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AAPG Bulletin

Abstract


Volume: 64 (1980)

Issue: 5. (May)

First Page: 797

Last Page: 797

Title: Geology of Calvin Field--Deep Basinal Jurassic Play in North Louisiana Salt Basin: ABSTRACT

Author(s): James D. Voss

Article Type: Meeting abstract

Abstract:

Calvin field is currently being developed by Getty Oil Co. but was discovered in 1941 with a Paluxy gas sand completion by Hunt Oil Co. In 1972-73 Texaco drilled two Cotton Valley wildcats which were plugged and abandoned but had interesting Cotton Valley gas shows. In 1976, Getty Oil Co. (Skelly) 1 Bodcaw blew out in a Cotton Valley sand section. Getty Oil and Bodcaw Oil and Gas have established and extended production, completing seven additional wells. To date, the productive limits of the field have not been defined but considerable information is at hand, including that concerning the generally poor porosity and permeability of reservoir rock. Presently six wells, and an extension to the northeast, appear potentially productive in one or more of eight Lower Cretaceou and Upper Jurassic formations. Greatest potential appears to be in Upper Jurassic (Cotton Valley) sand section. These reservoir sands interfinger with gray marine shales over the structure and are absent off the southern flanks.

Calvin structure was formed before the close of Jurassic time on an uplifted carbonate shelf when salt movement created trough-like depressions to the northwest and southeast. The resulting faulted anticlinal feature experienced local erosion and subsequent infilling with coarse clastics brought down from the Ouachita foothills to the north and deposited in a localized deltaic environment. Marine transgression from the south immediately followed with the accumulation of extensive regional sand bars and beach deposits. The Upper Jurassic section may have been buried several thousands of feet deeper in Tertiary time than the present 12,500 to 13,000 ft (3,810 to 3,962 m).

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