Core Holes At Long Valley Caldera Geothermal Area (Urban, Et Al., 1987)

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Exploration Activity: Core Holes At Long Valley Caldera Geothermal Area (Urban, Et Al., 1987)

Exploration Activity Details
Location Long Valley Caldera Geothermal Area
Exploration Technique Core Holes
Activity Date 1986 - 1986

Usefulness useful
DOE-funding Unknown

Exploration Basis
After several temperature-gradient holes were drilled in 1982 to the west of the resurgent dome and a geothermal lease acquisition in the western caldera by Union Oil Company (a.k.a Unocal Geothermal Division) in 1983, two test wells were drilled in the west moat that encountered reservoir temperatures > 200°C. These wells included the Research Drilling Office #8 (RDO-8) core hole drilled to 715 m depth at Shady Rest in June 1986 as a part of the DOE Continental Scientific Drilling Program (Urban et al., 1987a,b; Wollenberg et al., 1987), and the 44-16 well rotary drilled by Union Oil Company to 1,800 m depth in 1985 (Suemenicht, 1987; Suemenicht and Varga, 1988).
A temperature reversal was measured in RDO-8 at approximately 351 m depth after the well reached about 201°C, measured on June 20, 1986 during a Kuster-gage downhole temperature survey (Urban, 1987a).

Additional References