纵波与转换波的横向分辨率比较

Comparison of lateral resolution between PP-wave and PS-wave

在多分量地震勘探中,纵波(PP波)与转换波(PS波)的横向分辨率高低一直没有得到系统的研究。本文就煤田多分量地震勘探中PP波与PS波的横向分辨率与转换点位置、纵横波速度比、炮检距、界面深度以及品质因子等影响因素的关系进行了讨论,并对煤田实际资料进行了处理,结果表明在一般情况下,PS波的横向分辨率要高于PP波,纵横波速度比和品质因子比对PP波和PS波的横向分辨率之比值影响较大,界面深度较浅以及炮检距较大时对横向分辨率之比值影响较大。这一结论可对多分量地震勘探的观测系统设计以及处理解释提供新的依据。

The lateral resolution of longitudinal wave(PP-wave)and converted wave(PS-wave)is not clear yet in the present multi-component seismic exploration.In this paper,the relationships of lateral resolution between PP-wave and PS-wave with conversion point position,velocity ratio of P-wave to S-wave,offset,interface depth and quality factors are discussed based on seismic multi-component data acquired in a coal field.The results show that the lateral resolution of PS-wave is better than that of PP-wave in general.Besides,the velocity ratio and quality factors have a greater influence on the lateral resolution ratio of PP-wave and PSwave.And shallow interfaces and long offsets have also a greater influence on it.These observations may be helpful for geometry design,data processing and interpretation in the multi-component seismic exploration.