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The AAPG/Datapages Combined Publications Database

Houston Geological Society Bulletin

Abstract


Houston Geological Society Bulletin, Volume 17, No. 8, April 1975. Pages 2-2.

Abstract: The Petroleum Previous HitGeologyTop of Young Regressive Sequences

By

Richard E. Chapman

Young regressive sequences lead to abnormally pressured clays that are mechanically unstable while they are abnormally pressured, and so suffer an early deformation that is revealed by growth structures. The abnormal pressures are a consequence of under compaction, so fluid migration is retarded. This exposes more of the original pore fluids to higher temperatures and much higher pressure for a longer time. Since the mechanical instability is contemporaneous with the retarded compaction, the structural consequences precede or are contemporaneous with the migration of the bulk of the fluids. Growth structures exist before the bulk of the fluid migrates, and they exist down the migration path (down the fluid potential gradient). Petroleum accumulation in structural traps in regressive sequences is a consequence of accumulation of the regressive sequence of sediments.

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