Electric Micro Imager Log At Coso Geothermal Area (2003)

GEOTHERMAL ENERGY

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Exploration Activity: Electric Micro Imager Log At Coso Geothermal Area (2003)

Exploration Activity Details
Location	Coso Geothermal Area
Exploration Technique	Single-Well and Cross-Well Resistivity
Activity Date	2003
Usefulness	not indicated
DOE-funding	Unknown

Exploration Basis

Fracture/stress analysis

Notes

A preliminary fracture/stress analysis was conducted for the recently drilled well 38C-9 as part of a continuing effort to characterize the stress state within the east flank of the Coso geothermal field. Electric Micro Imager (EMI) data were analyzed over the logged interval of 5,881-9,408 ft. Naturally occurring fractures were analyzed in order to determine both fracture dip and azimuth. Drilling induced tensile fractures were used to determine that the orientation of the maximum horizontal stress is 14⁰ + or -16⁰. However, this is approximate as the data have to be corrected for well-bore deviation.

References

• Rose, P.; Barton, C.; McCulloch, J.; Moore, J.N.; Kovac, K.; Sheridan, J.; Spielman, P.; Berard, B.   (1 January 2003) The Coso EGS Project, recent developments (in International collaboration for geothermal energy in the Americas)