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Influence of macro-fractures and micro-fractures on permeability and elastic wave velocities in basalt at elevated pressure

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Title: Influence of macro-fractures and micro-fractures on permeability and elastic wave velocities in basalt at elevated pressure
Authors: Nara, Yoshitaka Browse this author
Meredith, Philip George Browse this author
Yoneda, Tetsuro Browse this author →KAKEN DB
Kaneko, Katsuhiko Browse this author
Keywords: Permeability
Elastic wave velocities
Issue Date: 25-Apr-2011
Publisher: Elsevier B.V.
Journal Title: Tectonophysics
Volume: 503
Issue: 1-2
Start Page: 52
End Page: 59
Publisher DOI: 10.1016/j.tecto.2010.09.027
Abstract: Fractures are ubiquitous on all scales in crustal rocks. The investigation of fractures and their influence on physical and transport properties of rocks is therefore essential for understanding of many key problems in seismology, volcanology and rock engineering. In crystalline rocks, pore water is primarily stored in and migrates through networks of cracks and fractures at all scales. It is therefore essential to know how fluid flow in such fracture networks responds to the elevated pressures found at depth. Here, we report results from an investigation of changes in fluid permeability, and associated changes in P-wave and S-wave velocities, at elevated effective pressure for intact, macro-fractured and micro-fractured samples of Seljadur basalt. In all cases, permeability decreases and both wave velocities increase with increasing effective pressure. Permeability decreases were smallest in the intact material (from approximately 10^[-19] m2 to 3 x 10^[-20] m2), intermediate in the micro-fractured material (from approximately 5 x 10^[-17] m2 to 1 x 10^[-17] m2) and largest in the macro-fractured material (from approximately 3 x 10^[-15] m2 to 9 x 10^[-19] m2). For material containing both micro-fractures and macro-fractures, the closure of macro-fractures dominated the permeability reduction at low pressure, with the closure of micro-fractures exerting an increasing influence at higher pressure.
Type: article (author version)
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 金子 勝比古

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