摘要
可控震源的滑动扫描方式通过多组震源实现在时间上的重叠扫描,可大大缩短每次数据采集的平均时间从而提高生产效率。但与常规扫描方式不同,由滑动扫描得到的多震源的合成地震记录存在着相互混叠。因此滑动扫描地震勘探的核心问题是如何选取合适的滑动时间,既能缩短每次数据采集的平均时间,又能尽量减少将合成地震记录分离成常规的单组震源记录中存在的混叠。以最常用的线性扫描信号为例,从理论上分析了滑动扫描地震记录信号分离的原理,讨论了各组记录之间存在相互混叠的原因,并指出为了能有效地进行信号分离,选取两组震源之间最小滑动时间和减少混叠的方法。
By using several groups of vibrator overlaping scanning in time,the slip-scanning mode of vibrators could decrease the average cycle time of each datum acquisition and increase productivity significantly. The key problem of slip-scanning mode is how to select slip-time that can shorten the average cycle time of each datum acquisition as well as reduce signal aliasing when separating the compound records of multi-groups of vibrators into a record of single-group of vibrators. As an example,this paper analyzes signal separating principle for slip scanning seismic records in theory with most commonly used linear scanning signal. It discusses the causes of producing aliasing between records of each group of vibrators and points out the minimum slip-time between two groups of vibrators in order to separate the signal efficiently as well methods for decreasing signal aliasing .
出处
《石油天然气学报》
CAS
CSCD
北大核心
2009年第2期50-52,58,共4页
Journal of Oil and Gas Technology
基金
中国石油天然气集团公司石油科技中青年创新基金项目(2008D-4006-03-07)
关键词
可控震源
滑动扫描
信号分离
卷积
vibrator
slip-scanning
signal separation
convolution
correlation
