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The AAPG/Datapages Combined Publications Database
Williston Basin Symposium
Abstract
NDGS/SKGS-AAPG
Fourth International Williston Basin Symposium, October 5,
GEOLOGY OF THE RAYMOND FIELD AREA, SHERIDAN COUNTY, MONTANA
ABSTRACT
The Raymond Field area is dominated by the producing structures of Raymond and Northeast Raymond Fields. The 1972 discovery well was drilled on a seismic anomaly and completed from the Winnipegosis and Red River Formations. This discovery has stimulated the drilling of 26 additional wells in the study area. The 17 productive wells have produced a total of more than 3,000,000 barrels of oil from five formations. All production is from low relief structures which were present during Ordovician time and persistent at least through Mississippian time. This structuring, combined with a Paleozoic section dominated by net regressive carbonate sequences, has allowed the formation of both primary and secondary porosity. Secondary dolomitic porosity associated with supratidal conditions is observed in the Ordovician Red River, Devonian Duperow and Devonian Nisku Formations. Primary porosity in the form of crinoidal grainstone is developed in the Mississippian Mission Canyon Formation in response to shoaling above wave base. Tectonic reactivation in the study area caused fracturing in a number of formations, notably the Devonian Winnipegosis Formation, which is productive from fractured dolomite reservoirs. In many respects, the Raymond area illustrates an attractive feature of many Williston Basin fields; that is, multiple pay horizons enhancing the economics of relatively small producing areas and making them attractive exploration targets.
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