Abstract：The northern section of Longmen Mountain in the Sichuan Basin is a typical overthrust nappe structure with significant potential for oil and gas exploration.In order to obtain high-quality raw seismic data，it is necessary to optimize the seismic acquisition and observation system based on the results of forward modeling of the 3D model，which depends on the construction of a 3D geophysical model.To this end，based on the interpretation results of 2D and 3D seismic data，as well as near-surface survey data，different methods are used to construct geological models according to different geological and seismic reflection characteristics in different regions.Micrologging survey results and VSP data are used to assign velocity values to the model； the accuracy of the constructed 3D geophysical model is verified by using elastic wave equation simulation.The 3D geophysical model built using this method intuitively and accurately reflects the changes in nearsurface structure and underground velocity field.The simulated single-shot records are highly consistent with the actual single-shot records，providing a model basis for the argument of geometry system parameters.
王勤耕, 胡善政, 黄有晖, 杜均国, 何伟, 周鸣. 龙门山北段逆掩推覆构造三维地球物理模型构建[J]. 石油地球物理勘探, 2023, 58(6): 1359-1364.
WANG Qingeng, HU Shanzheng, HUANG Youhui, DU Junguo, HE Wei, ZHOU Ming. Construction of 3D geophysical model for overthrust nappe structure in the northern section of Longmen Mountain. Oil Geophysical Prospecting, 2023, 58(6): 1359-1364.
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