近地表复杂结构下的静校正边界效应探讨

在地震资料处理过程中,由于地形和低速带、降速带起伏变化,以及野外采集施工方法等因素的影响,应用初至波静校正方法计算静校正量,对炮点以外的检波点无法获取有效延迟时间及近地表模型,这就意味着不能得到准确的静校正量,在地震资料处理中产生边界效应。提出了在无炮点覆盖的检波点区域内,按照一定间隔的炮点距(需要参考表层厚度)增加激发点,弥补初至波静校正对边界延迟时间计算中的缺陷,提高复杂近地表结构模型的准确性,消除边界效应在地震资料处理中所产生的中、长波静校正量不准的现象,以最大限度地满足精细勘探需求。

Approach to Static Correction Edge Effect Under Near-Surface Complex Configuration

In seismic data processing,the effective delay time and near-surface model in receiver without shot are hardly received when computing the static correction from first arrival reflection due to relief variation of landform,low-velocity layer and subweathered layer as well as influence of field acquisition and operating methods.This means that the uncorrected static corrections may cause edge effect.This paper suggests that in receiver area without shot coverage,such a method can farthest meet the requirement for fine seismic prospecting as increasing shot point by some-interval shooting distance(need to refer to the surface layer thickness) in order to remedy the edge delay time defects in first arrival reflection computation,thus enhancing the accuracy of complex near-surface structural model,eliminating the improper medium-long wave static correction phenomenon caused by the edge effect in seismic data processing.