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Book Chapter

Iowa and Minnesota

By
Mary Combs Parker
Mary Combs Parker
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Published:
January 01, 1971

Abstract

The parts of Minnesota and Iowa included in this study comprise 165 counties which have been divided into two geologic provinces— the Sioux uplift and the Iowa shelf (U.S. Geol. Survey, 1968)—as shown in Figure 52. The Sioux uplift is considered to have negative potential for future petroleum production. The 102 counties comprising 60,000 sq mi (155,400 sq km) assigned to the Iowa shelf can be subdivided further on the basis of oil potential. The counties northeast of a line from the northwest corner of Plymouth County on the west to the northeast corner of Louisa County on the east have little potential for petroleum production. Places where Cambrian oil might be found in this area are limited to the basins which flank the Mid-Continent geophysical high (Henderson et al., 1963a, p. 20), as shown on the basement structure map (Fig. 3). These basins are fairly deep near the mafic lavas of the “high” and are shallower away from the lavas. The potential of these sand-filled basins is impossible to evaluate at this time. All counties southwest of the line described are more attractive for oil prospecting. The future potential of this area lies in the exploration of the Cambrian, post—Lower Ordovician, and basal Middle Devonian rocks. Future production of petroleum from these rocks probably will be less than production from proved petroleum provinces.

There has been only one producing oil well in Iowa—the W. F. Flynn P-l in Washington County—which produced from the lower Middle Ordovician Platteville Formation (Fig. 53). The well is near the crest of the Keota dome, now utilized by Natural Gas Pipeline Company of America for underground storage of natural gas in the St. Peter Sandstone. Total production was slightly more than 400 bbl. The well has been abandoned and now is being used as an observation well.

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Contents

AAPG Memoir

Future Petroleum Provinces of the United States—Their Geology and Potential, Volumes 1 & 2

Ira H. Cram
Ira H. Cram
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American Association of Petroleum Geologists
Volume
15
ISBN electronic:
9781629812236
Publication date:
January 01, 1971

GeoRef

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