地震记录中的转换波

在一些隆起区的水平叠加时间剖面上，常常出现倾斜短同相轴，呈条带分布;而在单炮记录的远炮检距位置上，于正常反射波之后，出现视速度较低的同相轴。经计算确认，这些是转换波。转换波的存在，严重地降低了记录的信噪比。消除这类转换波的措施有:1.资料采集时要有足够的排列长度和覆盖次数;2.处理时运用叠后二维滤波和多次波消去法。文中给出的实际资料，充分地证明了这样做是行之有效的。

Converted waves in seismic record

Some oblique short events often appear in narrow zones on CDP time section crossing structurally domed area, and some low velocity events follow the normal reflections on the far traces of single cover records.Identified by computations, all such events are considered as converted waves, which severely decrease S/N ratio of seismic records.The measure for eliminating converted waves is to use proper long spread and sufficient folds of multiple coverage in data acquisition, and to adopt 2D filtering after stacking and the method for eliurinating multiples in data processing.This measure proved highly effective.