High Resolution Imaging Using Crosswell Seismic with Complex Stratum in Western China

The crosswell seismic has the characteristics of high frequency and high resolution. It can provide more accurate velocity information because of its depth domain data. The crosswell seismic is known as the link of well logging, conventional 3D seismic and reservoir geology. Because the shot and geophone of crosswell-seismic are both inside the well, seismic waves avoid be attenuation of propagating through the surface with low velocity. So we can get higher quality data theoretically. In the other hand, the source of crosswell seismic usually radiates high frequency wave, which is typically several times higher than surface seismic. These features make the reflected imaging can obtain more insider information. Then we can get small sand group, which surface seismic hardly resolved. Multi-attribute parameters were extracted based on amplitude preserving imaging. Comprehensive analysis of a variety of attribution information can achieve fine structure interpretation and reservoir cognition. In this paper, we acquired three pairs of crosswell seismic data in a western China oilfield. And then data processing and corresponding geological interpretation give us good results.