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Argillaceous and arenaceous marker beds and lenses are common in the Frobisher-Alida interval of the Mississippian Madison. These markers are used to define "pay" zones in Bottineau, Renville, and Burke Counties. One of these regional markers is the Kisbey sandstone, also referred to as the MC-4 bed or the K-2 marker. The Kisbey sandstone has a characteristic log pattern and can be traced from southeastern Saskatchewan into north-central North Dakota. It occupies a specific stratigraphic position between the "Mohall' and "Glenburn" porosity zones and averages 15 ft (4.5 m) thick. Lithologically similar to other arenaceous units locally present within the Frobisher-Alida, the Kisbey generally is a gray to buff, medium to fine-grained, well-sorted, subangular to rounded, qu rtzose sandstone. Primary structures include lenticular bedding, ripple marks, and small-scale cross-bedding. Dolomite or anhydrite cement are also present locally.
The ability of the Kisbey to act as a reservoir rock is demonstrated by several fields in southeastern Saskatchewan and by the North Haas field in Bottineau County, North Dakota. Nineteen wells in the North Haas field produce or have produced from the Kisbey sandstone. Oil migrating through the "Glenburn" porosity in the Haas field has charged the porous and permeable Kisbey sandstone. Updip, the "Mohall" and "Glenburn" zones become progressively more anhydritic until the Kisbey is bounded above and below by anhydrite. An updip porosity loss acts as the final trapping mechanism.
The principal factor which determines the reservoir quality of the Kisbey sandstone is the presence or absence of cement or argillaceous material.
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