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Alaska Oil and Gas Conservation Commission

Alaska Department of Administration, Alaska Oil and Gas Conservation Commission
Administration >  AOGCC >  Statistical Reports >  Annual Pool Statistics - 2004 >  McArthur River Field, Mid Kenai Gas Pool
AOGCC Pool Statistics McArthur River Field, Mid Kenai Gas Pool
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  Operator: Union Oil Company of California
Discovery Well: Union Oil Company of California.
Trading Bay Unit G-18
Permit #168-105
API No. 50-733-20160-00-00
Sec. 28, T09N, R13W, SM
Depth: 6,390’ MD / 4,510' TVD
December 2, 1968
  Status: Producing
Location: Cook Inlet Area Loc. Map DNR Unit Map
Orders: Complete List
Summary:
Production from the Middle Kenai Gas Pool began in December 1968 from the Grayling Platform, followed shortly thereafter by production from the Dolly Varden and King Salmon Platforms. The initial production consisted of "wet" gas, which contains appreciable amounts of natural gas liquids produced in association with oil from the West Foreland, Hemlock and Middle Kenai G oil pools. Most of the associated gas produced from McArthur River prior to 1988 was not sold commercially; it was used to fuel lease operations and provide gas lift. In 1988, the Steelhead Platform was constructed to produce “dry” gas (methane) from the Grayling Gas Sands. Production from the pool peaked at 225 billion cubic feet per day in November 1997. During December 2004, production from the platform averaged 92.5 million cubic feet per day. About 4% of the gas from this pool is now used for lease operations, and the remainder is sold commercially.

The Middle Kenai Gas Pool is defined as the accumulation of gas common to, and correlative with, the accumulation found in the Marathon Trading Bay Unit wells between the measured depths of 1,518’ in well M-1 to 8,982’ in well M-14. The Middle Kenai Gas Pool (also known as Grayling Gas Sands) is located within the Upper Middle Miocene Chuitna and Middle Ground Shoal members of the Tyonek Formation, which are part of the Kenai Group. The reservoir sands occur in a continuous sequence that contains the gas accumulations. As currently defined, the Middle Kenai Gas Pool consists of the Upper A series, Zones A through F, and the G-O series, which lies above the G Zone Oil Pool.

In the vicinity of the Steelhead Platform, the non-marine sediments of the Middle Kenai Gas Pool were deposited in fluvial-alluvial meander belts. The sand/shale sequences within this portion of the Tyonek Formation are interbedded with distinctive coal layers, suggesting low energy, swamp-like conditions. Sand units are often conglomeratic, generally thin (20 to 50 feet thick), and may not persist laterally. Porosity ranges from 12 to 32 percent. The McArthur River Field structure is an asymmetric anticline that is oriented approximately north 20° east. The structure is cut by two normal faults that do not affect the limits of the hydrocarbon reservoirs.

McArthur River original gas in place is estimated to be 1.35 TCF.

Structure Map Strat Column
Orig. Gas in Place: 1.35 TCF (Thomas, and others, 2004)
Production: Prod Chart Prod Report Prod Data
  Gas (mcf) Water (bbls) Disposed Fluids (bbls)
Cumulative 999,297,501 362,990 0
2001 Total 58,570,285 58,205 0
2002 Total 48,674,161 32,634 0
2003 Total 37,133,934 31,726 0
2004 Total 32,773,113 12,371 0
2003 Rate (/d) 101,737 87 0
2004 Rate (/d) 89,789 34 0
Change (%) -12% -61% 0%
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