Application Of Electrical Resistivity And Gravimetry In Deep Geothermal Exploration

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Journal Article: Application Of Electrical Resistivity And Gravimetry In Deep Geothermal Exploration

Abstract
The electrical resistivity method has been proven applicable to geothermal exploration because of the direct relationship between fluid and rock temperatures on the one hand electrical conductivity on the other. The problem of exploitation of a surface technique, such as resistivity, to the determination of geothermal gradients or 'hot spots' is complicated by the other geological parameters which affect resistivity: porosity, fluid salinity, cementation factor and clay content. However, by rational application of common geological techniques it is possible at times to isolate electrical resistivity changes due to temperature alone, and calculate the geothermal gradients. Nomograms are provided for calculation of some of the parameters which affect resistivity. Under some geologic conditions, gravimetry provides a useful clue as to the areas of abnormal heat flow, due to the metamorphism of sediments by circulating plumes of mineralized fluids. A case history of the application of the above methods to the geothermal exploration of the Imperial Valley graben of southern California is described showing how the above techniques were employed to detail the geothermal characteristics of portions of the valley.

Author 
T. Meidav








Published Journal 
Geothermics, 1970





DOI 
10.1016/0375-6505(70)90029-5


 

Citation

T. Meidav. 1970. Application Of Electrical Resistivity And Gravimetry In Deep Geothermal Exploration. Geothermics. (!) .