Geothermal exploration by telluric currents in the Klamath Falls area, Oregon Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/mc87pv04w

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  • Geothermal resources are characterized by a very low electrical resistivity of the reservoir formations. The application of electrical methods in the reconnaissance type exploration for such resources is discussed. It is concluded that the magneto-telluric method is very well suited for this purpose. In 1971 and 1972 a reconnaissance type magneto-telluric field program was carried out in southern and eastern Oregon by the Geophysics Group at Oregon State University. In order to reduce the field effort, the magnetic data were obtained from a fixed base station at Corvallis. Only the electrical field components were measured at the various field stations. Ten stations were occupied in the Klamath Falls area, six in central and eastern Oregon and one in the Willamette Valley. Impedance data were obtained in the .025 to 0.05 Hz frequency band of the Pc 3 micropulsations. The data were analysed on the basis of an individual event method. Only magnetic-telluric events with a good correlation are taken into account. The resulting apparent resistivities display some correlation with known geothermal manifestations in the region. The lowest resistivities of the order of 10 ohm-meters were recorded in the Klamath Falls region and at a station near Vale in eastern Oregon. As common in magneto-telluric work, the data display a considerable variability, irregular scattering and anisotropy. The results are encouraging in that they appear to indicate that the magneto-telluric method is a useful reconnaissance method in the regional exploration for geothermal resources.
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