Models of Subsurface Rock-Water Chemical Processes ：地下岩石水化学模型的过程.pdfVIP

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Models of Subsurface Rock-Water Chemical Processes ：地下岩石水化学模型的过程.pdf

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Models of Subsurface Rock-Water Chemical Processes ：地下岩石水化学模型的过程

DOE ’s EGS Program Review vModels of Subsurface Rock-Water Chemical Processes Affecting Fluid Flow vPI, Nancy Moller; coPI, John Weare vUniversity of California, San Diego v858-534-6374; 858-534-3286 Fax: 858-5347244 vnweare@ucsd.edu; jweare@ucsd.edu July 18, 2006 Marriott Hotel Golden, CO Project Objective v Expand preliminary Al chemistry H-Na-Al-OH-Cl-H O 2 model and extend to 250ºC. Combine with our TEQUIL models that include silica and with mineral properties databases. Begin adding K system within data availability. vModified from original statement of objectives to concentrate on expanding our primary objective (1, see above), which includes T-P conditions most relevant to EGS*, and to eliminate secondary objectives (2-4) dealing with very high TP conditions (250ºC-350ºC and supercritical) and fluid inclusion analyses. *See Peer Review comments. July 18, 2006 Marriott Hotel Golden, CO EGS Problem v Chemical reactions between formation minerals and hydrothermal fluids and/or injectates can lead to changes in formation permeability. These changes can result in fluid flow problems that limit the economical production of EGS energy sources. v The chemistry of EGS resources and energy production processes is poorly characterized. v Our TEQUIL Equation of State (EOS) Pitzer models, which accurately predict gas-solid- liquid equilibria in evaporite, carbonate and silica systems to high solution concentration (I 15 m) and temperature (250°C; P˜ 1 atm), did not include the aluminum and aluminum silicate minerals that dominate hy