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Book Chapter

Physical and Chemical Signals Around Oil and Gas Traps

By
Sylvain J. Pirson
Sylvain J. Pirson
Consultant Austin, Texas
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Published:
January 01, 1978

Abstract

Oil and gas reservoirs in the earth are nonequilibrium dynamic systems which are never at rest over geologic time. From the early time of precipitation of organic vegetable and animal decay products within the mud and ooze of sediments, migration of organic matter occurred in a water borne transportation process as a result of sedimentary compaction and other diagenetic processes. Entrapment of organic matter in transit is visualized as occurring within upward-converging semipermeable rock strata, the hydrocarbons being retained in one or more subhorizontal spaces therein. A hydrochemical plume is formed in the vertical escape path of the transporting waters. Those ascending waters can produce such effects as mineral alteration by leaching, changes in the redox properties of the rocks, temperature anomalies, residual traces of hydrocarbons, differential compaction, vertical electrotelluric currents, near-surface electrical potential sinks, and magneto-electrotelluric effects. The latter are of special interest, as they are the basis of a versatile oil and gas exploration system bordering on direct oil finding.

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Contents

AAPG Continuing Education Course Notes Series

Physical and Chemical Constraints on Petroleum Migration

William H. Roberts, III
William H. Roberts, III
Gulf Research and Development
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Robert J. Cordell
Robert J. Cordell
Cordell Reports, Inc.
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American Association of Petroleum Geologists
Volume
8
ISBN electronic:
9781629811970
Publication date:
January 01, 1978

GeoRef

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