Multi-Parameter Pseudo Acoustic Full Waveform Inversion Method in Elastic World

Summary In land seismic exploration, low-velocity zone causes the ray path of reflected wave propagating to the detector perpendicularly. Therefore, single-component data is regarded as P-wave data. In this paper, we first derive a new pseudo acoustic wave equation (PAE) in elastic world based on acoustic approximation. Compared with the acoustic modeling, pseudo acoustic modeling has obvious elastic AVO effect and S-P converted energy. Then we propose a pseudo acoustic wave full waveform inversion method for elastic parameters inversion using P-wave data only. The gradients of the misfit function with respect to updating the perturbations of elastic parameters based on PAE theory are derived. A field data example in eastern china is carried out by our new method using only the p-wave data. The results of pseudo acoustic full waveform inversion shows that S-wave velocity inverted is reliable and the passion ratio profile is well fitted to the natural potential logging curve.