--> Abstract: Utility of Drill-Stem Tests in Determination of the Geothermal Regime of Railroad Valley, Nye County, Nevada, by D. E. French; #90959 (1995).
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Abstract: Utility of Previous HitDrillNext Hit-Previous HitStemNext Hit Previous HitTestsNext Hit in Determination of the Geothermal Regime of Railroad Valley, Nye County, Nevada

Don E. French

Accurate representation of geothermal Conditions is necessary to determine generation potential of source rocks buried in Railroad Valley. Boreholes provide the best source of geothermal information, but Previous HitformationNext Hit temperature data must be screened for variations caused by drilling. Bottomhole temperatures Previous HitfromNext Hit wireline logs are affected by initial Previous HitformationNext Hit conditions, drilling Previous HitfluidNext Hit that moves into the Previous HitformationNext Hit while drilling, and lag time between cessation of drilling Previous HitfluidNext Hit circulation and acquisition of logs. More accurate indicators of Previous HitformationNext Hit conditions are temperatures recorded during Previous HitdrillNext Hit-Previous HitstemNext Hit Previous HittestsNext Hit, especially for Previous HittestsNext Hit that recovered large amounts of Previous HitfluidNext Hit.

Over 130 Previous HitdrillNext Hit-Previous HitstemNext Hit Previous HittestsNext Hit were examined to establish the viability of this source of data and to determine the geothermal conditions of the Railroad Valley basin. Results indicate that 500 feet or more of Previous HitfluidNext Hit recovery on a test is necessary to get a temperature recorded that is not influenced by drilling perturbations. The Previous HitformationTop temperature data collected for Railroad Valley indicate the possibility of 2 thermal regimes. A low-temperature gradient regime is probably influenced by meteoric water. The high-temperature gradient regime probably reflects the regional heat flow associated with the thin crust of the Great Basin.

AAPG Search and Discovery Article #90959©1995 AAPG Rocky Mountain Section Meeting, Reno, Nevada