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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 Previous HitMigrationNext Hit

Article/Chapter: Primary Previous HitMigrationNext Hit Agents

Subject Group: Geochemistry, Generation, Previous HitMigrationNext Hit

Spec. Pub. Type: Course Notes

Pub. Year: 1978

Author(s): Kingi Magara

Abstract:

Four possible causes of primary hydrocarbon Previous HitmigrationNext Hit are: (a) forces resulting from sediment compaction (movement of compaction Previous HitwaterNext Hit); (b) aquathermal effect (Previous HitwaterNext Hit expansion owing to increasing temperature); (c) osmotic effect because of variation of formation-Previous HitwaterNext Hit 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 Previous HitmigrationNext Hit stage, that is, whether it is in Previous HitsolutionNext Hit in Previous HitwaterNext Hit or in its own phase.

A larger proportion of migrating oil must be in its own phase because of the relatively low solubility; most of the migrating gas must be in Previous HitsolutionNext Hit in Previous HitwaterTop.

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