Research Of 3-Component Seismic Exploration

Multi-component seismic exploration has been research emphasis during recent decade. But most multi-component projects are just for test in local areas. Converted data processing and interpretation are the bottlenecks to limit its extensive application. Based on 3C2D seismic project in GA structure, Sichuan basin, this dissertation presents the systematical study from multi-component seismic data acquisition, processing to interpretation to try to improve the industrialized application capacity.The research includes three parts. Firstly, optimized design for multi-component exploration is developed based on the characteristics of structure, deposit and target reservoir. Shooting and receiving methods as well as the investigation of surface shear wave velocity are studied. Secondly, practical converted wave data processing workflow is studied and established including converted-wave static correction, common converted point sorting and velocity analysis. Thirdly, based on converted-wave synthetic seismogram and correlation with real data, methods of registering P-wave and PS-wave reflection section are studied. Furthermore, we integrate wells and multi-component data to summarize gas-bearing reservoir seismic responses. The method of inversion with multi-component data is discovered to predict reservoir. Finally, birefringence is studied to separate fast and slow S-wave for detecting rock fractures.After the research, application of multi-component seismic technology is improved to practical level. Optimized design workflow is established. This time, we acquired the best converted data firstly at foothill and paddy field in china. 3C2D data processing technology based on CCP stack is usable in practice. Practical velocity analysis method and shear wave statics which integrates micro-VSP method for field near surface model and structure trend surface fit statics are developed. These new data processing technologies greatly improve the converted data images which show the evident anisotropy at this area. Interpretation obtains important progress. Based on high qualitative Synthetic seismograms, we construct interpretive method to register PP- and PS-wave events and to interpret them simultaneously. We summarize the seismic responses of gas-bearing reservoir. We adopt independent inversion which inverts P-wave impedance from PP data and S-wave impedance from PS data, respectively. Consequently, some rock petrophysics parameters are obtained from the PP and PS impedance. They are used to identify lithology and fluid comprehensively. A suggested horizontal well is accepted and is drilling now. Additionally, an improved method is proposed to reduce error with joint-inversion with PP and PS data.Now, a 3C3D seismic project sponsored by CNPC is executing based on the achievement which is well accepted by Xinan Oil and Gas Company and CNPC.