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Title: Stable isotope systematics of oxygen and carbon in rocks and minerals from the Cerro Prieto geothermal anomaly, Baja California, Mexico

Abstract

Rock samples from a total of 50 drillholes in the Cerro Prieto geothermal area have been analysed by stable isotopic techniques. In particular, calcite in cuttings and core samples from these wells has been analysed to observe systematic variations in carbon (delta/sup 13/C) and oxygen (delta/sup 18/C) isotopic compositions. Consistent behaviours of these isotopic systems are observed and provide a large amount of information on the processes of calcite - water isotopic equilibration, dissolution precipitation and decarbonation occurring within and around the reservoir. Oxygen isotopic profiles of intergranular calcites in sandstones appear to be a reliable measure of the equilibrium temperature distribution in the field before production began. From these data, a detailed three-dimensional map has been developed. showing the equilibrium temperatures in the geothermal field. Of particular importance are many examples of temperature reversals at depth beneath the hot geothermal reservoir. Reversals of this sort provide strong constraints on the directions of fluid flow and the overall dynamics of the circulation systems.

Authors:
;
Publication Date:
Research Org.:
Univ. of California, Riverside, CA
OSTI Identifier:
6240064
Resource Type:
Journal Article
Resource Relation:
Journal Name: Geothermics; (United States); Journal Volume: 13:1
Country of Publication:
United States
Language:
English
Subject:
15 GEOTHERMAL ENERGY; CALCITE; ISOTOPE RATIO; CERRO PRIETO GEOTHERMAL FIELD; GEOTHERMAL WELLS; RESERVOIR TEMPERATURE; DRILL CORES; CHEMICAL COMPOSITION; CARBON; DECARBONIZATION; DISSOLUTION; GEOPHYSICAL SURVEYS; GEOTHERMAL FLUIDS; MINERALS; NATURAL OCCURRENCE; OXYGEN; PRECIPITATION; QUANTITATIVE CHEMICAL ANALYSIS; RESERVOIR ROCK; SANDSTONES; TEMPERATURE DISTRIBUTION; ALKALINE EARTH METAL COMPOUNDS; CALCIUM CARBONATES; CALCIUM COMPOUNDS; CARBON COMPOUNDS; CARBONATE MINERALS; CARBONATES; CHEMICAL ANALYSIS; ELEMENTS; FLUIDS; GEOTHERMAL FIELDS; NONMETALS; OXYGEN COMPOUNDS; ROCKS; SEDIMENTARY ROCKS; SEPARATION PROCESSES; SURVEYS; WELLS; 150202* - Geology & Hydrology of Geothermal Systems- Non-USA- (-1989); 150302 - Geothermal Exploration & Exploration Technology- Geochemical Techniques & Surveys

Citation Formats

Williams, A.E., and Elders, W.A. Stable isotope systematics of oxygen and carbon in rocks and minerals from the Cerro Prieto geothermal anomaly, Baja California, Mexico. United States: N. p., 1984. Web. doi:10.1016/0375-6505(84)90006-3.
Williams, A.E., & Elders, W.A. Stable isotope systematics of oxygen and carbon in rocks and minerals from the Cerro Prieto geothermal anomaly, Baja California, Mexico. United States. doi:10.1016/0375-6505(84)90006-3.
Williams, A.E., and Elders, W.A. Sun . "Stable isotope systematics of oxygen and carbon in rocks and minerals from the Cerro Prieto geothermal anomaly, Baja California, Mexico". United States. doi:10.1016/0375-6505(84)90006-3.
@article{osti_6240064,
title = {Stable isotope systematics of oxygen and carbon in rocks and minerals from the Cerro Prieto geothermal anomaly, Baja California, Mexico},
author = {Williams, A.E. and Elders, W.A.},
abstractNote = {Rock samples from a total of 50 drillholes in the Cerro Prieto geothermal area have been analysed by stable isotopic techniques. In particular, calcite in cuttings and core samples from these wells has been analysed to observe systematic variations in carbon (delta/sup 13/C) and oxygen (delta/sup 18/C) isotopic compositions. Consistent behaviours of these isotopic systems are observed and provide a large amount of information on the processes of calcite - water isotopic equilibration, dissolution precipitation and decarbonation occurring within and around the reservoir. Oxygen isotopic profiles of intergranular calcites in sandstones appear to be a reliable measure of the equilibrium temperature distribution in the field before production began. From these data, a detailed three-dimensional map has been developed. showing the equilibrium temperatures in the geothermal field. Of particular importance are many examples of temperature reversals at depth beneath the hot geothermal reservoir. Reversals of this sort provide strong constraints on the directions of fluid flow and the overall dynamics of the circulation systems.},
doi = {10.1016/0375-6505(84)90006-3},
journal = {Geothermics; (United States)},
number = ,
volume = 13:1,
place = {United States},
year = {Sun Jan 01 00:00:00 EST 1984},
month = {Sun Jan 01 00:00:00 EST 1984}
}