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The AAPG/Datapages Combined Publications Database

GCAGS Transactions

Abstract


Gulf Coast Association of Geological Societies Transactions
Vol. 31 (1981), Pages 125-133

Geology of the Subsurface Eocene Cockfield Formation in Southern Allen Parish, Louisiana

Jeff Lautier (1)

ABSTRACT

A regional study of the subsurface Cockfield Formation (Eocene) in southern Allen Parish, Louisiana, reveals that it was deposited as a result of the action of longshore currents and deltaic distributary channels within a nearshore marine environment. The juxtaposition of reservoir quality sands and marine shales within this environment created favorable conditions for the formation and entrapment of hydrocarbons. The Cockfield trend, a major oil and gas producing belt through the study region, appears to be composed mainly of fields that have combination stratigraphic-structural style entrapments. Localized sand pinch outs and permeability barriers on "rollover" anticlines that developed on the downthrown sides of faults are responsible for most accumulations. Faults evidently controlled sand deposition in some parts of the study area, resulting in thicker deposits of sand on their downthrown blocks. Thickening of section within the Cockfield is present in isolated areas and is confined to relatively short stratigraphic intervals.


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