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Self-potentialprofiling, a technique long used to locate mineral.deposits, has recently been found by various investigatorsto be an excellent tool for J.ocating and delineating buried geothermal resmvoirs in clastic ard pyroclastic environments. Laboratory experiments indicate that application of heat to the surface of various core samples result in an instantaneous generation of electric current, due to thermoelectric coupling effects which are related to conductivity contrasts within the inhomogeneousmedia. These.currentscan be detected over geothermal depositl by profiling across the boundary between normal and abnormally high heat flow.Field tests at the Slocum Oil Field, Texas, show that heat fronts,can also be establishedby self-potential profiling over an artificial geothermal reservoir--a thermal oil recovery flood. Tests have been run over shallow reservoirs Ln which both steam and fire floods a~e in progress, with significant results. Successive profiles appear to Indicate that the temper. ature distributionwithin the reservoir, as well as changes in location of the heat fro~t with time, can also be determined by this comparatively simple technique. * E 6790 M. H. DORFMAN, M. M. OS Y, ANDM. P. GADDIS c <

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