Comparison of dipole-dipole resistivity and electromagnetic induction sounding over the Panther Canyon thermal anomaly, Grass Valley, Nevada

Conference · Thu May 01 04:00:00 EDT 1980

OSTI ID:5354008

Wilt, M; Beyer, J H; Goldstein, N E

A comparison is made between the dipole-dipole resistivity method and electromagnetic sounding method based on surveys over a geothermal anomaly near Panther Canyon, Grass Valley, Nevada. Dipole-dipole data were taken in conjunction with large-scale geothermal studies in the area. Two orthogonal lines were measured over the heat flow anomaly and two-dimensional modeling was performed on the data. EM sounding data were taken with the Lawrence Berkeley Laboratory EM-60 system which is a large-moment, frequency-domain, horizontal-loop system. Relative to single 50-meter-radius transmitter coil, eight soundings were made with detectors at distances of 0.5 to 1.6 km from the loop. Interpreted results from the two surveys indicate substantial agreement in the depth to and thickness of a conductive zone that may be associated with the thermal anomaly. The dipole-dipole method is inherently better for resolving resistive basement beneath the conductive anomaly, and dc resistivity interpretation techniques are presently better to handle the complex two-dimensional geology. However, the EM method is far less labor intensive, requiring only one-third the field time for similar areal coverage.

• Research Organization: California Univ., Berkeley (USA). Lawrence Berkeley Lab.; Woodward-Clyde Consultants, San Francisco, CA (USA)
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 5354008
• Report Number(s): LBL-10987; CONF-800920-7
• Country of Publication: United States
• Language: English

Related Subjects

15 GEOTHERMAL ENERGY
150301* -- Geothermal Exploration & Exploration Technology-- Geophysical Techniques & Surveys
COMPARATIVE EVALUATIONS
ELECTRICAL SURVEYS
ELECTROMAGNETIC SURVEYS
EXPLORATION
GEOLOGY
GEOPHYSICAL SURVEYS
GEOTHERMAL EXPLORATION
Geothermal Legacy
HEAT FLOW
MAPPING
NEVADA
NORTH AMERICA
RESISTIVITY SURVEYS
SURVEYS
TWO-DIMENSIONAL CALCULATIONS
USA
WESTERN REGION