Estimating large-scale fracture permeability of unsaturatedrockusing barometric pressure data

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We present a three-dimensional modeling study of gas flow inthe unsaturated fractured rock of Yucca Mountain. Our objective is toestimate large-scale fracture permeability, using the changes insubsurface pneumatic pressure in response to barometric pressure changesat the land surface. We incorporate the field-measured pneumatic datainto a multiphase flow model for describing the coupled processes ofliquid and gas flow under ambient geothermal conditions. Comparison offield-measured pneumatic data with model-predicted gas pressures is foundto be a powerful technique for estimating the fracture permeability ofthe unsaturated fractured rock, which is otherwise extremely difficult todetermine on the large scales of interest. In addition, this studydemonstrates ... continued below

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Wu, Yu-Shu; Zhang, Keni & Liu, Hui-Hai May 17, 2005.

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We present a three-dimensional modeling study of gas flow inthe unsaturated fractured rock of Yucca Mountain. Our objective is toestimate large-scale fracture permeability, using the changes insubsurface pneumatic pressure in response to barometric pressure changesat the land surface. We incorporate the field-measured pneumatic datainto a multiphase flow model for describing the coupled processes ofliquid and gas flow under ambient geothermal conditions. Comparison offield-measured pneumatic data with model-predicted gas pressures is foundto be a powerful technique for estimating the fracture permeability ofthe unsaturated fractured rock, which is otherwise extremely difficult todetermine on the large scales of interest. In addition, this studydemonstrates that the multi-dimensional-flow effect on estimatedpermeability values is significant and should be included whendetermining fracture permeability in heterogeneous fracturedmedia.

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  • Journal Name: Vadose Zone Journal; Journal Volume: 5; Journal Issue: 4; Related Information: Journal Publication Date: 11/2006

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  • Report No.: LBNL--57614
  • Grant Number: DE-AC02-05CH11231
  • Office of Scientific & Technical Information Report Number: 919922
  • Archival Resource Key: ark:/67531/metadc898283

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  • May 17, 2005

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  • Sept. 27, 2016, 1:39 a.m.

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  • Sept. 29, 2016, 2:34 p.m.

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Wu, Yu-Shu; Zhang, Keni & Liu, Hui-Hai. Estimating large-scale fracture permeability of unsaturatedrockusing barometric pressure data, article, May 17, 2005; Berkeley, California. (digital.library.unt.edu/ark:/67531/metadc898283/: accessed August 22, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.