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- W2760863520 abstract "Abstract We use helium released during mechanical deformation of shales as a signal to explore the effects of deformation and failure on material transport properties. A dynamic dual‐permeability model with evolving pore and fracture networks is used to simulate gases released from shale during deformation and failure. Changes in material properties required to reproduce experimentally observed gas signals are explored. We model two different experiments of 4 He flow rate measured from shale undergoing mechanical deformation, a core parallel to bedding and a core perpendicular to bedding. We find that the helium signal is sensitive to fracture development and evolution as well as changes in the matrix transport properties. We constrain the timing and effective fracture aperture, as well as the increase in matrix porosity and permeability. Increases in matrix permeability are required to explain gas flow prior to macroscopic failure, and the short‐term gas flow postfailure. Increased matrix porosity is required to match the long‐term, postfailure gas flow. Our model provides the first quantitative interpretation of helium release as a result of mechanical deformation. The sensitivity of this model to changes in the fracture network, as well as to matrix properties during deformation, indicates that helium release can be used as a quantitative tool to evaluate the state of stress and strain in earth materials." @default.
- W2760863520 created "2017-10-20" @default.
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- W2760863520 date "2017-11-01" @default.
- W2760863520 modified "2023-10-14" @default.
- W2760863520 title "Modeling Dynamic Helium Release as a Tracer of Rock Deformation" @default.
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- W2760863520 doi "https://doi.org/10.1002/2017jb014376" @default.
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