Sunday, April 6.

Must be a member of AGS and AAPG. If interested contact:

Matt Frankforter ([email protected])

or

Marwan Wartes ([email protected])


Membership Note

Membership renewal is Nov. 1

Annual dues are: Full members - $25 Students - $5


Enhanced Alaska Digital Well Log Data Since 1989

OCS, 95 out of 100 Alaska OCS wells. Mud logs for some. North Aleutian Basin wells, onshore and offshore. North Slope, 556 wildcats and key field wells. Kuparuk River Field, first 567 wells drilled (pre-1985). Southern Alaska, 1063 wells including all wildcats and many field wells. Directional surveys for most.

All digital log files Are depth shifted to match resistivity curves. Have core data rendered as a depth-shifted well log curve. Have SP both in original form and as a straightened curve. Have standardized mnemonics. Have Volume of Shale curves, derived from gamma ray for North Slope, derived from SP for Cook Inlet. Allow you to specify your own choice of mnemonics before delivery. Are updated periodically with new wildcat wells. Are delivered in LAS 2.0 format.

Contact Dan Shier: 303-278-1261 [email protected] www.rockypine.com


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Commi ees and Delegates

Phone e-mail Workplace President Matt Frankforter 777-8376 mfrankforter at hilcorp.com Hilcorp Alaska, LLC Past-President Art Banet banetak at gci.net BLM emeritus President-Elect Keith Torrance 677-9451 ktorrance at apcservicesllc.com APC Services LLC Vice-President Monte Mabry 564-4028 monte.mabry at bp.com BP Treasurer Al Hunter 947-9010 paleoman at mac.com Secretary Eric Cannon 344-6001 eccannon at gmail.com Golder Associate Inc. Director 12-2014 Chad Hults 332-0740 chadcph at gmail.com Director 12-2014 Trystan Herriott 451-5011 trystan.herriott at alaska.gov DGGS Director 12-2014 Kirk Sherwood 334-5337 kirk.sherwood at boem.gov BOEM Director 13-2015 Richard Lease 786-7169 rlease at usgs.gov USGS Director 13-2015 Tom Morahan 230-1672 tmorahan at petroak.com PRA Director 13-2015 Jim Brown 276-2675 jbrown at alaskapacific.edu Alaska Pacific University

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ConocoPhillips Devils Paw Prospect, Chukchi Sea: A ... 2014 Newsletter.pdf · Volume 44 Number 7 March 2014 Page 1 ConocoPhillips Devils Paw Prospect, Chukchi Sea: A Beaufortian Play

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