STP1415: Determining the Hydraulic Properties of Saturated, Low-Permeability Geological Materials in the Laboratory: Advances in Theory and Practice

    Zhang, M
    Senior Researcher, Research Center for Deep Geological Environments, AIST, Ibaraki,

    Takahashi, M
    Senior Researcher, Research Center for Deep Geological Environments, AIST, Ibaraki,

    Morin, RH
    Geophysicist, United States Geological Survey, Mail Stop 403, Denver Federal Center, Denver, Colorado

    Endo, H
    Senior Researcher, Research Center for Deep Geological Environments, AIST, Ibaraki,

    Esaki, T
    Professor, Faculty of Engineering, Kyushu University, Fukuoka,

    Pages: 16    Published: Jan 2002


    Abstract

    The accurate hydraulic characterization of low-permeability subsurface environments has important practical significance. In order to examine this issue from the perspective of laboratory-based approaches, we review some recent advancements in the theoretical analyses of three different laboratory techniques specifically applied to low-permeability geologic materials: constant-head, constant flow-rate and transient-pulse permeability tests. Some potential strategies for effectively decreasing the time required to confidently estimate the permeability of these materials are presented. In addition, a new and versatile laboratory system is introduced that can implement any of these three test methods while simultaneously subjecting a specimen to high confining pressures and pore pressures, thereby simulating in situ conditions at great depths. The capabilities and advantages of this innovative system are demonstrated using experimental data derived from Shirahama sandstone and Inada granite, two rock types widely encountered in Japan.

    Keywords:

    low-permeability, specific storage, hydraulic gradient, constant head, constant flow rate, transient pulse, laboratory permeability tests, geologic materials


    Paper ID: STP10621S

    Committee/Subcommittee: D18.04

    DOI: 10.1520/STP10621S


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