L-28 ATTENUATION MEASUREMENTS FROM SURFACE SEISMIC DATA – AZIMUTHAL VARIATION AND TIME-LAPSE CASE STUDIES R. A. CLARK 1 A. J. CARTER 1 P.C. NEVILL 1 2 and P.M. BENSON 1 3 1 School of Earth Sciences University of Leeds Leeds LS2 9JT UK 2 now at: Chevron UK Ltd. 3 now at: TGS-NOPEC Geophysical Company UK 1. Introduction Quantitative knowledge of Q the seismic quality factor would be valuable both in processing and analysis of seismic reflection surveys for hydrocarbons. Intrinsic Q is a useful lithology and pore-fluid indicator; AVO data could be corrected to show reflectivity properties more accurately;


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