Oxygen And Carbon Isotope Studies Of Calcite From The Cerro Prieto Geothermal Field

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Journal Article: Oxygen And Carbon Isotope Studies Of Calcite From The Cerro Prieto Geothermal Field

Abstract
The inferences derived from oxygen and carbon isotope data for calcite samples from the Cerro Prieto geothermal field depend on the sample type. The Δ18O values for calcite in sandstone provide a reliable basis for estimating stable reservoir temperatures and the Δ18O values for calcite in shale can be related to the extent and spatial distribution of subsurface flow. The Δ18O values for vein calcite record short-lived polythermal fracture-filling episodes at temperatures that may differ from those in the adjacent stable reservoir. The oxygen isotope data for shales indicate a minimum water - rock volume ratio of 2:1. Even this high flow was greatly exceeded in sandstones, with the result that the reservoir fluids are isotopically well-mixed and of relatively low salinity.

Author 
E. R. Olson








Published Journal 
Geothermics, 1979





DOI 
Not Provided
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Citation

E. R. Olson. 1979. Oxygen And Carbon Isotope Studies Of Calcite From The Cerro Prieto Geothermal Field. Geothermics. (!) .