The use of fluid geochemistry to indicate reservoir processes at Cerro Prieto, MX

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Regular chemical sampling and analysis of fluids produced from the hot-water geothermal system of Cerro Prieto, Mexico has provided early warning of reservoir processes. The changes in chloride concentration, sodium to potassium ratio and measured fluid enthalpy are shown in the figures for wells M-5, M-26, M-21A, and M-11 of the Cerro Prieto field. The concentration of chloride, a ''conservative'' constituent, is characteristic of different water masses and is affected by a change of water source, by mixing of waters and by boiling and steam loss but not by reaction with rock minerals. The ratio of sodium to potassium is ... continued below

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pages 239-242

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Truesdell, Alfred H. January 1, 1978.

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Description

Regular chemical sampling and analysis of fluids produced from the hot-water geothermal system of Cerro Prieto, Mexico has provided early warning of reservoir processes. The changes in chloride concentration, sodium to potassium ratio and measured fluid enthalpy are shown in the figures for wells M-5, M-26, M-21A, and M-11 of the Cerro Prieto field. The concentration of chloride, a ''conservative'' constituent, is characteristic of different water masses and is affected by a change of water source, by mixing of waters and by boiling and steam loss but not by reaction with rock minerals. The ratio of sodium to potassium is a temperature-sensitive geothermal index resulting from rock-water reaction and is not affected by boiling and steam loss or by mixing of water masses provided these processes occur at constant temperature. The enthalpy is related to the fluid temperature and to boiling in the aquifer with ''excess'' steam entering the well. These indices provide a reasonably complete picture of major reservoir processes occurring in hot water system. Silica analyses have not been reliable from Cerro Prieto but should be used in addition to Na/K as a temperature indicator. Analysis of fluids from a producing geothermal field must of course include other constituents for study of environmental effects, scaling, corrosion, etc.

Physical Description

pages 239-242

Source

  • Proceedings fourth workshop geothermal reservoir engineering, Stanford, CA, December13-15, 1978

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  • Report No.: SGP-TR-30
  • Report No.: CONF-781222-32
  • Grant Number: None
  • Office of Scientific & Technical Information Report Number: 892545
  • Archival Resource Key: ark:/67531/metadc882840

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • January 1, 1978

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  • Sept. 21, 2016, 2:29 a.m.

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  • Dec. 2, 2016, 5:57 p.m.

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Truesdell, Alfred H. The use of fluid geochemistry to indicate reservoir processes at Cerro Prieto, MX, article, January 1, 1978; United States. (digital.library.unt.edu/ark:/67531/metadc882840/: accessed October 20, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.