Department of Administration

Alaska Oil and Gas Conservation Commission

Alaska Department of Administration, Alaska Oil and Gas Conservation Commission
Administration >  AOGCC >  Statistical Reports >  Current Oil & Gas Pools Statistics >  Kenai Field, Sterling Gas Pool 6
AOGCC Pool Statistics Kenai Field, Sterling Gas Pool 6
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  Operator: Marathon Oil Company
Index Map
Discovery Well: Union Oil Company of California
Kenai Unit No. 14-06
Permit #159-002
API No. 50-133-10088-00-00
Sec. 06, T04N, R11W, SM
Depth: 12,037 MD / 12,037' TVD
October 11, 1959

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

Sterling Gas Pool 6 within the Kenai Gas Field is defined as the accumulation of gas common to and which correlates with the accumulation found in the interval 5250' to 5520' in the KU 21-06 well. This pool was discovered on October 11, 1959 by the Kenai Unit No. 14-06 well, and regular gas production began in July 1961 from the Kenai Unit 14-06 and 34-31 wells. Production peaked at an average daily rate of 82,434,000 cubic feet per day in October 1982 from 12 production wells, then began to decline. During 2000, 2001 and 2002, two new wells were drilled and two existing wells were re-drilled, significantly increasing production. Gas-storage operations began in the pool during May 2006.


Geology:

The Kenai Gas Field structure consists of an asymmetric anticline that trends north-south that lies about 5 miles south of the City of Kenai. The axis of this anticline is parallel with, and about 1 mile east of, the eastern coastline of the Cook Inlet. The eastern flank of the anticline dips toward the east with a slope of about 300 feet per mile, while the western flank dips westward at about 800 feet per mile. At the top of Sterling Gas Pool 6, the crest of the anticline lies about 4,440’ below sea level, about 300’ below the top of Sterling Gas Pool 5.2 and about 700’ below the top of Sterling Gas Pool 4. At the 5,000-foot elevation contour (below sea level), the anticline measures about 5-1/2 miles long and 3-1/4 miles wide. The Kenai Gas Field anticline lies on trend with, but is fault-separated from and is shallower than, the Cannery Loop anticline that lies 5 miles to the north.

 

In the Kenai-Cannery Loop area, the Pliocene-aged Sterling Formation comprises thick, continuous, sandstones of good reservoir quality that were deposited by large, meandering streams. These streams flowed south and southeastward from the Aleutian-Alaska Ranges, parallel to the basin axis, and produced 30- to 60-foot thick point-bar sandstones that are laterally continuous and separated by layers of flood-plain siltstone, mudstone and coal. Active volcanism, uplift, and erosion of the Aleutian and Alaska Ranges provided constituent sediments that ranged from sand (generally fine-grained, but rarely pebbly) to mud. The sand-sized sediment fraction consists mainly of quartz, plagioclase, biotite, and volcanic rock fragments. Rare pebbles consist of coarse-grained plutonic and fine-grained volcanic rocks. Sterling sandstones have good reservoir quality because of diagenetic dissolution of minerals and volcanic rock fragments producing secondary porosity and yielding effective porosities ranging up to 31 percent and permeabilities that may exceed one darcy. The Sterling Formation is characterized by a high net-to-gross sand ratio.

 

  Strat Column Representative Log
Production: Prod Chart    
  Gas (mcf) Water (bbls)
Cumulative 540,301,335 121,410
2005 Total
5,597,665 4,813
2006 Total
4,485,079 3,903
2007 Total
3,631,420 1,753
2008 Total
1,856,226 427
2009 Total
710,108 125
2010 Total
3,727,386 931
2011 Total
2,255,852 1,580
2007 Rate (mcf/d)
9,949 5
2008 Rate (mcf/d)
5,086 1
2009 Rate (mcf/d)
1,946 0
2010 Rate (mcf/d)
10,212 3
2011 Rate (mcf/d)
6,180 4
2008 Change (%)
-49 -80
2009 Change (%)
-62 -100
2010 Change (%)
425 645
2011 Change (%)
-39 33
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