Seismic phase separation technique of micro-seismic signal by polarization-position correlation
Zhu Wei-xing1, Song Wei-qi2, Xiu Jin-lei3, Zhu Xue-mei4
1. COSL Department of Oilfield Production,Sanhe City,Hebei Province,065201,China;
2. College of Earth Resource and Information,China University of Petroleum,Dongying City,Shandong Province,257061,China;
3. Room of New Exploration Zone,GRI of Shengli Oilfield,Dongying City,Shandong Province,257061,China;
4. Beijing Xinsi Software Technology Co.,Ltd.,Beijing City,100008,China
Abstract：In view of the character of seismic signal,the paper designed improved f-k filtering and presented polarization-position correlation to trace the traced component of waves in combination with adaptive polarization filtering,realizing seismic phase separation of signal. When designing the f-k filtering factor,the region of the apparent velocity in the time-window was determined by computing cross-correlation coefficient of signal in the sliding window of adjacent traces; when designing the adaptive polarization filtering factor,the paper determined the traced component of waves by computing the cross-correlation coefficient of polarization projection in adjacent traces because of uncertainty problem of waves' anticipated direction in wavefield; selecting the anticipated direction of conventional polarization filtering factor as the direction of traced component,the filtered signal was projected into traced component respectively,which achieved the seismic phase separation of signal. The theoretical model and practical data processing showed that the method is able to dramatically improve the results of signal separation.
