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Pikka-Horseshoe, Willow and Smith Bay: Unraveling …

ALA SKA GE O. L GY. EOLOGICA. G. L. O. A. SO. K. AS. CI. ET. AL. Y. Newsletter of the A S. Alaska Geological Society G. Pikka-Horseshoe, Willow and Smith Bay: Unraveling Three New Discoveries with Publicly Available Data Josef Chmielowski Alaska Division of Oil & Gas, Anchorage, AK. In the last few years, three new discoveries have been announced in the lower Brookian Sequence on the North Slope: Pikka-Horseshoe, Willow and Smith Bay. These exciting prospects and the Nanushuk and Torok Formation plays that host them are at varying stages of exploration maturity.

Volume 48 Number 8 April, 2018 Page 2 Dip-oriented seismic section through the Nanuq South 3D seismic tax credit survey a few miles north of the Horse-

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1 ALA SKA GE O. L GY. EOLOGICA. G. L. O. A. SO. K. AS. CI. ET. AL. Y. Newsletter of the A S. Alaska Geological Society G. Pikka-Horseshoe, Willow and Smith Bay: Unraveling Three New Discoveries with Publicly Available Data Josef Chmielowski Alaska Division of Oil & Gas, Anchorage, AK. In the last few years, three new discoveries have been announced in the lower Brookian Sequence on the North Slope: Pikka-Horseshoe, Willow and Smith Bay. These exciting prospects and the Nanushuk and Torok Formation plays that host them are at varying stages of exploration maturity.

2 Plans for the 2018 winter activity season call for significant delineation drilling in both the Pikka-Horseshoe and Willow trends. Utilizing only pub- licly available data, it is possible to ascertain how these discoveries are related, how they differ, and why explo- ration drilling permits are targeting certain locations. Under the State of Alaska's tax credit program, the Department of Natural Resources has recently released multiple 2D and 3D seismic datasets through the Alaska Geologic Materials Center. These datasets are available to industry at steeply discounted cost, and free-of-charge to qualifying research, education, and governmental institutions.

3 One such dataset, the high quality Nanuq South 3D, covers the southern half of the Pikka-Horseshoe discovery. In addition, the survey includes the region where the Stony Hill 1/1A and Putu 2/2A exploration wells are permitted for drilling this winter season. Brookian clinoforms are clear in seismic cross section, comprising the Nanushuk topsets and their time-equivalent Torok foresets and bottomsets. Basic 3D amplitude extractions highlight prospective areas and vintage 2D seismic lines tie together these discoveries while also providing an understanding of the regional geological system.

4 AGS Luncheon Date & Time: Tuesday, April 24, 11:30 am 1:00 pm Program: Pikka-Horseshoe, Willow and Smith Bay: Unraveling three new discoveries with publicly available data Speaker: Josef Chmielowski, Alaska Division of Oil & Gas, Anchorage, AK. Place: BP Energy Center, 1014 Energy Court, Anchorage, AK. Reservations: Make your reservation before noon Friday, April 20, 2018. Cost: Seminar is free (catered lunches are no longer available). Fell free to bring your own brown-bag lunch For more information call (907) 854-2363 or visit the AGS website: Volume 48 Number 8 April, 2018 Page 1.

5 Dip-oriented seismic section through the Nanuq South 3D seismic tax credit survey a few miles north of the Horse- shoe 1 and 1A discoveries drilled in 2017. Lower Brookian clinoforms are clearly visible, consisting of Nanushuk topsets and Torok foresets/bottomsets. The Stony Hill 1 and 1A exploration wells are shown schematically, based on permitted surface and bottom-hole coordinates, but target depths and the deviated wellbore trajectory are un- known. The legacy Itkillik River Unit #1 well at right penetrated Top Nanushuk at approximately -4,243 ft subsea Map view of the Nanushuk 3 horizon two-way time structure in- Map view of a far stack RMS amplitude extraction (+20ms offset, dicating the shelf-slope break in yellow.)

6 Interpretation picked on 60ms window). Green colors indicate higher relative amplitudes a 5X5 grid and two-way time range is to seconds. versus the surrounding blue colors. The dotted line indicates the Pikka-Horseshoe discovery while the Stony Hill and Putu per- mitted surface locations correspond with amplitude anomalies. Volume 48 Number 8 April, 2018 page 2 . About the Speaker: Joe Chmielowski was born and raised in Alaska. He earned a BA in physics and a BS in geology from Rutgers College in New Jersey. He received an MS in geophysics from the University of Arizona, Tucson for his work uti- lizing earthquake seismology to image the largest active magma body in the world (about 15 kilometers beneath the Andean Altiplano in Bolivia).

7 In 1999, he returned to Alaska as an interpretation geophysicist for BP. He has worked in a variety of BP roles including: slope-wide exploration, Prudhoe Bay light oil production, Milne Point viscous oil appraisal & develop- ment, business strategy, Egypt gas exploration (cut short due to the Arab Spring revolution) and the Appraisal Team Lead for Ugnu Heavy Oil and the Liberty offshore development. In 2016, Joe joined the State of Alaska, Division of Oil & Gas with a focus on Western North Slope exploration and new developments. From the President's Desk: Please help me thank Art Banet for stepping up and volunteering to become the President- Elect on this year's AGS board.

8 He will assume the AGS Presidency next year. That was a big help for me in my succession plan- ning for next year. However, I still have two officer positions to fill for next year's board. I still need someone for the President-Elect and Vice President positions for next year. The president-elect will assume the presidency during the 2019-20 fiscal year, The Vice President organizes the speaker program and the Spring Tech Confer- ence. It is a challenging but rewarding role to fill. Anyone thinking they are up for a challenge, please be sure to contact me ASAP as the spring election should be held at either the April or May lunch time meeting.

9 We are also still looking for interesting talks and poster papers for the April 20th Tech Conference, which is being held at UAA. We will have the registration link for the conference on the AGS website home page soon so please be sure to check back and register starting in early April. The registration fee is $65 for professionals and $5 for students. Hope to see you there. Regards ~Larry The Alaska Geological Society will be hosting a one-day technical conference on topics related to the ge- ology of Alaska. The 2018 conference will be held at the University of Alaska, Anchorage, ConocoPhillips Integrated Science Building, on Friday, April 20th.

10 Talks will include topics such as basin stratigraphy and interpretation, North Slope hydrocarbon reservoirs, tectonics, mineral resources, geo-hazards and regional geological mapping. For more information visit the AGS website: Volume 48 Number 8 April, 2018 Page 3. My Pet Rock Robert J Gillis Alaska Division of Geological & Geophysical Surveys Folded Kamishak Formation strata in the proximal hangingwall of the Bruin Bay fault near Con- tact Point, lower Cook Inlet. Much like textbook clay models, the layer-cake appearance created by alternating marble (light) and metapelite (dark) banding highlight contractional faulting in the antiformal axis that help alleviate the space problem created by tight folding of its core.


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