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《Oil Geophysical Prospecting》 2005-05
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Using P-wave data in different angular domains for inversion of P- and S-wave velocities.

Jiang Xiu-di,Wei Xiu-cheng,Huang Han-dong and Wang Jian. Jiang Xiu-di, Key Laboratory of Geophysical Prospecting (CNPC) ,University of Petroleum,Beijing City, 102249,China  
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.
【CateGory Index】: P631.4;
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