Estimating permeability from quasi-static deformation: Temporal variations and arrival time inversion

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Transient pressure variations within a reservoir can be treated as a propagating front and analyzed using an asymptotic formulation. From this perspective one can define a pressure 'arrival time' and formulate solutions along trajectories, in the manner of ray theory. We combine this methodology and a technique for mapping overburden deformation into reservoir volume change as a means to estimate reservoir flow properties, such as permeability. Given the entire 'travel time' or phase field, obtained from the deformation data, we can construct the trajectories directly, there-by linearizing the inverse problem. A numerical study indicates that, using this approach, we can ... continued below

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Vasco, D.W.; Ferretti, Alessandro & Novali, Fabrizio May 1, 2008.

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Transient pressure variations within a reservoir can be treated as a propagating front and analyzed using an asymptotic formulation. From this perspective one can define a pressure 'arrival time' and formulate solutions along trajectories, in the manner of ray theory. We combine this methodology and a technique for mapping overburden deformation into reservoir volume change as a means to estimate reservoir flow properties, such as permeability. Given the entire 'travel time' or phase field, obtained from the deformation data, we can construct the trajectories directly, there-by linearizing the inverse problem. A numerical study indicates that, using this approach, we can infer large-scale variations in flow properties. In an application to Interferometric Synthetic Aperture (InSAR) observations associated with a CO{sub 2} injection at the Krechba field, Algeria, we image pressure propagation to the northwest. An inversion for flow properties indicates a linear trend of high permeability. The high permeability correlates with a northwest trending fault on the flank of the anticline which defines the field.

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63

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  • Journal Name: Geophysics; Related Information: Journal Publication Date: 2008

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  • Report No.: LBNL-310E
  • Grant Number: DE-AC02-05CH11231
  • Office of Scientific & Technical Information Report Number: 940394
  • Archival Resource Key: ark:/67531/metadc897489

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  • May 1, 2008

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  • Sept. 27, 2016, 1:39 a.m.

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  • Sept. 29, 2017, 4:22 p.m.

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Vasco, D.W.; Ferretti, Alessandro & Novali, Fabrizio. Estimating permeability from quasi-static deformation: Temporal variations and arrival time inversion, article, May 1, 2008; Berkeley, California. (digital.library.unt.edu/ark:/67531/metadc897489/: accessed October 21, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.