微动探测:地层分层和隐伏断裂构造探测的新方法  

Microtremor survey method: A new geophysical method for dividing strata and detecting the buried fault structures

作　　者：徐佩芬[1] 李世豪[1,2] 杜建国[3] 凌苏群 郭慧丽[1,2] 田宝卿[1,2] 

机构地区：[1]中国科学院地质与地球物理研究所地球深部研究重点实验室,北京100029 [2]中国科学院大学,北京100049 [3]江苏省地质调查研究院地热中心,南京210049 [4]日本地学数据分析研究所

出　　处：《岩石学报》2013年第5期1841-1845,共5页Acta Petrologica Sinica

基　　金：中国科学院知识创新工程重要方向项目(KZCX2-EW-107)资助

摘　　要：微动探测作为地层分层和隐伏断裂构造探测的物探新方法,已成为盆地结构调查、地热井位选址和隐伏地质构造探测的重要物探手段。微动测深确定岩性差异较大的地质界面,如新生界地层底界、侏罗系与二叠系地层分界面、二叠系-石炭系灰岩顶界面等,深度误差可控制在5%左右。断层破碎带/隐伏断裂构造在微动视S波速度剖面上显示为低速异常或明显的速度差异,易于识别、解释。二维微动剖面技术已在探测隐伏地质构造(断层、陷落柱等)方面取得较好地质效果。本文介绍其原理、方法和应用实例。Microtremor survey as a new geophysical method has become an important technology for dividing strata, detection of basin structure, site selection of geothermal wells and survey of the buried fault structures and geological structures in mining area. The microtremor sounding method is used to detect geological interface with the distinct lithological differences in the error of the depth of about 5% , such as the lower boundary of the Cenozoic strata, the interface between Jurassic and Permian formations and the top interface of Permian to Carboniferous limestone, and so on. Fault fracture zone and buried fault structures are easy to be identified and interpreted with low velocity anomalies or obvious velocity differences in the apparent velocity profile of S-wave from microtremor survey. 2D mierotremor profiling technique has made better geological effects in the detection of buried geological structures （faults, collapse breccia pipes, etc. ）. This article describes the principles, methods and its applications.

关 键 词：微动探测 S波速度结构 地层分层 隐伏断裂 

分 类 号：P313[天文地球—固体地球物理学]