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Occurrence and geochemistry of natural gases, Piceance Basin, northwest Colorado

American Association of Petroleum Geologists Bulletin

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Abstract

The Piceance Basin is a hydrocarbon-rich province that has natural gas production from reservoirs ranging in age from Late Jurassic to Eocene and large undeveloped resources of natural gas in coal beds and tight sandstone reservoirs of Cretaceous age. Gases from all producing intervals are of predominantly thermal origin and become isotopically heavier and chemically drier with increasing thermal maturity of reservoirs. Based on chemical and isotopic composition, three major types of gases can be distinguished: those generated from mixed type II and III kerogens, those from dispersed type III kerogen, and those from coal. A fourth, distinct type of isotopically light thermogenic gas occurs in immature reservoirs of the Eocene Green River Formation. This gas is inferred to have migrated from unidentified deeper, more mature source rocks. -from Authors

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Occurrence and geochemistry of natural gases, Piceance Basin, northwest Colorado
Series title:
American Association of Petroleum Geologists Bulletin
Volume
74
Issue:
6
Year Published:
1990
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
American Association of Petroleum Geologists Bulletin
First page:
805
Last page:
829
Number of Pages:
25