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The AAPG/Datapages Combined Publications Database

AAPG Bulletin

Abstract


Volume: 64 (1980)

Issue: 5. (May)

First Page: 797

Last Page: 798

Title: Mason Lake Field, Musselshell County, Montana: ABSTRACT

Author(s): W. W. Wakefield

Article Type: Meeting abstract

Abstract:

In the Mason Lake field, the discovery of oil in the 1st Cat Creek sandstone, Lower Cretaceous in age, occurred in March 1978. Further ongoing development in the area is presently defining the limits of the field.

Discovery of the oil potential from the 1st Cat Creek sandstone occurred while development drilling to the 3rd Cat Creek sandstone was in progress. This potential had gone undetected for several wells because oil shows were absent in dry samples and rarely detectable in wet samples. The high-gravity oil (47°) may partly offer some explanation as to the unusual disappearing behavior of the oil in the dry drill cuttings. In 1964, electric-log analysis and drill-stem tests of this zone in the general area offered little evidence of potential oil production.

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Wildcat exploration for the elusive 1st Cat Creek pay zone will require detailed stratigraphic studies accompanied by careful well-site sample analysis, well-chosen suites of electric logs, and modern gas-detection equipment.

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