Changes in geophysical properties caused by fluid injection into porous rocks: analytical models: Geophysical changes in porous rocks

Pride, Steven R.; Berryman, James G.; Commer, Michael; Nakagawa, Seiji; Newman, Gregory A.; Vasco, Donald W.

doi:10.1111/1365-2478.12435

Changes in geophysical properties caused by fluid injection into porous rocks: analytical models: Geophysical changes in porous rocks

Journal Article · Tue Aug 30 04:00:00 EDT 2016 · Geophysical Prospecting

DOI:https://doi.org/10.1111/1365-2478.12435· OSTI ID:1379824

Pride, Steven R. ^[1]; Berryman, James G. ^[1]; Commer, Michael ^[1]; Nakagawa, Seiji ^[1]; Newman, Gregory A. ^[1]; Vasco, Donald W. ^[1]

Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Energy Geosciences Division

Analytical models are provided that describe how the elastic compliance, electrical conductivity, and fluid-flow permeability of rocks depend on stress and fluid pressure. In order to explain published laboratory data on how seismic velocities and electrical conductivity vary in sandstones and granites, the models require a population of cracks to be present in a possibly porous host phase. The central objective is to obtain a consistent mean-field analytical model that shows how each modeled rock property depends on the nature of the crack population. We describe the crack populations by a crack density, a probability distribution for the crack apertures and radii, and the averaged orientation of the cracks. The possibly anisotropic nature of the elasticity, conductivity, and permeability tensors is allowed for; however, only the isotropic limit is used when comparing to laboratory data. For the transport properties of conductivity and permeability, the percolation effect of the crack population linking up to form a connected path across a sample is modeled. But, this effect is important only in crystalline rock where the host phase has very small conductivity and permeability. In general, the importance of the crack population to the transport properties increases as the host phase becomes less conductive and less permeable.

View Accepted Manuscript (DOE)

Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)

Grant/Contract Number:: AC02-05CH11231

OSTI ID:: 1379824

Alternate ID(s):: OSTI ID: 1401012

Journal Information:: Geophysical Prospecting, Journal Name: Geophysical Prospecting Journal Issue: 3 Vol. 65; ISSN 0016-8025

Publisher:: WileyCopyright Statement

Country of Publication:: United States

Language:: English

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Changes in geophysical properties caused by fluid injection into porous rocks: analytical models: Geophysical changes in porous rocks

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