Core Holes At Long Valley Caldera Geothermal Area (Urban, Et Al., 1987)
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|
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).
- T.C. Urban, W.H. Diment, Michael L. Sorey (1987) Hydrothermal Regime of the Southwest Moat of the Long Valley Caldera, Mono County, California, and Its Relation to Seismicity--New Evidence from the Shady Rest Borehole (RD08)
- T.C. Urban, W.H. Diment, Michael L. Sorey (1987) Temperatures and Natural Gamma-Ray Logs Obtained in 1986 from Shady Rest Drill Hole RD08, Mammoth Lakes, Mono County, California
- Harold A. Wollenberg, Michael L. Sorey, Christopher D. Farrar, Art F. White, S. Flexser, L.C. Bartel (1987) A Core Hole in the Southwestern Moat of the Long Valley Caldera: Early Results
- Michael L. Sorey, Gene A. Suemnicht, Neil C. Sturchio, Gregg A. Nordquist (December 1991) New Evidence On The Hydrothermal System In Long Valley Caldera, California, From Wells, Fluid Sampling, Electrical Geophysics, And Age Determinations Of Hot-Spring Deposits