Application Of Seismic Anisotropic AVO Inversion Method And Transplantation Of Software Modules

As people's demand for oil and gas resources gradually expands,unconventional resources such as shale oil and gas gradually attract people's attention.As a key tool for reservoir prediction and fluid identification,seismic AVO inversion can effectively extract rock physical properties from seismic response data.The traditional AVO inversion method assumes that the underground oil and gas reservoirs are isotropic,and the reservoir type is determined by inverting the reservoir elastic parameters.However,shale oil and gas reservoirs usually show significant anisotropy(vertical isotropy or VTI),and the strength of anisotropy can well predict shale reservoirs and fluid saturation,so the corresponding anisotropy is used The anisotropic inversion method can obtain reliable anisotropic parameters,which is of great significance for the quantitative interpretation of shale oil and gas reservoirs.In order to guide the future exploration and development of shale oil and gas reservoirs,based on the VTI medium AVO approximation formula proposed by Zhang et al.(2019),an anisotropic inversion method application study of seismic physical model data and actual shale gas exploration area seismic data.This paper first discusses the difference in AVO response characteristics between isotropic media and VTI media,and studies the influencing factors of AVO effects in VTI media;second,anisotropic inversion methods are carried out for forward simulation data and seismic physical model data Test;third,the application research is carried out on the actual seismic data of the Changning shale gas exploration area in Sichuan,and the applicability and reliability of the two-step three-item inversion method based on Zhang et al.(2019)approximate formula are analyzed;finally,the above The method was converted into a software module and transplanted to the Geo East software platform,the largest geophysical prospecting software platform in China.