Application of joint inversion for mapping fluid parameters

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A two-dimensional joint inversion technique, based on a least-squares criterion of the data misfit and model smoothness, has been developed using electromagnetic (EM) and seismic traveltime data to assess the feasibility of directly inverting for hydrological parameters, such as fluid electrical conductivity, porosity, and saturation. This is accomplished by relating hydrological parameters to geophysical properties with the help of the empirical Archie's law and the Wyllie time average equation. While the latter links the underground seismic wave velocity and subsurface media porosity, the former relates the bulk formation conductivity to hydrological parameters such as fluid conductivity and porosity. Direct joint ... continued below

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6 pages

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Tseng, Hung-Wen & Lee, Ki Ha September 13, 2002.

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A two-dimensional joint inversion technique, based on a least-squares criterion of the data misfit and model smoothness, has been developed using electromagnetic (EM) and seismic traveltime data to assess the feasibility of directly inverting for hydrological parameters, such as fluid electrical conductivity, porosity, and saturation. This is accomplished by relating hydrological parameters to geophysical properties with the help of the empirical Archie's law and the Wyllie time average equation. While the latter links the underground seismic wave velocity and subsurface media porosity, the former relates the bulk formation conductivity to hydrological parameters such as fluid conductivity and porosity. Direct joint inversion using various geophysical data also reduces the non-uniqueness of the problem since common parameters are involved, as is the porosity related to both seismic traveltime and magnetic field. This newly developed joint inversion algorithm has been applied to a set of crosshole seismic and EM field data provided by Chevron as part of the Lost Hills CO{sub 2} pilot project in Southern California. Both EM and seismic pre- and post-injection data were evaluated in terms of hydrological parameters using general empirical relationships derived from logging data. The results show that the injection has decreased the water saturation and bulk conductivity in the whole inter-well section. Layered structure in the region is clearly displayed and major changes in water saturation and bulk conductivity are also observed.

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6 pages

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OSTI as DE00807422

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  • The 6th SEGJ International Symposium Imaging Technology, Tokyo (JP), 01/22/2003--01/24/2003

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  • Report No.: LBNL--51494
  • Grant Number: AC03-76SF00098
  • Office of Scientific & Technical Information Report Number: 807422
  • Archival Resource Key: ark:/67531/metadc739275

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

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  • September 13, 2002

Added to The UNT Digital Library

  • Oct. 18, 2015, 6:40 p.m.

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  • April 1, 2016, 8:39 p.m.

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Tseng, Hung-Wen & Lee, Ki Ha. Application of joint inversion for mapping fluid parameters, article, September 13, 2002; Berkeley, California. (digital.library.unt.edu/ark:/67531/metadc739275/: accessed November 16, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.