复杂地表区偏移基准面问题研究  

Study on migration datum in complicated terrain area

作　　者：钱荣钧[1] 

机构地区：[1]石油地球物理勘探局,072751

出　　处：《石油地球物理勘探》1996年第1期41-54,166,共15页Oil Geophysical Prospecting

摘　　要：在作偏移处理时，一般要求偏移基准面是水平的，且偏移的零点应在激发和接收的地表。在高差较大的复杂地表区，很难同时满足这些要求。为了解决这一问题，本文提出以近地表斜面或圆滑曲面为偏移参考面的处理方法。然后在资料解释时再进行基准面转换，把以近地表斜面为参考面的资料转换为以某一水平面为基准面的资料。该方法简单方便，避免了地表与基准面的高差过大而引起的误差。In migration processing, we usually require that migration datum is horizontaland that zero point for migration should be on the ground surface on which shotpoint and receiving points lie. In a terribly undulate area, these requirements canhardly be met simultaneously. Hence, I put forward a new processing method inwhich near-surface slant plane or smooth curved plane is taken as migration refer-ence plane. Then, datum conversion is done in data interpretation; that is to say,the seismic data which take the near-surface slant plane as a reference plane areconverted into the seismic data which take a horizontal plane as datum. The methodis simple and avoids the errors which result from too big elevation difference be-tween ground surface and datum.

关 键 词：复杂地表 偏移 基准面 零速度层 参考面 

分 类 号：P631.4[天文地球—地质矿产勘探]