Hydraulic-fracturing shear-tensile microseismic focal mechanism moment tensor inversion
TANG Jie1,2, WEN Lei1,2, LI Cong1,2, QI Ruixuan1,2
1. School of Geosciences, China University of Petroleum(East China), Qingdao, Shandong 266580, China;
2. Laboratory for Marine Mineral Resources, Qingdao National Laboratory for Marine Science and Technology, Qingdao, Shandong 266071, China
Abstract:Due to limited receivers,small monitoring angles,and a single measure direction in a well,focal positioning and focal mechanism analyses based on microseismic monitoring signals in wells are not accurate enough.So a hydraulic-fracturing focal mechanism calculation with P-wave first-motion amplitude inversion is proposed.The moment tensor inversion uses P-wave and S-wave particle motion equations in uniform elastic medium to calculate Green's functions.Based on tests of the proposed method on model data,the following understanding is obtained:①Isotropic (ISO) components are not sensitive to errors compared with compensated linear vector dipole (CLVD) components when using the full moment tensor inversion.This is because ISO components are linear functions of moment tensor eigenvalues when the moment tensor is decomposed,but CLVD components are nonlinear functions;②The acquisition geometry is very important for inversion results of non-double-coupled (non-DC) components.An appropriate acquisition geometry increases the credibility of seismic moment tensor DC and non-DC component analysis;③The geometric distribution and the type of rupture mechanism can be observed from radiation patterns.Radiation patterns of different focal types have some differences.The limited focal sphere coverage will bring multiple solutions to the inversion.
赵邦六,董世泰,曾忠.井中地震技术的昨天、今天和明天——井中地震技术发展及应用展望[J].石油地球物理勘探,2017,52(5):1112-1123.ZHAO Bangliu,DONG Shitai,ZENG Zhong.Borehole seismic development,status quo and future:Application prospect of borehole seismic[J].Oil Geophysical Prospecting,2017,52(5):1112-1123.
方兵,孙成禹,唐杰,等.微地震信号频率特性分析[J].石油地球物理勘探,2015,50(3):411-417.FANG Bing,SUN Chengyu,TANG Jie,et al.Analysis of frequency characteristics of micro-seismic signals[J].Oil Geophysical Prospecting,2015,50(3):411-417.
[4]
唐杰,王浩,温雷,等.剪张型微地震震源机制与振幅分布特征[J].石油地球物理勘探,2018,53(3):502-510.TANG Jie,WANG Hao,WEN Lei,et al.Focal me-chanism of shear-tensile microseismic and amplitude distribution characteristics[J].Oil Geophysical Prospecting,2018,53(3):502-510.
[5]
Vavryuk V.Inversion for parameters of tensile earthquakes[J].Journal of Geophysical Research,2001,106(8):16339-16355.
[6]
Urbancic T,Baig A.How microseismic data from over a decade of cyclic steaming stimulations can yield insight into a heavy oil reservoir?[C].75th EAGE Conference & Exhibition-Workshops,2013.
[7]
杨心超,朱海波,崔树果,等.P波初动震源机制解在水力压裂微地震监测中的应用[J].石油物探,2015,54(1):43-50.YANG Xinchao,ZHU Haibo,CUI Shuguo,et al.Application of P-wave first-motion focal mechanism solutions in microseismic monitoring for hydraulic fracturing[J].Geophysical Prospecting for Petroleum,2015,54(1):43-50.
[8]
杨心超,朱海波,李宏,等.基于P波辐射花样的压裂微地震震源机制反演方法研究及应用[J].石油物探,2016,55(5):640-648.YANG Xinchao,ZHU Haibo,LI Hong,et al.Microseismic focal mechanism inversion based on P-wave radiation pattern and its application[J].Geophysical Prospecting for Petroleum,2016,55(5):640-648.
