Mid-Continent Section

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Geological Evaluation of Natural Gas Sandstone in the Snyderville Shale Member, Oread Limestone Formation, Medicine Lodge-Boggs Field, Barber County, Kansas


The Medicine Lodge-Boggs Field was discovered in 1927 and produces oil, gas, and NGLs from carbonate and siliciclastic reservoirs of Ordivician through Pennsylvanian age. This study focused on a natural gas productive sandstone in the upper Snyderville Shale located the southwest part of T33S R13W, Barber County, Kansas. Ten wells that produced from sandstone in the Snyderville Shale were identified, initiating a petrophysical analysis of openhole logs combined with review of drill stem tests, mud logs, and gas chromatographs provide the basis for mapping of sandstone thickness, porosity, resistivity, hydrocarbon saturation, productivity, and structural interpretations of the reservoir. The sandstone reservoir is bound by low permeability shale which acts as a seal for trapping migrated hydrocarbons and isolating laterally correlative sandstone into isolated hydrocarbon systems. Production from the Snyderville sandstone is controlled by reservoir quality and structural attitude. In this case, natural gas that migrated into the reservoir, from deeper in the basin, became trapped in a structural anticline sealed updip as the sandstone ‘shales-out’ and sealed vertically by the Heebner Shale Formation. This study provides insight into identifying productive Snyderville sandstone reservoirs based on reservoir characterization and structural controls that may prove important in finding additional hydrocarbon reserves in Southcentral Kansas and Northern Oklahoma.