AUTOMATIC MICROSEISMIC EVENT DETECTION AND PICKING METHOD
ZHANG Huan-lan1, ZHU Guang-ming2, WANG Yun-hong3
1. Department of Geology and Environmental Engineering, Xi'an University of Science and Technology, Xi'an 710054, China; 2. School of Geological Engineering and Geomatics, Chang'an University, Xi'an 710054, China; 3. Xi'an Research Institute of China Coal Technology & Engineering Group Corp, Xi'an 710077, China
Abstract:Determining an accurate first arrival time of P wave and S wave is very important in locating microseismic events,and manual picking is extremely time-consuming and subjective.An automatic two-step method based on after-term average over before-term average ratio(ATA/BTA) and the Akaike Information criterion(AIC) is developed.The ATA/BTA is used to detect the event and the AIC is utilized for picking.The method can attenuate the impact of window length and improve the precision of picking.The examination of the algorithm in different window lengths and various SNR environments by using the real data proves its effectiveness and practicability.
[1] Earle P S,Shearer P M.Characterization of global seismograms using an automatic picking algorithm[J].Bulletin of the Seismological Society of America,1994,84:366-376. [2] 吴治涛,李仕雄.STA/LTA算法拾取微地震事件犘波到时对比研究[J].地球物理学进展,2010,25(5): 1577-1582. [3] 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. [4] 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. [5] 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):100-107. [6] 姚姚.用人工神经网络自动拾取地震初至[J].石油地球物理勘探,1994,29(1):112-116. [7] 潘树林,高磊,周熙襄.一种实现初至波自动拾取的方法[J].石油物探,2005,44(2):163-166. [8] 潘树林,高磊,周熙襄.基于单道边界检测和样条插值的初至波自动拾取[J].石油物探,2006,45(3):245-249. [9] St-Onge A.Akaike information criterion applied to detecting first arrival times on microseismic data[G].SEG Technical Program Expanded Abstracts,2011:1658-1662. [10] Takanami T,Kitagawa G.Estimation of the arrival times of seismic waves by multivariate time series model[J].Annals of the Institute of Statistical Mathematics,1991,43(3):407-433. [11] 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. [12] 张军华,赵勇,赵爱国,等.用小波变换与能量比方法联合拾取初至波[J].物探化探计算技术,2002,24(4):309-336. [13] Akaike H.Infromation theory and an extension of the maximum likelihood principle[C]//Second international symposium on information theory,1973:267-281. [14] Maeda N.A method for reading and checking phase times in autoprocessing system of seismic wave data[J].Zisin,1985,38(3):365-379.