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The AAPG/Datapages Combined Publications Database

AAPG Bulletin


Volume: 10 (1926)

Issue: 4. (April)

First Page: 365

Last Page: 381

Title: The Subsurface Geology of the Big Lake Oil Field

Author(s): E. H. Sellards, Leroy T. Patton (1)


The paper is based on the results of the microscopic and mineralogic examination of more than one thousand samples taken from different wells in the field at varying depths from the surface. The results of these examinations were used to correct and supplement drillers' logs and a study was made of the field by use of both classes of data.

The formations are found to belong to the Permian, Triassic, and Cretaceous systems. They are described in detail and a generalized geologic column presented. It is shown that in the majority of cases the oil occurs in an oolitic dolomite, and that in all cases it occurs in strata closely related to this dolomite. The oolitic dolomite is found to have certain definite characteristics by which it may be identified in dry holes as well as in producing wells, thus furnishing a reliable and easily identifiable key horizon. It is shown that the formations contain large amounts of anhydrite, which occur up to within short distances of the producing horizon, and these deposits of anhydrite are invariably wrongly identified by the drillers as "lime," and mapping of subsurface structure by usi g the top of the "lime" as shown by the drillers' logs is more or less unreliable, especially in territory where no production is found. The structure of the field as shown by mapping on the oolitic dolomite as identified in well samples is discussed.

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