我国陆上转换波质量评价

Appreciation of land converted wave quality in China

目前影响我国陆上三分量地震勘探广泛开展的一个重要原因是,人们普遍认为采集得到的转换波的能量和信噪比较低。但通过对近年来在我国一些工区所采集的三分量地震资料进行分析发现,共检波点道集上转换波同相轴清楚,连续性较好,这表明采集得到的转换波的能量和信噪比均比较高。因此,在转换波资料处理中,转换波静校正是一个很重要的问题,尤其是横波静校正量的计算。 基于对部分现有资料的分析,本文认为不能仅用共炮点道集来评价转换波资料的品质,还应采用共检波点道集来进行评价。分析结果表明,对于井中激发的地震资料而言,共检波点道集上纵波同相轴的连续性优于共炮点道集上纵波同相轴的连续性。

An important factor that influences at present on wide development of our land 3-C seismic prospecting is that people widely considered that acquired converted wave has lower energy and signal-to-noise ratio. After analysis, the paper considered that appreciation of converted wave data quality is not only from common shot gather, but also from common receiver gather .Through analysis on 3-C seismic data acquired in our work area in recent years, we discovered that converted wave event is clear and good continuity on common receiver gather which show a strong energy and a high signal-to-noise ratio in acquired converted wave. And at the same time, it shows that an important problem is that good statics for converted wave (especially its calculation) are needed in converted wave data processing. The analysis also shows that the continuity of P-wave event on common receiver gather is superior to that on common shot gather for seismic data acquired by shooting in shot hole.