Prestack Inversion Of Eastern Shallow Layer North In Daqing Changyuan

Seismic prestack inversion technology is a hotspot in seismic attribute analysis andinversion in recent years. Prestack elastic parameter inversion can get more reservoir lithologyand imformation of fluid. Compared with the poststack inversion, prestack seismic inversionreservoir direct hydrocarbon detection.In this paper, we comparative analysised Xu-White, and Greenberg-Castagna shearwave curve construction method. We finded the method of Xu-White Model longitudinalwave velocity is more sensitive than the division of lithology.And build a technology templatewhich suit the shallow logging constrained inversion of shear wave well logs in SongliaoBasin. We build the shear correlation coefficient with the measured shear wave curve werebetween0.83-0.92, And then complete the210wells in the region of shear-wave slownesscurve, density curve and compressional wave slowness curve constructed with thismethod.By researching on the characteristics of elastic parameters of the responsediscrimination，we found the sandstone reservoirs of the district has a relatively lowlongitudinal wave impedance, density curves have a stronger ability to distinguish betweensand and shale;P-wave velocity and S-wave velocity ratio, and other elastic parameters ofthe reservoir properties have a good indication；Poisson’s ratio and the fluid factor in theregion, lithology and fluid properties are more sensitive. In addition, the shallow seismic dataquality in the area suitable for making pre-stack seismic inversion.And after Prestack gathersoptimization techniques analysis and technique of inversion results analysis，we formed a setof prestack inversion mode and workflow, the sand body in the shallow which more than2meters in line with the rate of85%or more compare with posterior well,and fluididentification with the rate not less than65%.