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The AAPG/Datapages Combined Publications Database

AAPG Special Volumes

Abstract


Pub. Id: A034 (1978)

First Page: 7

Last Page: 7

Book Title: CN 8: Physical and Chemical Constraints on Petroleum Migration

Article/Chapter: Primary Migration Agents

Subject Group: Geochemistry, Generation, Migration

Spec. Pub. Type: Course Notes

Pub. Year: 1978

Author(s): Kingi Magara

Abstract:

Four possible causes of primary hydrocarbon migration are: (a) forces resulting from sediment compaction (movement of compaction water); (b) aquathermal effect (water expansion owing to increasing temperature); (c) osmotic effect because of variation of formation-water salinity caused by ion filtration by shales; and (d) montmorillonite-illite conversion (montmorillonite dehydration). The relative importance of these causes may be related to another problem--the form of oil and gas at primary migration stage, that is, whether it is in solution in water or in its own Previous HitphaseNext Hit.

A larger proportion of migrating oil must be in its own Previous HitphaseTop because of the relatively low solubility; most of the migrating gas must be in solution in water.

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