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• W2246591425 abstract "PreviousNext No AccessSEG Technical Program Expanded Abstracts 2015The DC response of electrically conducting fractures excited by a grounded current sourceAuthors: Chester J Weiss*David F AldridgeHunter A KnoxKimberly A SchrammLewis C BartelChester J Weiss*Sandia National LaboratoriesSearch for more papers by this author, David F AldridgeSandia National LaboratoriesSearch for more papers by this author, Hunter A KnoxSandia National LaboratoriesSearch for more papers by this author, Kimberly A SchrammSandia National LaboratoriesSearch for more papers by this author, and Lewis C BartelCarbo Ceramics Inc.Search for more papers by this authorhttps://doi.org/10.1190/segam2015-5870407.1 SectionsSupplemental MaterialAboutPDF/ePub ToolsAdd to favoritesDownload CitationsTrack CitationsPermissions ShareFacebookTwitterLinked InRedditEmail Abstract We investigate through numerical simulation the usefulness of DC resistivity data for characterizing subsurface fractures with elevated electrical conductivity by considering a geophysical experiment consisting of a grounded current source deployed in a steel cased borehole. In doing so, the borehole casing behaves electrically as a spatially extended line source, efficiently energizing the fractures with a steady current. Finite element simulations of this experiment for a horizontal well intersecting a small set of vertical fractures indicate that the fractures manifest electrically in (at least) two ways: a local perturbation in the electric potential proximal the fracture set, with limited far–field expression; and, an overall reduction in the electric potential along the entire length of borehole casing due to enhanced current flow through the fractures into the surrounding formation. The change in casing potential results in a measureable effect that can be observed far from fractures themselves, at distances where the local perturbations in the electric potential around the fractures are imperceptible. Under these conditions, our results suggest that far–field, time–lapse measurements of DC potentials surrounding a borehole casing can be reasonably interpreted by simple, linear inversion for a Coulomb charge distribution along the borehole path, including a local charge perturbation due to the fractures. Such an approach offers an inexpensive method for detecting and monitoring the time-evolution of electrically conducting fractures while ultimately providing an estimate of their effective conductivity — the latter providing an important measure independent of seismic methods on fracture shape, size, and hydraulic connectivity. Keywords: finite element, fractures, resistivity, electrical/resistivity, 4DPermalink: https://doi.org/10.1190/segam2015-5870407.1FiguresReferencesRelatedDetailsCited byImaging Hydraulic Fractures Under Energized Steel Casing by Convolutional Neural NetworksIEEE Transactions on Geoscience and Remote Sensing, Vol. 58, No. 12Hydraulic Fracture Scattering Simulation by Thin Dielectric Structure-Based Higher Order Surface Integral EquationsIEEE Transactions on Geoscience and Remote Sensing, Vol. 58, No. 3Fast electrical imaging of injected fluid in hydraulic fracturing using a practical interactive parameter estimation methodYinchu Li and Dikun Yang10 August 2019The use of time-frequency domain electromagnetic (TFEM) technique to monitor hydraulic fracturingWang Zhigang, Zhang Lin, Xu jianhua, Wang Chongyang, and Liu Zihao11 December 2018The use of time-frequency domain electromagnetic technique to monitor hydraulic fracturingZhigang Wang, Gang Yu, Lin Zhang, Chongyang Wang, Jin Zhang, and Zihao Liu17 August 2017EM Exploration Complete Session17 August 20173D DC resistivity modeling of steel casing for reservoir monitoring using equivalent resistor networkDikun Yang, Douglas Oldenburg, and Lindsey Heagy1 September 2016Experiment design study in 3D DC resistivity: Adjoint sensitivities in a horizontal steel-cased boreholeChester Weiss, Hunter Knox, and David Aldridge1 September 2016Electromagnetic Methods Complete Session1 September 2016 SEG Technical Program Expanded Abstracts 2015ISSN (print):1052-3812 ISSN (online):1949-4645Copyright: 2015 Pages: 5634 publication data© 2015 Published in electronic format with permission by the Society of Exploration GeophysicistsPublisher:Society of Exploration Geophysicists HistoryPublished Online: 19 Aug 2015 CITATION INFORMATION Chester J Weiss*, David F Aldridge, Hunter A Knox, Kimberly A Schramm, and Lewis C Bartel, (2015), The DC response of electrically conducting fractures excited by a grounded current source, SEG Technical Program Expanded Abstracts : 930-936. https://doi.org/10.1190/segam2015-5870407.1 Plain-Language Summary Keywordsfinite elementfracturesresistivityelectrical/resistivity4DPDF DownloadLoading ..." @default.
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