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The AAPG/Datapages Combined Publications Database

GCAGS Transactions


Gulf Coast Association of Geological Societies Transactions
Vol. 31 (1981), Pages 155-166

Petrophysical Properties of the Sligo Formation of Northern Louisiana and Arkansas

Hugh J. Mitchell-Tapping (1)


The petrophysical examination of the rock and log characteristics of the oolitic Sligo Formation (Lower Cretaceous) in Arkansas and northern Louisiana has led to new ideas in the interpretation of oolitic deposit characteristics. Thin-section and S.E.M. analyses determined four different kinds of porosity and four types of water saturation in oolite deposits. These observations were very significant in the evaluation and interpretation of this oolite reservoir. Tests were undertaken on oolite core plugs and the cementation factor (m) was determined to be 1.83, the saturation exponent (n) to be 2, and the intersect (a) to be 1. Acoustic velocity tests on core plugs showed a relationship to the cementation factor. Mercury capillary pressure tests on the oolite core plugs resulted in a new method for the interpretation of these curves. Examination of various well logs resulted in different methods of determining pay from nonpay in the Sligo Formation.

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