Research And Application Of VSP Ray-tracing Modeling And Processing Methods

VSP Method is a seismic survey technology in wells. Compared with surface seismic technology, VSP has a higher signal/noise ratio and resolution, and its waves'motive and dynamic characteristics are more conspicuous. VSP technology provides a most directly corresponding relationship between underground stratum structures and surface survey parameters. It can provide precise time-depth conversion and velocity model for processing and interpretation of surface seismic data. It can exactly identify geologic stratum of seismic reflection and improve the interpretation effect of surface seismic data. We can even do a research on lithology and physical property of reservoir by use of VSP data. Thus, VSP is a promising seismic survey technology.Effected by field survey method, seismic wave information on gathered VSP data is quite different from that on surface seismic profiles and what is most different is that there are up-going and down-going waves on VSP profiles. This difference decides that VSP processing is different from surface seismic data and what is most different is that VSP dada must have a processing stage of wave-filed separation and then we can do VSP data interpretation and inversion by use of down-going and up-going wave information respectively. Besides wave-field separation, VSP processing also has many other special steps. Pointed to VSP data, to research processing methods and form reasonable processing flows is quite important to improve processing quality. To some extent, researches on VSP processing methods can even improve processing and interpretation quality of surface seismic data.Based on PC-VSP processing system, my thesis researches forward modeling and data processing. To some extent, forward modeling is for data processing, namely providing modeling VSP records as the primary input of data processing. In data processing part, we introduce the common VSP processing flow in one chapter and do lots of processing in another chapter, including processing of modeling and field...