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Source Rocks of the La Luna Formation (Upper Cretaceous) in the Middle Magdalena Valley, Colombia

By
John E. Zumberge
John E. Zumberge
Cities Service Research, Tulsa, Oklahoma
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Published:
January 01, 1984

Abstract

Marlstone outcrops (~40–50% total carbonate content) of the Upper Cretaceous La Luna Formation in the Middle Magdalena Valley, Colombia, average 4.3 wt% total organic carbon and 2,500 ppm extractable hydrocarbons. Microscopic and elemental analyses of La Luna kerogen suggest that the organic matter in these La Luna Samples is of marine origin and at a maturity level within the oil-generation zone. Geochemical fossil distributions attest to a marine-planktonic and microorganism source, owing to abundant C27 steranes relative to C29 steranes, low quantities of C19 and C20 tricyclic diterpanes relative to extended (up to C30) tricyclic terpanes, and the presence of ubiquitous hopane triterpanes derived from bacteria.

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Contents

AAPG Studies in Geology

Petroleum Geochemistry and Source Rock Potential of Carbonate Rocks

James G. Palacas
James G. Palacas
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American Association of Petroleum Geologists
Volume
18
ISBN electronic:
9781629811642
Publication date:
January 01, 1984

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