Abstract

Detailed chemical analyses of 54 formation-water samples from the Frio Clay from 11 oil and gas fields in the Houston-Galveston and Corpus Christi areas, Texas, indicate that the salinity of water in the geopressured zone ranges from about 20,000 to 70,000 mg/1 dissolved solids. Samples from many gas wells yield low salinities that are not representative of the true salinity of formation water because of dilution by condensed water vapor produced with natural gas. Quartz and Na-K-Ca geothermometers are used in conjunction with the measured subsurface temperatures to identify the diluted samples and to estimate their true salinities. Better understanding of the geochemistry of geopressured geothermal waters is needed to minimize the problems associated with their use as a source of energy.

You do not currently have access to this article.