Abstract：The ordinary seismic trace inversion based on the hypothesis of vertical incidence of reflected P-wave can't get reliable velocity or other lithologic information, but using prestack seismic data for stack by partial angular gathers can obtain many seismic sections with AVO characters, where the S/N ratio can also be greatly improved, so partial angular stack gathers can act as basic gathers of e-lastic impedance inversion or simultaneous inversion of P- and S-wave velocities. The inversion of partial stack sections in each angular scope can result in impedance or P- and S-wave velocities values in that angular scope,but relationship between the inverted results in different angular scopes and how to compute P- and S-wave velocities values in zero-incident angle are still difficult to be solved. For that reason,the paper presented the theory using variation of seismic propagating velocities with incident angles in anisotropic media and computation of P- and S-wave velocities values of seismic wave in zero-incident angle from inverted results of P- and S-wave velocities values in different angular scopes, which realized using prestack P-wave data for simultaneous inversion of P- and S-wave velocities and further can compute ratio of P- and S-wave velocities and Poison section that can provide reliable foundation for lithologic and oil-bearing interpretation conducted by the interprers.
姜秀娣, 魏修成, 黄捍东, 王健. 利用不同角度域P波资料反演纵、横波速度[J]. 石油地球物理勘探, 2005, 40(5): 585-590.
Jiang Xiudi, Wei Xiucheng, Huang Handong, Wang Jian. Using P-wave data in different angular domains for inversion of P- and S-wave velocities. OGP, 2005, 40(5): 585-590.
