Abstract：In order to solve the problem of source-locating error caused by inaccuracy of velocity model, we propose a method to locate microseismic source and simultaneously invert velocity structures with arrival times recorded at surface and borehole receivers.The traveltime derivatives with respect to velocity, layer interface depth, and microseismic event parameters are derived, and the ray paths and arrival times are calculated with the shortest path algorithm.In combination with the conjugate gradient approach, damping minimum norm and constrained least square problem are solved.Numerical test results show that the inversion algorithm can not only recover velocity structure (interval velocity and interface depth) but also locate source positions, and it is not sensitive to random noise.
张光明.水平井水力压裂数值模拟研究[学位论文].安徽合肥:中国科学技术大学,2010.Zhang Guangming.A Numerical Simulation Study on Hydraulic Fracturing of Horizontal Well[D].University of Science and Technology of China,Hefei,Anhui,2010.
[2]
Rutledge J T and Phillips W S.Hydraulic stimulation of natural fractures as revealed by induced micro-earthquakes,Carthage Cotton Valley gas field,east Texas.Geophysics,2003,68(2):441-452.
[3]
Maxwell S C,Rutledge J,Jones R et al.Petroleum reservoir characterization using downhole microseismic monitoring.Geophysics,2010,75(5):A129-A137.
[4]
容娇君,李彦鹏,徐刚等.微地震裂缝检测技术应用实例.石油地球物理勘探,2015,50(5):919-924.Rong Jiaojun,Li Yanpeng,Xu Gang et al.Fracture detection with microseismic.OGP,2015,50(5):919-924.
[5]
Li J L,Kuleli S,Zhang H J et al.Focal mechanism determination of induced microearthquakes in an oil field using full waveforms from shallow and deep seismic networks.Geophysics,2011,76(6):WC87-WC101.
[6]
张山,刘清林,赵群等.微地震监测技术在油田开发中的应用.石油物探,2002,41(2):226-231.Zhang Shan,Liu Qinglin,Zhao Qun et al.Application of microseismic monitoring technology in development of oil field.GPP,2002,41(2):226-231.
[7]
Warpinski N R,Sullivan R B,Uhi J et al.Improved microseismic fracture mapping using perforation timing measurements for velocity calibration.Proceedings of the SPE Annual Technical Conference and Exhibition,Denver,Colorado,2003,84488.
[8]
Van Dok R,Fuller B,Engelbrechet L et al.Seismic anisotropy in microseismic event location analysis.The Leading Edge,2011,30(7):766-770.
[9]
Block L V,Cheng C H,Fehler M C et al.Seismic imaging using microearthquakes induced by hydraulic fracturing.Geophysics,1994,59(1):102-112.
[10]
张晓林,张峰,李向阳等.水力压裂对速度场及微地震定位的影响.地球物理学报,2013,56(10):3552-3560.Zhang Xiaolin,Zhang Feng,Li Xiangyang et al.The influence of hydraulic fracturing on velocity and microseismic location.Chinese Journal of Geophysics,2013,56(10):3552-3560.
[11]
Song F X,Kuleli H S,Toksoz M N et al.An improved method for hydrofracture-induced microseismic event detection and phase picking.Geophysics,2010,75(6):A47-A52.
[12]
宋维琪,李艳清,刘磊.独立分量分析与压缩感知微地震弱信号提取方法.石油地球物理勘探,2017,52(5):984-989,1041.Song Weiqi,Li Yanqing,Liu Lei.Microseismic weak signal extraction based on the independent component analysis and compressive sensing.OGP,2017,52(5):984-989,1041.
[13]
王晨龙,程玖兵,尹陈等.地面与井中观测条件下的微地震干涉逆时定位算法.地球物理学报,2013,56(9):3184-3196.Wang Chenlong,Cheng Jiubing,Yin Chen et al.Microseismic events location of surface and borehole observation with reverse-time focusing using interfero-metry technique.Chinese Journal of Geophysics,2013,56(9):3184-3196.
[14]
李振春,盛冠群,王维波等.井地联合观测多分量微地震逆时干涉定位.石油地球物理勘探,2014,49(4):661-666,671.Li Zhenchun,Sheng Guanqun,Wang Weibo et al.Time-reverse microseismic hypocenter location with interferometric imaging condition based on surface and downhole multi-components.OGP,2014,49(4):661-666,671.
[15]
王鹏,常旭,王一博.基于时频稀疏性分析法的低信噪比微地震事件识别与恢复.地球物理学报,2014,57(8):2656-2665.Wang Peng,Chang Xu,Wang Yibo.Automatic event detection and event recovery in low SNR microseismic signals based on time-frequency sparseness.Chinese Journal of Geophysics,2014,57(8):2656-2665.
[16]
李稳,刘伊克,刘保金.基于稀疏分布特征下的井下微地震信号识别与提取方法.地球物理学报,2016,59(10):3869-3882.Li Wen,Liu Yike,Liu Baojin.Downhole microseismic signal recognition and extraction based on sparse distribution features.Chinese Journal of Geophysics,2016,59(10):3869-3882.
[17]
曹俊海,顾汉明,尚新民.基于局部相关谱约束的多道匹配追踪算法识别微地震信号.石油地球物理勘探,2017,52(4):704-714.Cao Junhai,Gu Hanming,Shang Xinmin.Microseismic signal identification with multichannel matching pursuit based on local coherence spectrum constraint.OGP,2017,52(4):704-714.
[18]
Grechka V,Singh P and Das I.Estimation of effective anisotropy simultaneously with locations of microseismic events.Geophysics,2011,76(6):WC141-WC155.
[19]
Li J L,Zhang H J,Rodi W L et al.Joint microseismic location and anisotropic tomography using differential arrival times and differential back azimuths.Geophy-sical Journal International,2013,195(3):1917-1931.
[20]
谭玉阳,何川,张洪亮.基于初至旅行时差的微地震速度模型反演.石油地球物理勘探,2015,50(1):54-60.Tan Yuyang,He Chuan,Zhang Hongliang.Microseismic velocity model inversion based on moveouts of first arrivals.OGP,2015,50(1):54-60.
[21]
Rutledge J T,Phillips W S and Schuessler B K.Reservoir characterization using oil-production-induced microseismicity,Clinton County,Kentucky.Tectonophysics,1998,289(1):129-152.
[22]
Bai C Y,Tang X P and Zhao R.2D/3D multiply transmitted,converted and reflected arrivals in complex layered media with the modified shortest path me-thod.Geophysical Journal International,2009,179(1):201-214.
[23]
Menke W.Geophysical Data Analysis:Discrete In-verse Theory.Academic Press Inc.,San Diego,California,1984,40-126.
[24]
Tarantola A,Valette B.Generalized non-linear inverse problems solved using the least squares criterion.Reviews of Geophysics Space Physics,1982,20(2):219-232.
[25]
Zhou B,Sinadinovski C,Greenhalgh S A.Iterative algorithm for the damped minimum norm,least-squares and constrained problem in seismic tomography.Exploration Geophysics,1992,23(3):497-505.
[26]
Rawlison N and Sambridge M S.Seismic traveltime tomography of the crust and lithosphere.Advances in Geophysics,2003,46:81-197.
