Oomoldic Reservoirs of Central Kansas, Controls on Porosity, Permeability, Capillary Pressure and Architecture

Kansas Geological Survey Open-file Report 2002-48

Bedding Architecture in Outcrop and Near Surface

Surface exposures and shallow cores and wireline logs in eastern Kansas provide detailed view of the architectural elements comprising L-KC ooid grainstones. Ooid shoals accumulated as lobate deposits on ramped shelves (contours on map) usually delimited by buildup of the regressive limestones containing the ooid deposits (color patterns on map). A dip-oriented cross section (A-C) along the depositional slope (inferred from an isopach map of underlying deposits) shows en echelon lobes of oolite comprising the ooid body within the upper portion of the Bethany Falls Limestone. Lobes are delineated by tight skeletal packstones, potential baffles to fluid flow. A sample of the Bethany Falls Limestone from the outcrop illustrates oomoldic pores typifying pores developed in these rocks throughout the Kansas shelf (French and Watney, 1993).

Crossbedded oolitic grainstone facies of the Drum Limestone in Hartland Quarry at Independence, Kansas. Drum Limestone is over 75 ft thick (Feldman and Franseen, 1995).

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