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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 Beluga River Field, Undefined Gas Pool
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  Operator: ConocoPhillips Alaska Inc. Index map
Discovery Well: Standard Oil Co. of California
Beluga River Unit No. 1
Permit No. 162-018
API No. 50-083-10027-00-00
Sec. 35, T13N, R10E, SM
Depth: 16,429 MD / 16,429' TVD
December 1, 1962
  Status: Producing
Location: Cook Inlet Basin Area Location Map Unit Location Map DNR Unit Map
References: List of Orders Summary - Annotated Reference List  

The Beluga River Field is a shallow, 7-mile long and 2-1/2-mile wide gas accumulation located along the western shoreline of the Cook Inlet, about 40 miles west of Anchorage. This field was discovered in December 1962 while exploring for a deeper oil objective. Regular gas production began in March 1968 and cumulative production through April 2011 totals 1.198 trillion cubic feet. Currently, 25 wells penetrate the Beluga River Undefined Gas Pool, which includes all of the gas-bearing sands in the field. Of these 25 wells, 21 are currently completed as producers, but only 15 produced gas during the first four months of 2011. The field is a major supplier for local electric utilities and home gas usage in the Anchorage area. ConocoPhillips Alaska, Inc operates the field for its co-owners Chevron and Municipal Light and Power. (Contributed by John Braden, ConocoPhillips; updated by AOGCC)



The Beluga River structure is a broad, north-northeastern trending fault propagation fold with a steep dipping reverse fault on the west side. The field produces from two Tertiary-aged formations: the high net-to-gross Pliocene-aged Sterling Formation and the underlying, low net-to-gross Miocene-aged Beluga Formation. Gross reservoir thickness is up to 3,200 feet, and it consists of dozens of stacked channel belt and crevasse splay sands encased in relatively impermeable siltstone, mudstone and coal. The sand deposits are discontinuous, relatively small in size, and their reservoir quality varies with composition (feldspathic litharenite to argillaceous litharenite) and degree of compaction. Ubiquitous interbedded thin and widespread coals source the tremendous volume of biogenic gas trapped within the field.

After 43 years of production, the Beluga River Field is mature: much of the reservoir is depleted to under 40% of original pressure, and most of the down-structure wells have water encroaching in some sands. Reserve estimates for the field can be found in Thomas, et al., 2004, and Hartz, et al., 2009. (Contributed by John Braden, ConocoPhillips; updated using Levinson, R.A., 2011)


Structure Map Strat Column Representative Log
Production: Prod Chart    
  Gas (mcf) Water (bbls)
Cumulative 1,218,394,260 1,132,036
2005 Total
55,860,100 25,931
2006 Total
55,363,873 97,600
2007 Total
47,964,660 37,862
2008 Total
42,852,427 110,448
2009 Total
40,888,197 224,502
2010 Total
38,246,156 267,721
2011 Total
32,438,637 336,370
2007 Rate (mcf/d)
131,410 104
2008 Rate (mcf/d)
117,404 303
2009 Rate (mcf/d)
112,022 615
2010 Rate (mcf/d)
104,784 733
2011 Rate (mcf/d)
88,873 922
2008 Change (%)
-11 191
2009 Change (%)
-5 103
2010 Change (%)
-6 19
2011 Change (%)
-15 26
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