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The AAPG/Datapages Combined Publications Database

AAPG Bulletin

Abstract


Volume: 64 (1980)

Issue: 1. (January)

First Page: 107

Last Page: 114

Title: A Process for Primary Migration of Petroleum

Author(s): E. E. Bray, W. R. Foster (2)

Abstract:

Experimental data support a model migration process in which carbon dioxide and hydrocarbon gases are produced in source rocks and are dissolved in pore water concurrently with oil generation. The dissolved gases mobilize the liquid hydrocarbons so that they can leave the source rock with any water expelled during compaction. In noncompacting situations the liquid hydrocarbons can diffuse over reasonable distances from their source rocks into adjacent permeable beds. They later phase-separate by removal of carbon dioxide from the water in or near a reservoir or en route to a reservoir. Removal of carbon dioxide is accomplished by reaction with "carbon dioxide-starved" or unconditioned sedimentary rocks as the oil-bearing water moves up faults and permeable strata, or by e solution due to low pressure at shallow depths.

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