Pore Pressure Diffusion Characteristics of Longtan Reservoir-Induced-Earthquake

详细信息   

• 责任者：Liu Yaowei (Institute of Crustal Dynamics ; Laboratory of Underground Fluid Dynamics ; CEA ; Beijing 100085 ; China) ; Xu Liqing
• 刊名：Chinese Journal of Geophysics
• 出版年：2011
• 卷期：54(4)
• 关键词：水库地震 ; reservoir earthquake ; 诱发地震 ; induced earthquakes ; 广西 ; Guangxi
• 页码：p.1028-1037
• 图表：8 illus., 1 table, 12 refs.
• 分类号：0500
• 出版序号：764
• issnNo：ISSN0001-5733
• isbnNo：CN11-2074/P

摘要

By applying pore pressure diffusion mechanism， the authors 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.