Simulating Injectate/Rock Chemical Interaction In Fractured Desert Peak Quartz Monzonite

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Simulations of the interactions of injected fluids with minerals within an engineered fracture in a sample of Desert Peak quartz monzonite were compared with experimental observations of fluid chemistry and fracture permeability. The observed decrease in permeability and effective hydraulic aperture was much more rapid ({approx}1.0 {micro}m/day) for a core injected with a mixed salt solution containing dissolved silica (near-saturation injectate), compared to cores injected with NaCl (far-from-saturation injectate) ({approx}0.1 {micro}m/day). Simulations were in qualitative agreement with these observations. Near-saturation injectate is predicted to result in net precipitation of secondary phases in the fracture ({approx}0.12 {micro}m/day), compared to a net ... continued below

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Viani, B; Roberts, J; Detwiler, R; Roberts, S & Carlson, S June 2, 2005.

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Simulations of the interactions of injected fluids with minerals within an engineered fracture in a sample of Desert Peak quartz monzonite were compared with experimental observations of fluid chemistry and fracture permeability. The observed decrease in permeability and effective hydraulic aperture was much more rapid ({approx}1.0 {micro}m/day) for a core injected with a mixed salt solution containing dissolved silica (near-saturation injectate), compared to cores injected with NaCl (far-from-saturation injectate) ({approx}0.1 {micro}m/day). Simulations were in qualitative agreement with these observations. Near-saturation injectate is predicted to result in net precipitation of secondary phases in the fracture ({approx}0.12 {micro}m/day), compared to a net dissolution of the rock for the far-from-saturation injectate ({approx}0.3 {micro}m/day). Permeability loss for the near-saturation-injectate is ascribed to precipitation in the fracture as well as potential dissolution of primary mineral asperities. Permeability loss for the far-from-saturation fluid is ascribed to dissolution of asperities and smoothing of the fracture. Post-test analysis of the fracture surface will be necessary to verify the processes occurring. The simplified geochemical models used do not account for mineral heterogeneity or for distributions of fluid residence times which could be important controls on permeability evolution. Further analysis is planned to explicitly account for these phenomena.

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PDF-file: 15 pages; size: 0.2 Mbytes

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  • Presented at: Geothermal Resources Council 2005 Annual Meeting, Reno, NV, United States, Sep 25 - Sep 28, 2005

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  • Report No.: UCRL-PROC-212675
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 877748
  • Archival Resource Key: ark:/67531/metadc874818

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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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  • June 2, 2005

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  • Sept. 21, 2016, 2:29 a.m.

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  • Dec. 1, 2016, 8:17 p.m.

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Viani, B; Roberts, J; Detwiler, R; Roberts, S & Carlson, S. Simulating Injectate/Rock Chemical Interaction In Fractured Desert Peak Quartz Monzonite, article, June 2, 2005; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc874818/: accessed December 16, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.