| 龙滩水库诱发地震的孔隙压力扩散特征 |
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| 引用本文： | 刘耀炜,许丽卿,杨多兴.龙滩水库诱发地震的孔隙压力扩散特征[J].地球物理学报,2011,54(4):1028-1037. |
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| 作者姓名： | 刘耀炜 许丽卿 杨多兴 |
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| 作者单位： | 中国地震局地壳应力研究所,中国地震局地下流体动力学重点实验室,北京 100085 |
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| 基金项目： | "十一五"国家科技支撑计划 |
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| 摘 要： | 利用孔隙压力扩散机制,分析了广西省龙滩水库与蓄水有关的小震精定位数据,获得了5个分区的流体孔隙压力扩散特征.龙滩水库与蓄水有关的小震活动表现出明显分区现象,使用多源孔隙压力扩散过程触发机理,计算出5个分区流体孔隙压扩散系数值为0.04～0.65 m2/s.根据5个分区流体孔隙压力扩散程度,将这5区划分为I、Ⅱ、Ⅲ三种类...
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| 关 键 词： | 水库诱发地震 小震活动 孔隙压力扩散 龙滩水库 |
| 收稿时间： | 2010-04-08 |
Pore pressure diffusion characteristics of Longtan reservoir-induced-earthquake |
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| LIU Yao-Wei,XU Li-Qing,YANG Duo-Xing.Pore pressure diffusion characteristics of Longtan reservoir-induced-earthquake[J].Chinese Journal of Geophysics,2011,54(4):1028-1037. |
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| Authors: | LIU Yao-Wei XU Li-Qing YANG Duo-Xing |
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| Institution: | Institute of Crustal Dynamics, Laboratory of Underground Fluid Dynamics, CEA, Beijing 100085, China |
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| Abstract: | We analyzed the precisely relocated microseismic events sequences of Longtan reservoir in Guangxi province. By applying pore pressure diffusion mechanism we identified typical spatiotemporal characteristics of 5 microseismic events swarms. Microseismic events sequences of Longtan reservoir showed obvious partitions characteristics,which can be interpreted by multi-sources triggering the diffusion of pore pressure. By assuming that each swarm was triggered by its own pore pressure source, diffusivities with values between 0.04 m2/s and 0.65 m2/s were estimated. Based on the pore pressure diffusion characteristics of different microseismic swarms,the 5 swarms can be divided into 3 types,with diffusivities of 0.45~0.65 m2/s,0.25 m2/s, and 0.04~0.08 m2/s, respectively. The 3 types of blocks have obvious structure differences,which are closely related to diffusivity values. Areas with fault structure have larger earthquake distribution,and predominant directions of the earthquake distribution are consistent or intersect with fault lines,while in the area without fault structure,the earthquake distribution is concentrated,without a dominant distribution direction. However,the relationship of lithology of different types and diffusivities is not obvious. At the same time,pore pressure diffusive duration time and the maximum diffusive distance of different types are well correlated with the pore pressure diffusivity. The biggest triggered earthquake of ML4.2 occurred in the block of typeⅠwhich has the biggest diffusivity. This research may be helpful to the study of the mechanism of reservoir induced earthquake,and to assess the risk of reservoir induced earthquake. |
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| Keywords: | Reservoir-induced earthquake Microseismic events sequences Pore pressure diffusion Longtan reservoir |
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