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《Chinese Journal of Geophysics》 2011-04
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Pore pressure diffusion characteristics of Longtan reservoir-induced-earthquake

LIU Yao-Wei,XU Li-Qing,YANG Duo-Xing Institute of Crustal Dynamics,Laboratory of Underground Fluid Dynamics,CEA,Beijing 100085,China  
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 multisources 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 m~2/s and 0.65 m~2/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 0.45~0.65m~2/s,0.25m~2/s,and 0.04~0.08m~2/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 M_L4.2 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.
【Fund】: “十一五”国家科技支撑计划(2006BAC01B02-03-01)资助
【CateGory Index】: P315
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