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Measurement of aperture distribution, capillary pressure, relative permeability, and in situ saturation in a rock fracture using computed tomography scanning
Author(s) -
Bertels Stephanie P.,
DiCarlo David A.,
Blunt Martin J.
Publication year - 2001
Publication title -
water resources research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.863
H-Index - 217
eISSN - 1944-7973
pISSN - 0043-1397
DOI - 10.1029/2000wr900316
Subject(s) - capillary pressure , relative permeability , saturation (graph theory) , capillary action , materials science , wetting , permeability (electromagnetism) , in situ , composite material , water saturation , tomography , mineralogy , geology , geotechnical engineering , optics , chemistry , porous medium , porosity , organic chemistry , combinatorics , membrane , physics , biochemistry , mathematics
We develop an experimental technique that uses computed tomography (CT) scanning to provide high‐resolution measurements of aperture distribution and in situ saturation along with capillary pressure and relative permeability for the same rough‐walled fracture. We apply this technique to an induced fracture in a cylindrical basalt core undergoing water drainage. We find that the sum of the water and gas relative permeabilities is much <1 at intermediate saturations and the water relative permeability shows a sharp change over a narrow range of average water saturation. In situ saturation maps show channeling of gas and significant retention of the wetting phase (water). The capillary pressure initially increased and then decreased with decreasing water saturation. Although this type of capillary behavior is atypical for unsaturated flows, we find that the sizes of the gas‐filled apertures are consistent with the measured capillary pressure.