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- W2086407013 abstract "Abstract The bulk compressibility of porous rocks computed from the compressional and shear slowness and the bulk density from well logs using standard dynamic moduli formulas is not the equivalent of the static compressibility measured in the laboratory under hydrostatic load because of fluid stiffness effects predicted by the Biot-Gassman-Domenico model and the fact that the reservoir is under uniaxial rather than hydrostatic stress. The method described in this paper derives a dry bulk compressibility from the wet dynamic value using the Gassman equation and reservoir parameters evaluated through log analysis. The pore-volume compressibility is then computed from the bulk and matrix compressibilities and the porosity. As this compressibility is obtained from sonic log velocities measured under uniaxial conditions of stress, field experience and laboratory measurements suggest that it is equivalent to the uniaxial compressibility, which is between one half and one-third of the hydrostatic-load value. Application of this method to a consolidated sandstone and an unconsolidated sandstone/conglomerate compare favorably with pore compressibilities measured on cores, after conversion from hydrostatic to uniaxial stress conditions." @default.
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- W2086407013 date "1996-05-01" @default.
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- W2086407013 title "Deriving Reservoir Pore-Volume Compressibility From Well Logs" @default.
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- W2086407013 doi "https://doi.org/10.2118/26963-pa" @default.
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