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67th EAGE Conference & Exhibition
- Conference date: 13 Jun 2005 - 16 Jun 2005
- Location: Madrid, Spain
- Published: 13 June 2005
681 - 683 of 683 results
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A Field Invesitgation of the Permeability Dependence of Seismic Amplitudes
Authors S. S. Payne, M. H. Worthington, N. E. Odling and L. J. WestThe direct determination of permeability from seismic data is a greatly desired but still unattained goal. There has been significant recent progress due to the work of Pride and Berryman (2003a, 2003b) and Pride et al (2004). They have developed theoretical relationships for seismic attenuation resulting from wave induced fluid flow. The theory includes the case of heterogeneity in the elastic moduli at scales greater than grain sizes but smaller than wavelengths (mesoscopic scale).
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Low frequency attenuation in a saturated rock
Authors B. B. S. A. Vogelaar and D. M. J. SmeuldersHigh porosity zones bearing reservoir fluids are often interbedded with relatively impermeable lithologies. Fluids in the pores and fractures in the reservoir significantly affect the acoustic bulk characteristics, which are delineated from surface seismics, vertical seismic profiling, cross-well tomography, and sonic logging. The detected waves contain information about the rock along the wave path and the objective of all techniques is to extract this information in terms of geological structures and rock/fluid properties.
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Observation and modeling of anisotropic attenuation in VSP data
Authors S. Maultzsch, M. Chapman, E. Liu and X. -Y. LiWe analyze a range of VSP datasets for evidence of fracture related attenuation anisotropy, focusing on three attributes: P-wave attenuation anisotropy, differential shear-wave attenuation and frequency dependent shear-wave splitting. We find examples of all three phenomena and are able to reproduce the behaviour with well constrained, unified, theoretical models. Our results suggest a correlation between attenuation anisotropy and fracture properties. It is apparent that in all cases the reservoir displays much higher attenuation than the overburden. Measuring relative attenuation appears to be more robust than measuring absolute attenuation.
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