综合物探方法在广西罗城县活动断裂鉴定中的应用

doi:10.11720/wtyht.2021.2576

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摘要

城市活动断层探测在城市发展建设过程中和保障人民生命财产安全方面起到重要作用。本文以鉴定罗城断裂和上天桥—寺门断裂活动性为目的,在地震地质调查确定其断裂的几何学、运动学和年代学的基础上,选择第四系覆盖断裂最有可能活动的地段,重点采用高密度电法和地震映像方法来探测断裂在隐伏地段的具体位置,通过排钻验证,以及揭露其断裂与第四纪覆盖层之间的错断关系,来确定其断裂最新活动年代。结果表明,高密度电法和地震映像综合物探方法准确探测到了罗城断裂和上天桥—寺门断裂在隐伏地段的位置,且钻孔岩心中断裂面、断裂擦痕、断裂碎裂岩和构造角砾岩等发育,但断裂未错断第四系覆盖层,从而确定其断裂活动年代为早更新世。根据相关规范要求,罗城断裂和上天桥—寺门断裂全新世以来不活动,罗城县的建设规划可不采取避让措施,该鉴定结果为今后罗城县的工程建设提供了安全保障。

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	吴教兵
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	韦王秋

关键词 ：活动断裂, 地震地质调查, 高密度电法, 地震映像, 排钻

Abstract：

Urban active fault detection plays an important role in the process of urban development and construction and also in ensuring the safety of people's lives and property.In this paper,with the purpose of identifying the activity of Luocheng fault and Shangtianqiao-Simen fault and on the basis of geometry,kinematics and chronology of the fault determined by the seismic geological survey,the authors detected the specific location of the fault that lies at the most likely active segment and is covered by the Quaternary sediments by high-density electrical method and seismic imaging method,which was then verified by drilling arrangement.In addition,the latest active age of the fault was determined through the offset relationship between the fault and the Quaternary overburden.The results show that the location of Luocheng fault and Shangtianqiao-Simen fault in the concealed segment can be accurately detected by the high-density electrical methods and seismic mapping method,and the fault activity age is determined to be the early Pleistocene based on the fact that fracture surface,scratch,cataclasite and structural brecciaa are developed,but the fault does not cut the Quaternary overburden.According to the requirements of relevant specifications,Luocheng fault and Shangtianqiao-Simen fault have not been active since the late Pleistocene,so the construction planning of Luocheng county does not need to take avoidance measures,and the appraisal results provide safety guarantee for the project construction of Luocheng County in the future.

Key words： active fault seismic geological survey high density electrical method seismic imaging drilling arrangement

收稿日期: 2019-12-13 修回日期: 2020-11-22 出版日期: 2021-04-20

ZTFLH:

P631.4

基金资助:广西科学研究与技术开发计划项目(桂科AB17195022);广西科学研究与技术开发计划项目(桂科AB18126040)

通讯作者: 黎峻良

作者简介: 吴教兵(1984-),男,工程师,主要从事活动断层探测、地震监测与研究工作。Email: wujiaobing@163.com

引用本文:

吴教兵, 黎峻良, 江兰, 陆俊宏, 潘黎黎, 韦王秋. 综合物探方法在广西罗城县活动断裂鉴定中的应用[J]. 物探与化探, 2021, 45(2): 346-354.
WU Jiao-Bing, LI Jun-Liang, JIANG Lan, LU Jun-Hong, PAN Li-Li, WEI Wang-Qiu. The application of comprehensive geophysical method to the identification of active faults in Luocheng County,Guangxi. Geophysical and Geochemical Exploration, 2021, 45(2): 346-354.

链接本文:

https://www.wutanyuhuatan.com/CN/10.11720/wtyht.2021.2576 或 https://www.wutanyuhuatan.com/CN/Y2021/V45/I2/346

Fig.1 罗城县地震构造分布
1—第四系;2—三叠系;3—二叠系;4—石炭系;5—泥盆系;6—震旦系;7—板溪群;8—岩浆岩;9—地震;10—断裂带;11—隐伏断裂带;12—物探测线;13—地质调查点;14—排钻

Fig.2 罗城断裂野外露头(a)、构造剖面图(b)和发育NW向水平擦痕和阶步(c)
1—构造破碎带;2—灰岩;3—断裂带

Fig.3 上天桥—寺门断裂南段野外露头(a)、构造剖面图(b)和构造角砾岩(c)
1—残积黏土;2—灰岩;3—角砾岩;4—断裂带

Fig.4 上天桥——寺门断裂北段野外露头(a)、构造剖面图(b)和断裂面(c)
1—残积黏土;2—灰岩;3—角砾岩;4—破碎带;5—断裂带

Fig.5 干扰波调查

Fig.6 A-A'测线物探成果
a—极距AO=22.5m的联合剖面曲线;b—极距AO=52.5m的联合剖面曲线;c—视电阻率等值线;d—地震映像波形

Fig.7 B-B'测线物探成果
a—极距AO=22.5m的联合剖面曲线;b—极距AO=52.5m的联合剖面曲线;c—视电阻率等值线;d—地震映像波形

Fig.8 C-C'测线物探成果
a—极距AO=35m的联合剖面曲线;b—极距AO=85m的联合剖面曲线;c—视电阻率等值线;d—地震映像波形

Fig.9 D-D'测线物探成果
a—极距AO=22.5m的联合剖面曲线;b—极距AO=52.5m的联合剖面曲线;c—视电阻率等值线;d—地震映像波形

Fig.10 E-E'测线物探成果
a—极距AO=35m的联合剖面曲线;b—极距AO=85m的联合剖面曲线;c—视电阻率等值线;d—地震映像波形

Fig.11 各测线钻探剖面
a—A-A'测线;b—C-C'测线;c—D-D'测线;d—E-E'测线;1—耕植土;2—黏土;3—粉质黏土;4—粉土;5—含砾黏土;6—白云岩;7—灰岩;8—水充填的溶洞;9—黏土充填的溶洞;10—构造碎裂岩;11—构造角砾岩;12—断裂;13—钻孔

Fig.12 各测线的钻探岩心
a—A-A'测线钻探揭露断裂面和构造碎裂岩;b—C-C'测线钻探揭露断裂擦痕面和构造角砾岩;c—D-D'测线钻探揭露断裂面和断层泥;d—E-E'测线钻探揭露断裂面和构造裂隙

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