| 利用全波形匹配方法确定水力压裂诱发地震震源机制 |
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| 引用本文： | 谭玉阳,胡隽,张海江,苗园园,查华胜,廖雷,钱佳威.利用全波形匹配方法确定水力压裂诱发地震震源机制[J].地球物理学报,2019,62(11):4417-4436. |
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| 作者姓名： | 谭玉阳 胡隽 张海江 苗园园 查华胜 廖雷 钱佳威 |
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| 作者单位： | 1. 中国科学技术大学地球和空间科学学院, 合肥 230026;2. 成都理工大学数学地质四川省重点实验室, 成都 610059;3. 安徽万泰地球物理技术有限公司, 合肥 230026 |
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| 基金项目： | 国家科技重大专项课题（2016ZX05023004-003），国家自然科学基金项目（41804040，41604050）联合资助. |
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| 摘 要： | 准确确定水力压裂诱发地震的震源机制对于描述裂缝破裂类型以及工区地应力状态十分重要.本文采用全波形匹配的方法确定诱发地震震源机制解，在拟合波形的同时对实际数据P波初动极性和纵横波振幅比也进行匹配，并在此基础上发展了一种基于邻域算法分级优化确定震源机制解的新方法.新方法的优势在于它对解具有更强的约束，并且能够解决现有方法中存在的权值系数选择问题.合成数据测试结果表明新方法能够得到可靠的震源机制解.本文将该方法应用于国内某页岩气田水力压裂诱发地震监测数据，反演结果表明诱发地震的震源类型以走滑破裂为主，表明该地区的最大水平主应力大于垂直主应力.
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| 关 键 词： | 诱发地震 震源机制 全波形匹配 P波初动极性 纵横波振幅比 邻域算法 |
| 收稿时间： | 2018-11-13 |
Source mechanism determination for hydraulic fracturing induced seismicity using full-waveform matching |
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| TAN YuYang,HU Jun,ZHANG HaiJiang,MIAO YuanYuan,ZHA HuaSheng,LIAO Lei,QIAN JiaWei.Source mechanism determination for hydraulic fracturing induced seismicity using full-waveform matching[J].Chinese Journal of Geophysics,2019,62(11):4417-4436. |
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| Authors: | TAN YuYang HU Jun ZHANG HaiJiang MIAO YuanYuan ZHA HuaSheng LIAO Lei QIAN JiaWei |
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| Institution: | 1. School of Earth and Space Sciences, University of Science and Technology of China, Hefei 230026, China;2. Geomathematics Key Laboratory of Sichuan Province, Chengdu University of Technology, Chengdu 610059, China;3. Anhui Wantai Geophysical Technology Co. Ltd., Hefei 230026, China |
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| Abstract: | The source mechanism of induced seismicity by hydraulic fracture stimulation is crucial for characterizing the fracture type and local stress state. In this study, we adopted a full-waveform matching technique to determine the source mechanisms for induced seismicity. In addition to fit the waveforms of real data, this technique also matches the P-wave first-motion polarities and S/P amplitude ratios. Based on this technique, we developed a new source inversion method using the neighbourhood algorithm. The advantages of the new method are that it can better constrain the solutions and address the issue of existing approach in determining the optimal weights. Through synthetic data tests, we demonstrated the new method can yield reliable source mechanism solutions. We then applied this method to the monitoring data of induced seismicity in a shale gas field. The results show the induced events have mostly strike-slip mechanisms, implying that the maximum horizontal stress in the monitored area is larger than the vertical stress. |
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| Keywords: | Induced seismicity Source mechanism Full-waveform matching P-wave first motion polarity S/P amplitude ratio Neighbourhood algorithm |
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