Schlumberger Sounding Results over the Newberry Volcano Area, Oregon

Authors: Bisdorf, Robert J.
Keywords: Exploration; Reservoir Models; Geophysical Surveys; USA; Cascades; Oregon; USGS; Logging; Measuring Devices; Geophysics; Basalt; Rhyolite; Volcanics; Models; Newberry Caldera; Resistivity
Conference: Geothermal Resources Council Transactions Session: Exploration; Reservoir modeling; Geophysical surveys; Resist
Year: 1985 Language: English
Geo Location:
Abstract: Schlumberger soundings were made in the Newberry volcano area of Oregon to categorize the electrical properties of possible Cascade geothermal system's An east-west geoelectric cross section constructed from the interpreted soundings show a low resistivity zone in the caldera, that corresponds to the increase in thermal gradient observed in the U.S. Geothermological Survey (USGS) test well. Another low resistivity zone a out 600 m deep is present just to the west of the caldera boundary. A north-south geoelectric cross section shows the configuration of the western low resistivity zone. Maps of interpreted resistivity at depths of 750 and 1000 m show that the main low resistivity area west of the caldera has two tongues, one oriented easterly and the other oriented southerly. On the 750 m depth map, the western low resistivity zone has an areal extent of about 16 km2. This zone is interesting enough that at least one company has drilled it.
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