For the formation with few wells or rapid changes in sedimentary facies,it is difficult to control the spatial change trend of inversion elastic parameters by using the inversion low-frequency model established by logging curves.Based on this,this paper develops a post-stack seismic inversion method based on FWI velocity constraint,which fully uses the accurate three-dimensional information of FWI velocity.It obtains the spatial variation trend of inversion elastic parameters.For the low-frequency model of P-wave impedance required for post-stack seismic inversion,a method of converting FWI velocity to FWI P-wave impedance based on the well-logging petrophysical fitting relationship is proposed.In addition,given the differ-ence between FWI P-wave impedance and logging P-wave impedance,a correction method of FWI P-wave impedance mean val-ue is proposed,from which a more accurate low-frequency model of P-wave impedance can be obtained.The application of a single well and actual work area shows that the P-wave impedance inversion results match well with the results on the well.Therefore,the post-stack seismic inversion method based on the FWI velocity constraint proposed in this paper is more effec-tive and can provide more favorable technical support for reservoir prediction.
关键词
低频模型/FWI速度/均值校正/岩石物理/纵波阻抗/地震反演
Key words
low-frequency model/FWI velocity/mean value correction/petrophysical/P-wave impedance/seismic inversion
维普
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