多偏移距地震映像法应用技术研究

A Study of Multi-offset Seismic Imaging Method

在地震映像方法勘探中,不同偏移距获得的地震波所包含的信息是不一样的,同时,偏移距也是影响地震分辨率的一个主要因素,合理选取偏移距能取得更好的勘探效果。本文结合对向家坝至上海高压输电线路湖北咸宁段塔基岩溶地带采用浅层地震多偏移距映像勘探技术勘察的实例,应用共偏移距处理技术,抽取映像法勘探结果中不同偏移距下的多条地震剖面作对比研究,分析不同偏移距下地震波对于地质异常体的反映,探讨适合多波联合勘探的最佳接收窗口内的最佳偏移距,以提高勘探效率和精度。

In exploration of mutil - wave seismic imaging technique, the information gained from different seismic wave is not the same, by choosing suitable offsets, you can gain better exploration effects. This paper,which is based on the survey of karsts foundation of Xianning Section of the high voltage wire from Xiangjiaba to Shanghai by using mutil-wave ＆ mutil- offset superficial seismic imaging technique and by applying conjunct-offset processing technology, compares the time sections of different offsets through imaging explo-ration and analyzes the reflection of unusual geological body in reflected waves and surface waves. It explores the optimal window of offset using the multi - wave joint exploration method for the efficiency and accuracy of seismic exploration.