弹性波的叠前相移偏移

Phase-shift migration of prestack elastic wave data.

目前,弹性波成像仍处于研究阶段。本文根据声波相移偏移的思想,实现了弹性波资料的相移偏移。该方法先从单分量位移弹性波方程出发,导出基于位移场的相移偏移公式。然后,借助时-空域的纵、横波分离结果,实现了位移场的弹性波叠前相移偏移。另外,文中对互相关成像法和时间成像法进行了对比试验。试验结果表明,两种成像方法的效果相当,但时间成像法的效率较高。

Elastic wave image remains in research stage.Phase-shift migration of elastic wave data is based on phase-shift migration of acoustic wave data.First,phase-shift migration formula based on displacement field is derived from elastic wave equation of single component in displacement field.Then,phase-shift migration of prestack elastic wave data in displacement field is achieved with the aid of seperating com- pressional wave from shear wave in time-space domain. Crosscorrelation imaging is compared with time imaging.The comparison shows that time imaging is more efficient than crosscorrelation imaging,with their results equivalent.