OVT域内插炮检线压制采集脚印

Acquisition footprints supersession with source and receiver line interpolation in the OVT domain

塔里木盆地塔北MS工区奥陶系目的层呈现的严重采集脚印缘于过大的炮检线距和目的层的低信噪比。为此,提出在数据处理阶段压制采集脚印的两种策略:基于常规数据规则化+四维去噪+叠后去噪技术组合,将采集脚印的压制从叠后提到叠前,但难以根除采集脚印;基于OVT域五维插值的内插炮检线技术+OVT域偏移技术,将采集脚印的压制回溯到观测系统设计阶段,即模拟炮检线距减半的现场数据采集,消除了采集脚印产生的根源,用处理技术使得采集阶段形成的脚印最小化,达到"源头控制"的效果。

Obvious footprints are seen on seismic data in Tabei MS Survey,Tarim Basin,which affects target(Ordovicion carbonate)imaging.These are caused by large source and receiver line spacing andlow signal noise ratio.This paper proposes two strategies to suppress footprints through seismic processing.One is based on combination of some techniques,such as data regularization,4D RNA,and poststack noise elimination. This method moves the footprint suppression from poststack stage to restack stage,and it cannot completely eliminate footprints.The other is based on combined both 5Dinterpolation for source and receiver lines,and migration in the OVT domain.This approach simulates seismic acquisition with half source and receiver line spacing,so it removes causes of footprints.Processing results demonstrate the validity of the proposed approach.