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The AAPG/Datapages Combined Publications Database

AAPG Bulletin

Abstract


Volume: 15 (1931)

Issue: 3. (March)

First Page: 229

Last Page: 246

Title: Cretaceous Limestone as Petroleum Source Rock in Northwestern Venezuela

Author(s): Hollis D. Hedberg (2)

Abstract:

Stratigraphic relations between the La Luna and Cogollo limestones of Cretaceous age in northwestern Venezuela are discussed. Both formations are somewhat petroliferous. The lithology, microscopic character, and occurrence of oil in the two formations are compared in detail. The conclusion is that oil in the La Luna limestone is indigenous, whereas that in the Cogollo has migrated into the rock from some other source. Analyses and simple tests of the La Luna rock indicate further the probability that it is, or has been, a source rock of petroleum. The specific source of the oil-generating material in the La Luna sediment is discussed from the viewpoint of what is known of the present composition of the rock and what may be inferred as to its original environment of deposi ion.

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