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The AAPG/Datapages Combined Publications Database

GCAGS Transactions

Abstract


Gulf Coast Association of Geological Societies Transactions
Vol. 25 (1975), Pages 305-314

Frio Stratigraphic Traps in Krotz Springs Field, Southwest Louisiana

Glenn H. Coffey (1)

ABSTRACT

Krotz Springs Field is an example of both a structural and stratigraphic hydrocarbon trap. The field is located in the northeastern part of St. Landry Parish in Louisiana. Well control penetrates to the Lower Wilcox. Most production in the field is taken from Frio and Cockfield sands.

The Frio is divided into Upper, Middle, and Lower by paleontological zonation. Lower Frio is mainly shale with some thin sand beds. The lithology of the Lower Frio is characterized by an increase of shale and a decrease of sand downward until the lowermost 200± feet of the Frio is massive shale, representing deposits of a marine transgression of Oligocene age.

The principal producing sands in the upper portion of the Lower Frio interval are the Nodosaria blanpiedi sands. Isopach maps of the Nodosaria blanpiedi sands indicate a channel pattern of deposition. These channel sands are thickest on the cut bank side where the channel was deepest and thinner on the point bar side where the channel shallowed.

Structure at Krotz Springs Field consists primarily of a faulted dome which is slightly elongated North and South. Production is controlled by this uplifting and the subsequent trapping of hydrocarbons in sand bodies overlain by impermeable shales. In the Nodosaria blanpiedi sands, production is also controlled by the distribution of these channel sands which are thickest on the north and east flanks of the closure.


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