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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 Sterling Field, Beluga Undefined Gas Pool
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Marathon Oil Company

Index map
Discovery Well: Union Oil Co. of California
Sterling Unit No. 41-15
Permit No. 198-041
API No. 50-133-20484-00-00
Secs. 9 and 15, T05N, R10W, SM
Depth: 12,600’ MD / 10,559' TVD
January 19, 1999

Status: Shut-in
Location: Cook Inlet Basin Area Location Map   DNR Unit Map
References: List of Orders Summary - Annotated Reference List  

This one-well gas pool was produced by the Sterling Unit No. 41-15 well between the measured depths of 9,440' and 10,026' (7,905' to 8,326' TVD). From April 1999 to January 2005, the pool yielded 436,340,000 cubic feet of gas and 7,539 barrels of water. It has been shut in since February 2005.



At Beluga Formation level, the Sterling Field structure consists of a broad anticline that trends northwest and lies about 7 miles east-southeast of the City of Kenai. The flanks of the anticline dip with a slope of about 100 to 130 feet per mile (about 1° to 1-1/2°).


In the Sterling Field area, the Miocene-aged Beluga Formation is composed of interbedded, nonmarine mudstone, siltstone, and sandstone with minor amounts of lignitic to sub-bituminous coal that occurs in thin (less than 5 feet thick), regionally discontinuous beds. The Beluga formation is characterized by a low net-to-gross sand ratio. Beluga sediments were sourced by the erosion of metasedimentary rocks of the Kenai-Chugach Mountains to the east, and deposited by westward-flowing, high-gradient, shallow, braided streams that, over time, built alluvial fans toward the center of the Cook Inlet Basin. Because this fan sequence prograded toward the west, the Beluga depositional sequence grades upward from thin, outwash-plain sandstone deposits in the lower part of the formation to thicker, higher-quality, anastomosing-stream sandstone deposits in the upper formation. Mudstone and coal beds are common to abundant in the Beluga Formation, which is unusual for alluvial fan deposits. The nearby Kenai-Chugach Mountains are composed mainly of metamorphosed fine-grained, deep-sea sediments (metasiltstone, metasandstone, argillite, slate, and phyllite). Erosion of these fine-grained rocks apparently supplied large quantities of silt and mud that was spread over the alluvial fan surfaces by sheet-floods and then stabilized by abundant vegetation. As a result, Beluga sandstone reservoirs are commonly laterally discontinuous and isolated from one another by mudstone and siltstone.


Structure Map Strat Column Representative Log
Production: Prod Chart    
  Gas (mcf) Water (bbls)
Cumulative 436,340 7,539
2005 Total
3,852 35
2006 Total
0 0
2007 Total
0 0
2008 Total
0 0
2009 Total
0 0
2010 Total
0 0
2011 Total
0 0
2007 Rate (mcf/d)
0 0
2008 Rate (mcf/d)
0 0
2009 Rate (mcf/d)
0 0
2010 Rate (mcf/d)
0 0
2011 Rate (mcf/d)
0 0
2008 Change (%)
0 0
2009 Change (%)
0 0
2010 Change (%)
0 0
2011 Change (%)
0 0
Years 2005 thru 2008 volumes have been corrected to reflect the re-assignment of wells within the Sterling Field Pools.

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