Due to the weak energy microseismic events and the characteristics of low SNR data, the quick and accurate first arrival pickup has become the key problem. In view of the low efficiency of manual pickup and the low accuracy energy ratio method in picking up first arrival, the authors proposed entropy and mutual information method. Through studying the features of random variables and correlation degree, the authors proposed a first arrival pickup based on energy and mutual information. First, energy ratio algorithm is used to pick a rough arrival time, and then the mutual information algorithm is used to accurately pick up arrival time. According to the test of the model and the analysis of real data in comparison with conventional methods, the authors effectively verify the accuracy and feasibility of the method. The automatic first arrival pickup is achieved accurately and rapidly.
秦晅, 宋维琪. 基于时窗能量比与互信息量的微地震初至拾取方法[J]. 物探与化探, 2016, 40(2): 374-379.
QIN Xuan, SONG Wei-Qi. Automatic first arrival pickup method of microseismic event based on energy ratio and mutual information. Geophysical and Geochemical Exploration, 2016, 40(2): 374-379.
[1] 叶根喜,姜福兴,杨淑华.时窗能量特征法拾取微地震波初始到时的可行性研究[J].地球物理学报,2008,51(5):1574-1581.[2] Song F,Kuleli H S,Toksoz M N,et al.An improved method for hydrofracture-induced microseismic event detection and phase picking[J]. Geophysics,2010,75(6): A47-A52.[3] 刘建华,刘福田,胥颐.三分量地震资料的偏振分析[J].地球物理学进展,2006,21(1):6-10.[4] 吴治涛,骆循,李仕雄.联合小波变换与偏振分析自动拾取微地震P波到时[J].地球物理学进展,2012,27(1):131-136.[5] 常旭, 伊克. Hausdorff分数维识别地震道初至走时[J].地球物理学报,1998,41 (6): 826-832.[6] 常旭,刘伊克.地震记录的广义分维及其应用[J].地球物理学报2002, 45(6): 839-846.[7] 陈爱萍,邹文,何光明,等.基于分维和相关性的自动初至拾取技术及应用[J].物探化探计算技术,2009,31(2): 101-107.[8] St-Onge A.Akaike information criterion applied to detecting first arrival times on microseismic data[J].SEG Technical Program Expanded Abstracts.[9] 宋维琪,吕世超.基于小波分解与Akaike信息准则的微地震初至拾取方法[J].石油物探,2011,50(1):14-21.[10] Akaike H.Infromation theory and an extension of the maximum likelihood principle.Springer Series in Statistics,1973:199-213.[11] Maeda N.A method for reading and checking phase times in autoprocessing system of seismic wave data[J].Zisin,1985,38 (3):365-379.[12] Shannon C E. A mathematical theory of communication[J].The Bell System Technical Journal, 1948, 27: 379-423 (Part I) , 625-656 (Part Ⅱ).[13] 李辉,戴旭初,葛洪魁,等. 基于互信息量的地震信号检测和初至提取方法[J]. 地球物理学报,2007,50 (4):1190-1197.[14] Hegger R, Kantz H, Schreiber T. Practical implementation of nonlinear time series methods: the TISEAN package[J].CHAOS,1999,9:413-435.