Earth Tidal Analysis At Raft River Geothermal Area (1984)

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Exploration Activity: Earth Tidal Analysis At Raft River Geothermal Area (1984)

Exploration Activity Details
Location Raft River Geothermal Area
Exploration Technique Earth Tidal Analysis
Activity Date 1984

Usefulness useful
DOE-funding Unknown

 
Exploration Basis
Determine porosity of the reservoir
 
Notes
The response of a confined, areally infinite aquifer to external loads imposed by earth tides is examined. Because the gravitational influence of celestial objects occurs over large areas of the earth, the confined aquifer is assumed to respond in an undrained fashion. Since undrained response is controlled by water compressibility, earth tide response can be directly used only to evaluate porous medium compressibility if porosity is known. In the present work, change in external stress is estimated from dilatation by assuming a reasonable value for bulk modulus. Earth tide response of geothermal aquifers were analyzed, and the ratio of S3 to porosity was estimated. Comparison of these estimates with independent pumping tests show reasonable agreement.

 
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