| There are abundant shale oil and gas resources in the Qijiang region of Sichuan Basin,but the fault structure is complex and the imaging is difficult.In order to speed up the process of shale gas exploration in Qijiang area,to understand the geological structure and structure of the area more realistically and objectively,to reduce exploration and drilling risks,to provide high quality seismic data processing results for subsequent geological comprehensive evaluation research,Pre-stack time migration of two-dimensional seismic data.Based on the analysis of surface conditions,surface structure,subsurface geological structure,sedimentary characteristics and the original single gun quality evaluation,the characteristics of the surface structure and deep seismic geologic conditions of the work area are summarized and summarized.Through a large number of processing technology research,repeated comparison test,in the static correction method,pre-stack interference wave suppression method,disconsolation method,stacking velocity analysis,multi-layer deep wave suppression method and other aspects of targeted treatment,Laying the foundation for pre-stack time migration.By analyzing the basic theory of Kirchhoff pre-stack time migration processing in detail,the influence of key parameters(migration aperture,migration angle,offset grouping,etc.)on complex structure imaging is discussed,and a detailed test is carried out.The pre-stack time migration and pre-stack time migration are carried out.On this basis,the results of pre-stack time migration and post-stack time migration are analyzed and compared.The results show that the results of pre-stack time migration include richer seismic information,more complex structural imaging,more reasonable spatial and spatial location of faults and breakpoints,and can better implement the structure,reflect the unconformity and different sedimentary structures Of the geological phenomenon. |
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