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The AAPG/Datapages Combined Publications Database
Pacific Section of AAPG
Abstract
Pliocene and Pleistocene Units
The Etchegoin Formation in the Midway-Sunset Oil Field, California
Abstract
Although the Etchegoin Formation is considered to be Pliocene in age, K-Ar and 87Sr/86 dating indicates that the lower part of the formation may be of late Miocene age. Molluscan fauna and foraminiferal assemblages indicate it was deposited in shallow-marine to inter-tidal and estuarine environments. Trapping of oil in the Etchegoin is caused by the pinchout or truncation of individual sandstone members often against the flanks of anticlines. The Etchegoin Formation produced most of the first one billion barrels of Midway-Sunset’s 2.4 billion barrels of cumulative oil production indicating much future potential remains.
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