Abstract
The purpose of this paper is to make available a practical, rapid, relatively inexpensive, and reasonably accurate method of measuring cation exchange capacity (CEC) of oil‐field rocks. There is no dearth of sound, detailed descriptions of how this information should be used by explorationists to enhance their ability to interpret resistivity and SP logs in shaly sands (see references in Introduction). Waxman and Thomas (1972) have subsequently published additional information on the application to oil‐saturated shaley sands. Smits (1969) has confirmed the role of CEC in shales, a matter not considered in this paper.
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