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The AAPG/Datapages Combined Publications Database
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Abstract
Chapter from:
Abnormal
Pressures in Hydrocarbon Environments
Edited by Abnormal Pressure in Hydrocarbon Environments
Chapter 1
Abnormal Pressure in Hydrocarbon Environments
Ben E. Law1 C. W. Spencer
U.S. Geological Survey Denver, Colorado, U.S.A.
1Present Affiliation: Consulting Petroleum Geologist, Lakewood, Colorado, U.S.A.
Abstract
Abnormal pressures, pressures above or below hydrostatic pressures, occur on all
continents in a wide range of geological conditions. According to a survey of published
literature on abnormal pressures, compaction disequilibrium and hydrocarbon generation are
the two most commonly cited causes of abnormally high pressure in petroleum provinces. In
young (Tertiary) deltaic sequences, compaction disequilibrium is the dominant cause of
abnormal pressure. In older (pre-Tertiary) lithified rocks, hydrocarbon generation,
aquathermal expansion, and tectonics are most often cited as the causes of abnormal
pressure
.
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