Permeability Estimation From Velocity Anisotropy In Fractured Rock
Name
1989.7 Gibson_Toksoz.pdf
Size
509.88 KB
Format
Adobe PDF
Checksum (MD5)
f61487f026efbef40a2d7a4eb1ceab13
Author(s)
Gibson, Richard L., Jr.
Toksoz, M. Nafi
Date Issued
1989
Publisher
Massachusetts Institute of Technology. Earth Resources Laboratory
Series/Report no.
Earth Resources Laboratory Industry Consortia Annual Report;1989-07
Abstract
Cracks in a rock mass subjected to a uniaxial stress will be preferentially closed depending on the angle between the fracture normal and the direction of the applied
stress. If the prestress fracture distribution is isotropic, the effective elastic properties of such a material are then transversely isotropic due to the preferred alignment of the cracks. Velocity measurements in multiple directions are used to invert for the probability density function describing orientations of crack normals in such a rock. We suggest a means of using the results on fracture distribution from the velocity inversion to estimate the anisotropic permeability of the fracture system. This approach yields a prediction of permeability as a function of the angle from the uniaxial stress direction.
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