ABSTRACT

A simple and inexpensive method of obtaining cation exchange capacity (CEC) data is presented in this paper to supplement CEC data deter-mined by routine analytical methods. The importance of CEC information in calculating water saturations from electric logs has been well established in the literature. However, CEC data is seldom used, probably due to the difficult and laborious analytical procedures commonly required to obtain this data. A correlation is established in this paper which relates cation exchange capacity to the quantity of water adsorbed on mineral surfaces at 40 to 50 per cent relative humidity. The correlation permits the evaluation of the cation exchange capacity of core samples with a very simple and an economical laboratory test procedure. The correlation was established with 186 samples from several geographical areas.

Keywords:
log analysis, correlation, wet chemistry method, well logging, water saturation, procedure, clay mineral, Symposium, core analysis, Upstream Oil & Gas
Subjects:
Formation Evaluation & Management, Open hole/cased hole log analysis, Core analysis
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1977. Society of Petrophysicists & Well Log Analysts
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