Forty-one formation-water samples from gas fields near Lafayette in southwestern Louisiana were analyzed by the U.S. Bureau of Mines to determine whether there is any difference in chemical composition between waters in normally pressured and abnormally pressured geologic intervals. The analytic data plus associated geologic data indicate that the concentration of dissolved solids in the waters is related to the degree of compaction of the adjacent shale, and that most of the samples taken from high-pressure zones are less concentrated in dissolved solids than those taken from normally pressured zones.
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Dickey et al. (1972) studied this question.
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