[9]
翟鸿宇,常旭,王一博.含衰减地层微地震震源机制反演及其反演分辨率[J].地球物理学报,2016,59(8):3025-3036.ZHAI Hongyu,CHANG Xu,WANG Yibo.Inversion for microseismic focal mechanisms in attenuated strata and its resolution[J].Chinese Journal of Geophy-sics,2016,59(8):3025-3036.
[10]
Vavryuk V.Inversion for the composite moment tensor[J].Bulletin of the Seismological Society of Ame-rica,2015,105(6):3024-3035.
[11]
Foulger G R,Julian B R,Hill D P,et al.Non-double-couple microearthquakes at Long Valley caldera,California,provide evidence for hydraulic fracturing[J].Journal of Volcanology and Geothermal Research,2004,132(1):45-71.
[12]
Pesicek J D,Cieślik K,Lambert M.Dense surface seismic data confirm non-double-couple source mechanisms induced by hydraulic fracturing[J].Geophy-sics,2016,81(6):207-217.
[13]
Lizurek G.Full moment tensor inversion as a practical tool in case of discrimination of tectonic and anthropogenic seismicity in Poland[J].Pure and Applied Geophysics,2016,174(1):197-212.
[14]
Kuang W,Zoback M,Zhang J.Estimating geomecha-nical parameters from microseismic plane focal me-chanisms recorded during multistage hydraulic fracturing[J].Geophysics,2017,82(1):1-11.
[15]
Jost M L,Herrmann R H.A student's guide to and review of moment tensors[J].Seismological Research Letters,1989,60(2):37-57.
[16]
Stierle E,Vavryčuk V,ŠílenÝ J,et al.Resolution of non-double-couple components in the seismic moment tensor using regional networks-1:A synthetic case study[J].Geophysical Journal International,2014,196(3):1869-1877.
[17]
Stierle E,Vavryuk V,Kwiatek G,et al.Seismic moment tensors of acoustic emissions during laboratory rock deformation experiments:sensitivity to attenuation and anisotropy[J].Geophysical Journal International,2016,205(1):38-50.
[18]
Knopoff L,Randall M J.The compensated linear-vector dipole:A possible mechanism for deep earthquakes[J].Journal of Geophysical Research,1970,75(26):1957-1963.
[19]
Hudson J,Pearce R,Roberts R.Source type plot for inversion of the moment tensor[J].Journal of Geophysical Research,1989,94(1):765-774.
[20]
Grechka V,Li Z,Howell B,et al.Single-well moment tensor inversion of tensile microseismic events[J].Geophysics,2016,81(6):219-229.
[21]
刁瑞,吴国忱,尚新民,等.地面微地震有源噪声自动识别与匹配压制方法[J].石油地球物理勘探,2018,53(2):311-319.DIAO Rui,WU Guochen,Shang Xinmin,et al.Microseismic active noise automatic identification and ma-tching denoising[J].Oil Geophysical Prospecting,2018,53(2):311-319.
[22]
余洋洋,梁春涛,康亮,等.微地震地面监测系统的优化设计[J].石油地球物理勘探,2017,52(5):974-983.YU Yangyang,LIANG Chuntao,KANG Liang,et al.Design optimization of surface-based microseismic monitoring system for hydraulic fracturing[J].Oil Geophysical Prospecting,2017,52(5):974-983.
[23]
Li J L,Zhang H J,Kuleli H S,et al.Focal mechanism determination using high-frequency waveform ma-tching and its application to small magnitude induced earthquakes[J].Geophysical Journal International,2011,184(3):1261-1274.
[24]
Tan Y Y,Zhang H J,Li J L,et al.Focal mechanism determination for induced seismicity using the neighbourhood algorithm[J].Geophysical Journal International,2018,214(3):1715-1731.
[25]
唐杰,方兵,孙成禹,等.压裂诱发的微地震震源机制及信号传播特性研究[J].石油地球物理勘探,2015,50(4):643-649.TANG Jie,FANG Bing,SUN Chengyu,et al.Study on focal mechanism of micro-seismic induced by hydrofracture and signal propagation characteristics[J].Oil Geophysical Prospecting,2015,50(4):643-649.