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Book Chapter

Coal Deposits in Cretaceous and Tertiary Fluvial Systems of the Rocky Mountain Region

By
Romeo M. Flores
Romeo M. Flores
U.S. Geological Survey Denver, Colorado 80225
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Published:
January 01, 1985

Abstract

The exploitation of coal deposits, whether in strip mines or deep mines, is dependent upon discrete coal bodies that are thick in some places, and thin or absent in others. Over the past few decades, depositional modeling has made possible a greater understanding of the physical characteristics of coal bodies and can be used to explain (or predict) where they are thick, thin, or absent.

Depositional-environment models now available are sufficiently refined so that they can assist not only in solving prohiems in coal exploration and development, but also in mapping hydrocarbon reservoir trends. The usefulness of the concept of coal depositional modeling to petroleum exploration is based on the premise that coal bodies were deposited in an environment juxtaposed to potential hydrocarbon reservoir bodies (e.g., channel sandstone, crevasse-splay sandstone). Thus, the distribution and geometry of coal bodies can he used to predict, identify, and delineate reservoir bodies. Coal is a readily identifiable lithotype in geophysical logs, and its signature is not adversely affected by diagenesis. Because of this advantageous attribute and because of the mutual environmental association of coal and reservoir rocks, coal can he a useful tool in facies-oriented exploration. In order to better understand this method of exploration, attributes of Cretaceous and Tertiary coal-bearing deposits in fluvial systems are examined.

Cretaceous and Tertiary coals were deposited in three major environments in fluvial systems in the Rocky Mountain region: lower alluvial plain of a coastal plain-piedmont setting; upper alluvial plain of a coastal plain-piedmont setting; and intermontane alluvial plain.

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SEPM Short Course Notes

Recognition of Fluvial Depositional Systems and their Resource Potential

Romeo M. Flores
Romeo M. Flores
U.S.G.S., Denver
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Frank G. Ethridge
Frank G. Ethridge
Colo. State Univ., Fort Collins
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Andrew D. Miall
Andrew D. Miall
Univ. of Toronto, Toronto
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William E. Galloway
William E. Galloway
Bur. of Econ. Geol., Univ. of Texas, Austin
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Thomas D. Fouch
Thomas D. Fouch
U.S.G.S., Denver
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SEPM Society for Sedimentary Geology
Volume
19
ISBN electronic:
9781565762480
Publication date:
January 01, 1985

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