沙漠地区地震检波器耦合的高频信号匹配滤波技术

Match filtering of geophone coupling for high-frequencies of seismic data in desert area

1. 吉林大学地球探测科学与技术学院,吉林长春 130026;2. 中国石化华北石油局第四物探大队,河南新乡 453000

College of Geo-Exploration Science and Technology, Jilin University. Changchun 130026, China

在沙漠地区,由于常规检波器与表层干沙不能很好耦合,因此使地震资料的分辨率降低;而地震波检测系统(即特殊耦合检波器)能改善检波器与表层干沙的耦合关系,但其野外施工的效率较低。为此,利用特殊耦合检波器和常规耦合检波器在相同条件下采集的单道地震数据,采用最佳维纳滤波方法,设计了耦合匹配滤波器。应用耦合匹配滤波器对常规检波器采集的地震数据进行了处理,拓宽了叠前地震数据的频带,提高了叠加资料的分辨率,基本达到了用特殊耦合检波器采集的地震资料的品质。

In a desert area, it is difficult to couple common geo-phones with dry sands, so the resolution and signal-to-noise (S/N) ratio of seismic data deteriorate. The seismic wave detect system (SWDS) can resolve the problem, but it's efficiency is low in the field. To make good use of advantage of SWDS and heighten the efficiency, using the single trace seismic data from SWDS and common coupling receivers on equal conditions, we designed a coupling match filter by the method of Optimum Wiener Filters. Applying the filter to the shot gathers from common geophones and then the shot gathers nearly equal to that from SWDS were be acquired. The results show that the coupling match filter can broaden frequency width of the seismic shots gathers and increase the resolution and signal-to-noise ratio of stacked section.