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Abstract: Geoelectrical Investigations of Boise, Idaho, Geothermal System

Previous HitPaulTop R. Donaldson, James K. Applegate

Electrical conductivity in rocks is enhanced profoundly by elevated pore-fluid temperatures. Of the potentially useful geophysical tools, this makes the electrical techniques most directly useful in delineating geothermal systems. The bipole-dipole mapping method has gained popularity in geothermal exploration because of the inherent sensitivity of the method to lateral changes in resistivity. This characteristic makes the method useful in defining certain structural controls as well as locating the boundaries of anomalously conductive regions associated with geothermal systems. The addition of a rotating-source field enhances the method sensitivity to lateral boundaries, making interpretations more straightforward.

These techniques have been helpful in the initial investigations of the Boise, Idaho, geothermal system, particularly in defining fault and fracture systems which appear to control access to the resource.

These studies were made possible by an ERDA grant.

AAPG Search and Discovery Article #90971©1976 AAPG-SEPM Rocky Mountain Sections 25th Annual Meeting, Billings, Montana