基于最小偏移距分选的地震数据采集质量监控新方法——以沙特Berri工区三维项目为例

A new quality control method for seismic data acquisition based on sorting of minimum offset:take Berri block of Saudi Arabia as an example

(1.中国地质大学(武汉)地球物理与空间信息学院,湖北武汉430074;2.中国石油东方地球物理公司国际勘探事业部,河北涿州072751)

Institute of Geophysics and Geometics,China University of Geosciences (Wuhan),Wuhan 430074,China

在海陆过渡带三维勘探项目的野外施工过程中,通常采用常规的线性动校正或直接核对炮点的方法来检查单炮是否发生偏移,但是,这种监控手段工作效率低下且监控质量得不到保证。介绍了一种基于最小偏移距分选的地震数据采集质量监控方法,基本原理是：将初至拉平,观察是否存在初至起跳异常,从而确定是否存在炮点偏移。在沙特Berri工区三维地震数据采集过程中,首先在放炮时采用GPS导航系统,在导航系统监控软件界面上监测炮点偏移情况,初步控制炮点误差；然后利用基于最小偏移距分选方法对地震数据采集质量进行监控，并对炮点和检波点偏移误差进行分析和检查。应用结果表明该方法能精确地检查炮点和检波点偏移情况,有效地提高了地震资料采集质量。

During 3D survey in transition zone,conventional linear NMO is usually adopted or shot point is directly checked to examine single-shot drift. However,this means is inefficient and the control quality cannot be ensured. A new quality control method for seismic acquisition based on sorting of minimum drift was proposed. The basic principles are:flattening first break to examine if taking off abnormally,and to eventually identify shot-point drift. During 3D seismic data acquisition in Berri Block of Saudi Arabia,GPS navigation system was used while shooting,and monitoring shot-point drift on the interface of GPS navigation system,to initially control shot point error. Then,the method was applied to control seismic data acquisition quality,to analyze and examine shot-point drift and receiver-point drift. The results show that the method can accurately check shot-point drift and receiver-point drift,and effectively improve the seismic data acquisition quality.