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

Archer Field
T34S-R34W Sections 26,27,34,35
T35S-R34W Sections 2,11

Method of Exploration
The discovery well in the St. Louis formation for the Archer Field was the Anadarko #1 Lenehan 'A' in the SW NE Section 27-34-34W. Development of the field occurred in two phases. The initial development of the field is presumed to have been done on a combination of 2-D seismic and drilling a Winfield structural nose. The later development of the field occurred after 3-D seismic had been shot.

Nature of Trap
Production occurs in multiple shoaling events in the St. Louis formation and is associated with a south plunging structural anticline. The east side of the field is fault controlled while loss of reservoir controls the northwest side. To the east, on the down side of the fault, a Chester age incised valley is present and productive. Also, along the down side of the fault, thick Morrowan sediments were deposited and produce.

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. Fracturing is possible within the field, particularly in wells near the fault. 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