AGU Ref Shelf. Rock Physics and Phase Relations by T. Ahrens

By T. Ahrens

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Data that are important to seismic interpretation, Am. Assoc. Petr. Geol. , 26, 15,1977. , A. Nur, and D. Morgan, Effects of porosity and clay content on wave velocities in sandstones, Geophysics, J/,2093, 1986. E. F. L. Liu, and K. Hsu, Reservoir sonics: A North Sea case study, Geophysics, 57, 146, 1992. , Wave speeds and attenuation of elastic waves in material containing cracks, Geophys. J. Roy. Ast. , 64,133, 1981. , Recent developments in the acoustic properties of porous media, in Frontiers in Physical Acoustics, Course XCIII, North-Holland, Amsterdam, 1986.

Representative data from Clark et al. [21] are shown in Figure 8, where attenuation and normalized velocity are plotted as functions of water partial pressure. These data have been modeled [54. 831 as fluid monolayers lowering the surface energy of the grains and thereby reducing the cohesion and stiffness of the grain contacts. From a practical point of view, it is necessary to use Kb and Nb for the wetted,frame in Gassmann’s equations so that the chemical Several mechanisms have been identified that contribute to attenuation and velocity dispersion of acoustic waves (dispersion being the frequency dependence).

Qualitative and quantitative interpretation of fracture permeability using acoustic full-waveform logs, The Log Analyst, 32, 256, 1991. D. L. Traviolia, Attenuation by squirt flow in undersaturated gas sands, Geophysics, 45, 1780,1981. Peseinick, L. F. Outerbridge, Internal friction in shear and sher modulus of Solenhofen limestone 67. 68. 69. 70. AND MURPHY 33 over a frequency range of 10’ cycles per second, J. Geoph. , 66,581, 1961. , Acoustic character logs and their applications in formation evaluation, J.

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