Elkhorn Slough Field in Solano County, California, is on the eastern flank of the Sacramento Valley, approximately 25 miles southwest of Sacramento. Grand Island Field is in Sacramento County, approximately five miles southeast of Elkhorn Slough Field (Figure 1). Both fields are between the updip edge of the Upper Winters sand pinchout and the beginning of the Winters structural play.

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The Winters pinchout play was defined with regional geologic mapping through the basin. It is turbiditic in nature, sands being transported through channels incised into the shelf and deposited into deepwater fans, surrounded by shales. The sands were...

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