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The AAPG/Datapages Combined Publications Database

South Texas Geological Society Special Publications


Contributions to the Geology of South Texas, 1986
Pages 398-406

Recognizing Large SP Anomalies in the Cretaceous Carbonates Along the Balcones System, and How to Interpret Them

John V. Crues, Jr.


Rw calculations in the carbonate sections along the Balcones System in South Texas can be very hazardous due to the unusually large SP’s. The cause of these SP’s is probably two fold: first, the effect of the electro-kinetic SP and second, the effect of non-NaCl solutions in these formations. Either of these effects can lead to erroneous Rw values, and thus wrong Sw values.

Log examples illustrate the problems encountered in evaluating these formations for possible shows of hydrocarbons.

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