Permeability Reduction Due to Precipitation of Quartz under Nonisothermal Conditions

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Many problems concerning the origin and exploitation of geothermal reservoirs demonstrate the need for models of reactive-solute transport. Of particular interest to us is the coupling between dissolution/precipitation reactions and transient-flow behavior. In an effort to account for observed flow-rate reductions during experiments on samples of granite held in a temperature gradient (summarized at this meeting in 1981 by Moore and others), we examine the effect of quartz precipitation on fluid flow. Our results confirm earlier inerences that reactions responsible for porosity reduction were affected by kinetic factors. Although our results show substantial flow-rate reductions, we are unable to reproduce ... continued below

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239-245

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Keith, Laura A.; Delaney, Paul T. & Moore, Diane E. December 15, 1983.

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Many problems concerning the origin and exploitation of geothermal reservoirs demonstrate the need for models of reactive-solute transport. Of particular interest to us is the coupling between dissolution/precipitation reactions and transient-flow behavior. In an effort to account for observed flow-rate reductions during experiments on samples of granite held in a temperature gradient (summarized at this meeting in 1981 by Moore and others), we examine the effect of quartz precipitation on fluid flow. Our results confirm earlier inerences that reactions responsible for porosity reduction were affected by kinetic factors. Although our results show substantial flow-rate reductions, we are unable to reproduce measured silica concentrations of the outlet fluid by considering the behavior of silica phases without regard for that of the feldspars and micas.

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239-245

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  • Proceedings, Ninth Workshop Geothermal Reservoir Engineering, Stanford University, Stanford Calif., December 13-15, 1983

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  • Report No.: SGP-TR-74-30
  • Grant Number: AT03-80SF11459
  • Office of Scientific & Technical Information Report Number: 889637
  • Archival Resource Key: ark:/67531/metadc884633

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  • December 15, 1983

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  • Sept. 21, 2016, 2:29 a.m.

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  • Oct. 31, 2016, 7:03 p.m.

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Keith, Laura A.; Delaney, Paul T. & Moore, Diane E. Permeability Reduction Due to Precipitation of Quartz under Nonisothermal Conditions, article, December 15, 1983; United States. (digital.library.unt.edu/ark:/67531/metadc884633/: accessed April 21, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.