The Effect of Potassium-Salt Muds on Gamma Ray, and Spontaneous Potential Measurements

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J.W. Cox, L. L. Raymer, Schlumberger

SPWLA Seventeenth Annual Logging Symposium

1976

Abstract

Interpretations of the Gamma Ray and Spontaneous Potential curves generally assume sodium chloride to be the dominant salt in both the formation water and the mud filtrate. However, potassium-salt muds are increasingly be- ing used by the oil industry. The potassium cation is significantly different CWLS Journal Vol. 9, No. 1, December 1976 35 J. W. COX & L. L. RA YMER from the sodium cation in its radioactive and electrochemical properties.

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