摘要
现有的地震地电阻率观测系统需要较大的环境保护区(2—5km2).随着各地的经济发展,地电观测的环境受到越来越大的影响,造成部分台站连续多年的地电前兆观测受到严重的干扰.为了减小观测环境保护区范围,有效地抑制来自地面的观测环境改变及城市地铁、轻轨运行时漏电产生的干扰,提出了将三侧向石油电测井技术移植到地震地电阻率前兆监测领域,以提高地电前兆观测的抗干扰能力和前兆信息的监测能力.电测井有限元数值模型的计算结果表明,该方法可有效测量出地层的电阻率变化,对来自地表的干扰有较强抑制能力.分析还表明,该方法可有效抑制来自轻轨、地铁的漏电干扰.
Current earthquake ground resistivity observation system demands large environmental protection area （2-5 km^2）. Along with regional economic development, ground resistivity observation environment has suffered more and more disturbance, reSulting in severe interference in the ground resistivity precursor observation at some stations for many years. In order to reduce the range of environmental protection area and effectively suppress the interference due to environment change and electric leakage from city subway and light railway running, this paper proposes to transplant the 3 lateral component electric well logging technique in petroleum exploration to earthquake ground resistivity precursor observation, thus to enhance the anti-interference ability of ground resistivity observation. We simulated the electric well logging with a finite element model. The model calculation result shows that the method can efficiently simulate ground resistivity variation in different strata, and can suppress the strong interference coming from ground surface. The result also shows that this method can effectively avoid suffering from electric leakage interference of city subway and light railway.
出处
《地震学报》
CSCD
北大核心
2009年第3期272-281,356,共10页
Acta Seismologica Sinica
基金
国家“十一五”科技支撑计划项目(2006BAC01B02-04-03)
天津市科技支撑计划重点项目(07ZCGYSF03100)资助
关键词
地震地电阻率观测
环境干扰
电测井技术
移植改造
有限元分析
earthresistivity observation
environmental interference
electric well logging technique
transplant
finite element analysis
