中国西部双复杂探区典型三维正演模型的建立和正演模拟

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关键词：典型模型，前陆盆地，正演模拟，双复杂探区，弹性介质，黏弹介质，各向异性 中图分类号：P631 文献标识码：A DOI：10.13810/j.cnki.issn.1000-7210.20250041

Abstract： The typical 3D numerical model and seismic simulation are of great significance for the study of seis mic processng and interpretation methods，as they can test and validate the efectiveness.of various new technologies and approaches. In the double-complex exploration areas in western China，where both neasurface and subsurface structures present significant complex，there have long been challnges of difficult seismic migration imaging and delineation of structures，making it urgent to build a typical 3D model and forward modeling data thatrepresent the double-complex characteristics of China’s foreland basins.By taking：the representative double-complex area of the Keshen block in the Kelasu area in western China as an example，this paper combines the typical surface and subsurface geological and geophysical features of foothillareas in the western foreland basins and fully utilizes data of seismic depth migration velocity，acoustic logging，VSP logging，and uphole survey to construct typical numerical models for double-complex exploration zones in western China（BGPDCGModels）. The BGP-DC²GModels include an acoustic velocity model，an isotropic elastic medium model， TTI/TORT models，and a viscoelastic medium model，typicall featuring complex near-surface conditions，complex subsurface structures，a：high-speed conglomerate fan body，salt-gypsum formations，detachment layers （coal seams），a Q anomaly，and anisotropy. Based on the BGP-DC²GModels，five sets of high-quality forward modeling data for surface and borehole 3D observation are generated by adopting the spectral-element method，

includig the isotropic acoustic wave，isotropic elastic wave，isotropic viscoelastic wave，TTI viscoelastic wave， and TORT viscoelastic wave. Additionally，the acoustic reverse time migration and anisotropic reverse time migrationresults of the data are compared and analyzed，further demonstrating that typical models and numerical simulation data can test and validate the effectiveness of new acquisition，processing，and interpretation methods.

Keywords：typical model，foreland basin，forward modeling，double-complex exploration area，elastic medium， viscoelastic medium，anisotropy

李培明，于海生，武威，等。（剩余17659字）