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Comparison of Single-Well Microseismic Focal Mechanism Inversions with Different Source Models

文献类型：期刊论文

作者Li, Han2,3; Chang, Xu2,3; Hao, Jinlai1,2; Wang, Yibo2,3
刊名BULLETIN OF THE SEISMOLOGICAL SOCIETY OF AMERICA
出版日期2021-12-01
卷号111期号:6页码:3103-3117
ISSN号0037-1106
DOI10.1785/0120210070
英文摘要Through downhole monitoring, the focal mechanisms of microearthquakes can be quantitatively determined, thus providing valuable information for characterizing the fracturing process and the in situ stress status. The double-couple (DC) and moment tensor (MT) source models are commonly used to study microearthquakes. However, the DC model fails to include non-DC mechanisms, and MT inversion from single-well data is still challenging. One possible way to address this is using the shear-tensile general dislocation (GD) source model. We provide a detailed comparison of the DC, GD, and MT models, and introduce the differences in their modeling and inversion theories. These three models are described by four, five, and six parameters, and correspond to a single point, a straight line, and the entire space in the Hudson source-type plots, respectively. Both the DC and GD models yield nonlinear inversions, whereas the MT inversion is linear. Synthetic tests set up from a field single-well monitoring case are performed to study the resolvability of the DC, GD, and MT models in single-well focal mechanism inversions. The results indicate that the inversion error increases from DC -> GD -> MT for a single-well acquisition system, and the GD and DC inversions are both stable, whereas the MT inversion deviates from the inputs in cases with a perfectly vertical receiver array, 5% model velocity perturbations, 10 m horizontal source location errors, or 40% noise levels. We also find that the focal mechanism inversion mainly depends on the horizontal source-receiver azimuth coverage, and that the nonvertical well direction is helpful for constraining single-well inversions. According to our study, focal mechanism inversions based on the GD model can obtain reliable solutions from near-vertical single-well data, which will help improve non-DC earthquake studies.
WOS关键词MOMENT-TENSOR INVERSION ; SHALLOW EARTHQUAKES ; HYDROFRACTURE ; RESOLUTION
资助项目National Natural Science Foundation of China[41804050] ; National Natural Science Foundation of China[41974156]
WOS研究方向Geochemistry & Geophysics
语种英语
WOS记录号WOS:000722834000010
出版者SEISMOLOGICAL SOC AMER
资助机构National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China
源URL[http://ir.iggcas.ac.cn/handle/132A11/103863]  
专题地质与地球物理研究所_中国科学院油气资源研究重点实验室
地质与地球物理研究所_中国科学院地球与行星物理重点实验室
通讯作者Chang, Xu
作者单位1.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Earth & Planetary Phys, Beijing, Peoples R China
2.Chinese Acad Sci, Innovat Acad Earth Sci, Beijing, Peoples R China
3.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Petr Resource Res, Beijing, Peoples R China
推荐引用方式
GB/T 7714		 Li, Han,Chang, Xu,Hao, Jinlai,et al. Comparison of Single-Well Microseismic Focal Mechanism Inversions with Different Source Models[J]. BULLETIN OF THE SEISMOLOGICAL SOCIETY OF AMERICA,2021,111(6):3103-3117.
APA Li, Han,Chang, Xu,Hao, Jinlai,&Wang, Yibo.(2021).Comparison of Single-Well Microseismic Focal Mechanism Inversions with Different Source Models.BULLETIN OF THE SEISMOLOGICAL SOCIETY OF AMERICA,111(6),3103-3117.
MLA Li, Han,et al."Comparison of Single-Well Microseismic Focal Mechanism Inversions with Different Source Models".BULLETIN OF THE SEISMOLOGICAL SOCIETY OF AMERICA 111.6(2021):3103-3117.

入库方式： OAI收割

来源：地质与地球物理研究所

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