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

Pleasant Prairie Field
T26S-34W Sections 7, 17-20, 28-33
T27S-34W Sections 3-6, 8-10, 14-16, 21,22

Method of Exploration
The discovery well was the Helmerich & Payne #0-16 Jones, located in the C W/2 Section 4-27S-34W. Initial potential was 167 barrels of oil per day with reservoir pressure of 1045 psi on drillstem test. Development of the field as based on drilling Winfield structural highs.

Nature of Trap
Production occurs in multiple shoaling events within the St. Louis formation in association with a south to southeast plunging structural anticline. This anticline is reflected at the top of the St. Louis and continues up through the Chase Group. The field is bounded on the south and west sides by a deep-seated fault, expressed as very strong folding on the Chase Group, and on the east side by an incised valley that is filled with Chesterian age clastics. Loss of shoaling bounds the northeast side of the field.

Lithology of the Pay Zone
The St. Louis formation consists of multiple shoals that are highly oolitic bounded both vertically and laterally by limestone that is dense, fine crystalline and slightly chalky. Cores indicate that fracturing, particularly in the top 50 feet of the formation, is prevalent throughout the pool. This fracturing is believed to enhance the reservoir capacity and interconnects the various shoaling events.

Winfield Structure
Contour Interval = 10 feet

St. Louis Structure
Contour Interval = 10 feet

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Last updated March 2002