Study On Structure Interpretation And Inversion Method Of Liu Wushe Area In Gaoyou Sag

This paper studied the method of reservoir inversion prediction accuracy in Liuwushe area of Gaoyou Sag,summarized the key technologies and explore effective high-precision seismic inversion method of sandstone and mudstone thin interbed.Applying high-precision inversion technology in Liuwushe area,the reservoir characterization accuracy of thin sand body is effectively improved.Through research,the following four main results were achieved:1.Research on The reflection characteristics of the main reflectors,the method of small fault identification,Summary of structural styles and main fault structural evolution characteristics in this area was carried out.The forward model was used to analyze the profile characteristics of different levels of faults,and then the small faults are effectively identified by section identification,coherence and slicing techniques.2.A set of logging data quality control processing technology was established for high precision inversion and the calibration,correction and standardization of logging data were mainly completed for more than 30 wells in deep sag.According to the actual petrophysical characteristics of the research area,the petrophysical modeling method is selected to estimate the transverse wave,which provides accurate data for pre-stack inversion.Pre-stack sensitive elastic parameters were analyzed,providing a basis for quantitative interpretation of pre-stack seismic inversion and lithological characterization.3.Several optimizing processes were applied to the pre-stack CRP gathers,such as high-resolution processing,pre-stack denoising and residual time difference correction,and a reasonable pre-stack gather optimization process was established.Firstly,well control deconvolution was used to broaden the effective frequency band of seismic data,and then the denoising and residual time difference correction are carried out,which finally improves the quality of the original seismic data.4.A complete series of high-precision seismic inversion techniques were established and the optimization methods for key parameters were clarified.Two different inversion methods were applied to high-precision 3D seismic data in Liu wushe area,and fine reservoir inversion prediction was carried out.With comparison and verification of different methods,key parameter optimization method is summarized,which improves reservoir characterization accuracy and reduces multiplicity.