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Chemical logging was developed to permit identification of zones bearing geothermal water during drilling of geothermal wells. This technique consists of collection of circulation fluid samples at specified periods determined by drill-bit depth. These samples are analyzed for bicarbonate (HCO3−), Cl−, F−, Ca++, and silicon dioxide (SiO2). The results are plotted as a function of depth, and the resulting log indicates the presence of water-bearing structures. It was discovered that the ratio of Ca++ and HCO3− concentrations is a temperature indicator. It was also found that chemical composition changes precede structural changes. This report describes chemical logging of three wells at the Raft River geothermal site, Idaho.
chemical logging, geothermal, logging, geothermal drilling, scaling, corrosion
Senior chemist, E G & G Idaho, Inc., Idaho Falls, Idaho
Manager, Biological and Earth Sciences, E G & G Idaho, Inc., Idaho Falls, Idaho
Manager, Analytical Services, Exxon Nuclear Idaho Co., Inc., Idaho Falls, Idaho