Abstract
Abstract This paper presents the history of exploration and development on the nose of the Thornton arch as specifically related to the West Thornton and Walnut Grove gas fields. These fields are in the east-central part of the Delta area of the Sacramento basin. The Delta area is within the general boundaries described by the latitude of the city of Sacramento on the north, the Sierran foothills on the east, the Mount Diablo foothills on the south, and the eastern foothills of the California Coast Ranges on the west. A thick Tertiary and Paleocene clastic section, which is absent because of thinning and truncation in the rest of the Sacramento basin, underlies the Delta area. Gas is trapped in these rocks by combinations of folding, faulting, and abrupt facies changes. Structural traps are predominant. Rio Vista, a complexly faulted dome is in the center of the Delta area directly west of the West Thornton and Walnut Grove fields. It is the largest gas field in the Sacramento basin, with estimated original reserves of more than 3 trillion cu ft.
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