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Alaska Oil and Gas Conservation Commission

Alaska Department of Administration, Alaska Oil and Gas Conservation Commission
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AOGCC Pool Statistics
Point Thomson, Undefined Oil
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Operator: ExxonMobil Corporation
Index Map
Discovery Well: Exxon Corporation
  Pt Thomson Unit No. 1
  Permit No.176-085
  API No. 50-089-20005-00-00
  Sec. 32, T10N, R23E UM

Depth: 13,298 MD / 13,298' TVD

December 8, 1977

Status: Awaiting Development
Location: Central Arctic Slope Area Location Map Pool Location Map DNR Unit Maps
Orders: List of Orders Summary - Annotated References  
Summary:

The Point Thomson Undefined Oil Pool is located on the Arctic Slope of Alaska, about 60 miles east of Prudhoe Bay. The pool was discovered in 1977 by Exxon Corporation's Pt. Thomson Unit No. 1 exploratory well that flow-tested 18.5°API gravity “pipeline-quality oil” at an average rate of about 2,300 barrels per day from the informally named Thomson Sand, which lies between 12,815’ and 13,161’ measured depth. The average reported gas-oil ratio was about 5,800 cubic feet per stock tank barrel. The existence of hydrocarbons at Point Thomson was confirmed during 1978 and 1979 by the Pt. Thomson Unit No. 2 and No. 3 exploratory wells. Five tests of the Thomson Sand conducted in four wells flowed between 170 and 2,283 barrels of oil per day and between 3.4 and 13.3 million cubic feet of gas per day, yielding reported gas-oil-ratios from 3,890 to 22,705 standard cubic feet per stock tank barrel. Because Commission regulation 20 AAC 25.990 (45) defines an “oil well” as a well that produces predominantly oil at a gas-oil ratio of 100,000 standard cubic feet per stock tank barrel or lower, the Point Thomson Undefined Pool is classified as an oil pool.

During 2009 and 2010, ExxonMobil drilled and suspended two new exploratory wells, PTU No. 15 and PTU No. 16, that are part of a cycling project designed to test the production potential of the pool. As of November 2011, the Alaska Oil and Gas Conservation Commission’s website does not report any production from, or injection into, this pool.


Geology:

The main reservoir of the Point Thomson Undefined Oil Pool is the Thomson Sand. This Cretaceous-aged (Neocomian) conglomeratic sandstone is about 12 miles long, 5 miles wide and ranges up to about 350 feet thick in the Point Thomson area. It is stratigraphically equivalent to the Kemik Sandstone that is located approximately 30 miles to the south. The Thomson Sand consists of very fine- to very coarse-grained, dolomite-rich sandstone that contains argillaceous rock fragments. Dolomite-rich pebble-, cobble- and boulder-conglomerates are locally abundant. The Thomson Sand unconformably overlies pre-Mississippian-aged dolomite and argillite basement rocks and it is, in turn, overlain by the Pebble Shale. The abundance of coarse, dolomite clasts and close association with an erosional unconformity suggest a local source for the Thomson Sand.

Secondary reservoirs at Point Thomson are the pre-Mississippian basement and the marine sandstones of the Cretaceous- to Oligocene-aged Canning Formation, which have both produced oil and gas during well tests. Abnormal fluid pressure gradients, as high as 0.84 psi per foot, have been reported for the basement rock and the overlying Thomson Sand, Pebble Shale, Hue Shale, and lower Canning Formation (in ascending order).

  Strat Column Representative Log
Production:            

  Oil (bbls) NGL (bbls) Gas (mcf) Water (bbls)
Cumulative 0 0 0 0
2005 Total
0 0 0 0
2006 Total
0 0 0 0
2007 Total
0 0 0 0
2008 Total
0 0 0 0
2009 Total
0 0 0 0
2010 Total
0 0 0 0
2011 Total
0 0 0 0
2007 Rate (b/d)
0 0 0 0
2008 Rate (b/d)
0 0 0 0
2009 Rate (b/d)
0 0 0 0
2010 Rate (b/d)
0 0 0 0
2011 Rate (b/d) 0 0 0 0
2008 Change (%)
0 0 0 0
2009 Change (%)
0 0 0 0
2010 Change (%)
0 0 0 0
2011 Change (%)
0 0 0 0

 

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