The Economic Significance of the Hydrodynamic Entrapment of Petroleum

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E. C. Dahlberg

Abstract

Accumulations of oil and gas in the subsurface occur most simply in locations where the combined effects of geological (structural and lith- locations where the combined effects of geological (structural and lith ological) and hydrological (formation water, buoyancy, and flow) are optimal ological) and hydrological (formation water, buoyancy, and flow) are optimal are optimal for entrapment. Thus, the creation of an economically beneficial are optimal for entrapment. Thus, the creation of an economically beneficial hydrocarbon accumulation requires constructive contributions from the geologi- hydrocarbon accumulation requires constructive contributions from the geologi cal and the hydrological sides but in differing proportions depending upon the cal and the hydrological sides but in differing proportions depending upon the particular type of trap.