Depositional Model and Exploration Potential in the St. Louis Carbonates Beneath the Hugoton Field of Kansas

Kansas Geological Survey
Open-file Report 2002-8

Pleasant Prairie Pool Study Model and Analagous Pool Studies

Lakin Pool Complex
T25S-36W Sections 28, 33-34
T26S-36W Sections 4, 9-10

Method of Exploration
The discovery well, Excelsior Oil, Schaffer #1, was drilled in 1957, on subsurface studies that showed that the location was on an asymmetrical structural high plunging to the southeast. This structural anomaly is part of an en echelon series of structures that trends roughly northwest-southeast. The well's initial potential was 185 barrels of oil with no water reported. Subsequent drilling discovered Lakin South in 1975.

Nature of Trap
The St. Louis reservoir is a combination structural stratigraphic trap that is producing on the down dip and east flank of a southeast plunging structural nose. The St. Louis produces primarily from the lower oolitic "C" zone with some minor contribution from an upper "A" zone. Variations in production and pressures is from a combination of structural and stratigraphic segmentations from small faults and porosity permeability variations in the St. Louis "C" oolitic shoal. The St. Louis reservoir appears to have a solution gas and partial water drive.

Lithology of the Pay Zone
The pay zone is primarily from the St. Louis "C" zone, which is an ooid-skeletal grainstone. The field complex has made over 3,736,977 barrels of oil and has averaged approximately 170,000 BO/well.

Winfield Structure
Contour Interval = 10 feet

St. Louis Structure
Contour Interval = 10 feet

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Last updated March 2002