鄂北沙漠区地震采集方法试验效果分析

AN ANALYSIS OF TEST RESULT OF THE SEISMIC ACQUISITION METHOD USED IN DESERT AREA OF NORTH E'ERDUOSI BASIN

鄂尔多斯盆地北部沙漠区浅层地震地质条件复杂 ,低降速层巨厚 ,干扰严重。上古生界目的层反射波特征为中弱振幅 ,连续性一般。以往资料信噪比和分辨率均很低 ,难以满足目前地震解释的要求。为了提高地震资料的品质 ,探索出一套适合该工区特点的地震采集方法 ,在该区进行了基础资料的调查分析和系统的激发、接收等采集因素试验 ,重新合理选择了采集参数 ,并取得了较好的采集效果。本文通过对靶区内浅层地震地质条件不同的三类地区的干扰波、虚反射等资料的分析 ,初步研究了在区内利用虚反射界面选择激发井深和根据波场特征及随机干扰的相关分析选择组合接收因素的方法原理。对比分析了试验的效果。

In the desert area of North E'erduosi Basin,the seismic and geological conditions of shallow layers are very complex and there are very thick low-velocity and slow-down layers and serious interference.The amplitude from moderate to weak and ordinary continuity are the characteristic of the reflected waves in the upper paleozoic target horizons.The existing seismic data are difficult to satisfy the need of seismic interpretation at present due to the very low signal-noise ratio and resolution.In order to imp...