3D Multi-wave Pre-stack Inversion And Its Application

With the further development of multi-wave seismic exploration technology, more formation lithology and elastic parameters could be gotten by using multi-wave seismic data inversion, which has provided stronger evidence for the complex reservoir description. This is also one urgent research topic in the field of complex oil and gas exploration. Combined with 3D multi-wave seismic data of ken-71, this thesis studies the methods of prestack P-P affected the P-SV wave inversion and lithology and elastic parameters of three-dimensional cube by the pre-stack inversion. Combined with this area's logging data, it also analyzes AVA response characteristics and the sensitivity of elastic parameters.By comparing and explaining the inversion of the lithology and the elastic parameters, this thesis finds the correspondence relationship between inversion and reservoir parameters and verifies the accuracy of the method and inversion results. It also establishes one kind of effective processing and interpretation method of multi-wave prestack inversion, which has provided a reference for multi wave data inversion and hydrocarbon prediction.The research of this thesis has been divided into the following aspects:(1)This thesis has analyzed the theoretical basis of the inversion and introduced the physical basis of inversion of the rock. It has also discussed the relationship between the elastic parameters and AVO analysis theory and the theory of pre-stack inversion. All these have laid a solid foundation for the follow-up.(2)Combined with well logging data parameters, this thesis has forward analyzed AVA response characteristics produced by the reservoir interface in the Ken -71 region. After studying the impact of AVA by lithology and hydrocarbon, it has further studied the sensitivity of lithology and elastic parameters on the oil and gas, which laid a foundation for the explanation of inversion parameters.?(3)This thesis has completed the pre stack of the 3D multi-wave actual data in 71 Ken Region, including a series of processing such as pre-stack amplitude compensation deal, multi-wave data denoising before stack, multi-wave data NMO ,residual correction, the analysis of median filtering and multi-wave velocity and so on. After completing a series of processing, it has finally obtained the analysis of documents of NMO gathers high-resolution and speed, which laid a data base for the multi-wave inversion.(4)Based on NMO data, this thesis has converted AVO to AVA ,the converted wave angle gathers compression and matching and has extracted wavelet from P-P and P-SV wave. After the further inversion processing, it finally gets pre-stack inversion results of the multi-wave data in Ken 71, including a total of rock and elastic parameter profiles.(5)By comparing and explaining the inversion of the three-dimensional rock and the elastic parameters, this thesis analyzes the correspondence relationship between inversion and reservoir parameters and their characteristics and verifies the accuracy of the method and inversion results. It also establishes one kind of effective processing and interpretation method of multi-wave pre-stack inversion.