快慢波分离及其在裂隙检测中的应用

Separation of fast wave from slow wave and its application to fracture detection.

快慢波分离技术是多波处理中的一项关键性技术 ,利用分离后快慢波的偏振方位和时差可以对地下裂缝的发育状况进行研究。以往的快慢波分离方法在抗噪性、准确性等方面有诸多不足之处 ,本文从径向分量与横向分量的旋转分量出发 ,推出了自相关函数与互相关函数之间的关系 ,并据此建立了一个预测函数 ,通过扫描得到正确的偏振方位和分裂时差。多层各向异性模型试算表明该方法的正确性 ,实际资料处理也取得了明显效果。

The separation of fast wave from slow wave is one key technique in multiwave processing. The polarization azimuths of fast wave and slow wave, and their moveout may be used to detect and analyse formation fractures. Previous methods for separating fast wave from slow wave have some defects in noise resistance, accuracy and so on. This method works in the following procedure: ·Deduce the relation between autocorrelation function and crosscorrelation function of radial component and transverse component. ·Derive prediction function from the relation. ·Obtain accurate polarization azimuth and moveout by sweeping. The trial computation of multilayer anisotropy model proves this method right, and real data processing has brought obvious effect.