高速屏蔽层下广角地震波场分析及成像方法

WIDE ANGLE SEISMIC WAVE FIELD ANALYSIS AND IMAGING METHOD BELOW THE HIGH VELOCITY SHIELD LAYERS

在高速玄武岩屏蔽区进行勘探存在一定困难 ,本文以我国南方典型靶区为例 ,提出了解决问题的方法 .首先从理论上探讨了广角地震信号存在的条件以及在应用过程中所面临的问题 .利用正演理论模型分析了广角地震信号的运动学特征以及噪声对广角反射的影响 .利用物理模型对广角地震的动力学特征、波场特征及动校拉伸现象进行了分析 .在上述基础上 ,对广角地震数据作了精细处理 。

It is difficult to explore in high velocity basalt shield area. The methods of wide angle seismic technology are put forward to solve this problem, taking a distinguish area of our country as an example. At first, the condition under which the wide angle seismic signal exists and the problems which are faced on in application have been theoretically discussed. The kinetic characteristics of the wide angle seismic signal and the effect of the wide angle reflection for noise have been analyzed by the forward theoretical model. The phenomena of the correction stretch and the characteristics of the dynamics and the wave field have been discussed in this paper. The wide angle seismic data have been processed exactly and the sub basalt seismic imaging has been achieved based on these methods.