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《Geophysical Prospecting For Petrole》 1995-03
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Prestack wave equation depth migration of field crosshole seismic data

Liu Qinglin;et al( Research Instifute of Geophysical Prospecting for Petroleum, Nanjing 210014)  
A series of processing steps for crosshole scismic data were taken to get better migrationresults. First break timcs of P-wave and S-wavc of the data were firstly determined upon itstraveltimes, spectral analysis and wcll logging data. The data with enhanced P-wave rcflectionsand S-wave reflections were acquired through bandpass filtering and first break energy muting.We constructcd a migration ve locity modcl from tomography velocity and sonic logging data' Basedon the velocity modcl, we finally got a high rcsolution seismic imagc between two wclls aftertaking prestack wave equation depth migration. Whilc thc imaging rcgion of velocities fromtraveltime tomography is limited to the area of field survey, migration results of crossholc scismicdata not only improve exploration resolution, but enlargc our scopc to probe the earth 's interior,which give us the image beyond the region of field measurement. lf a comprchensivc data set oflithological section, logging data, VSP data and surface data is built, we can thcn form a fine andaccuratc geological model for oil and gas exploration and cxploitation.
【CateGory Index】: P631.4
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