Earth Tidal Analysis At Raft River Geothermal Area (1984)
Exploration Activity: Earth Tidal Analysis At Raft River Geothermal Area (1984)
|Exploration Activity Details|
|Location||Raft River Geothermal Area|
|Exploration Technique||Earth Tidal Analysis|
Determine porosity of the reservoir
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.
- Narasimhan, T.N.; Kanehiro, B.Y.; Witherspoon, P.A. (10 March 1984) Interpretation of earth tide response of three deep, confined aquifers