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引用本文:戚帮申,丰成君,谭成轩,张鹏,孟静,张春山,杨为民,杨肖肖,雷晓东. 京张地区延矾盆地北缘活动断裂带桑园镇隐伏段综合地球物理及钻孔地层剖面研究[J]. 中国地质, 2019, 46(3): 468-481.
QI Bangshen,FENG Chengjun,TAN Chengxuan,ZHANG Peng,MENG Jing,ZHANG Chunshan,YANG Weimin,YANG Xiaoxiao,LEI Xiaodong. Application of comprehensive geophysical-drilling exploration to detect the buried North Boundary active Fault Belt of Yanqing-Fanshan Basin in Sangyuan town, Beijing-Zhangjiakou area[J]. Geology in China, 2019, 46(3): 468-481(in Chinese with English abstract).
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京张地区延矾盆地北缘活动断裂带桑园镇隐伏段综合地球物理及钻孔地层剖面研究
戚帮申1,2,3, 丰成君2,3, 谭成轩2,3, 张鹏2,3, 孟静2,3, 张春山2,3, 杨为民2,3, 杨肖肖4, 雷晓东1
1.北京市地质勘察技术院, 北京 100120;2.中国地质科学院地质力学研究所, 北京 100081;3.自然资源部新构造运动与地质灾害重点实验室, 北京 100081;4.中国科学院地质与地球物理研究所, 北京 100029
摘要:
京张高铁预选路线跨越延矾盆地北缘活动断裂隐伏段,隐伏活动断裂的产状、活动性对高铁设计、建设和运营具有直接影响。针对盆地隐伏活动断裂的复杂性特征,利用可控源音频大地电磁测深(CSAMT)、浅层地震、高密度电阻率综合地球物理探测,以及钻孔地层剖面记录等方法,分析延矾盆地北缘活动断裂隐伏段特征,结果表明:(1)延矾盆地北缘活动断裂隐伏段由两条次级断层组成(F2-1、F2-2),二者大致平行分布,走向N56°E,倾角为50~70°,平面上,与地表出露段共同呈右阶雁列分布;(2)F2-1次级断层可分辨上断点埋深约10 m,其晚更新世以来垂直滑动速率大约0.12 mm/a,应是重大工程建设重点设防对象,次级断裂F2-2可分辨上断点埋深约30 m,晚更新世以来活动性弱;(3)通过钻孔地层剖面记录与地球物理探测成果对比,CSAMT法与浅层地震勘探对基岩顶界面探测可靠有效,高密度电阻率法对于该地区浅部第四系松散堆积物探测效果显著,比较直观地反映出电性异常体的形态和规模,通过综合地球物理探测,能够做到优势互补,减少隐伏活动断层解译的不确定性。
关键词:  京张地区  延矾盆地北缘断裂  隐伏活动断裂  综合地球物理探测  钻孔联合剖面
DOI:10.12029/gc20190303
分类号:P541
基金项目:中国地质调查局地质调查项目“京津冀协同发展区活动构造与区域地壳稳定性调查”(DD20160267)、国家自然科学基金“断动导致地应力解耦的机理研究”(41702341)和北京市地质矿产勘查开发局地质调查项目“延庆盆地1:2.5万高精度重磁测量”(PXM2019-158307-000009)联合资助。
Application of comprehensive geophysical-drilling exploration to detect the buried North Boundary active Fault Belt of Yanqing-Fanshan Basin in Sangyuan town, Beijing-Zhangjiakou area
QI Bangshen1,2,3, FENG Chengjun2,3, TAN Chengxuan2,3, ZHANG Peng2,3, MENG Jing2,3, ZHANG Chunshan2,3, YANG Weimin2,3, YANG Xiaoxiao4, LEI Xiaodong1
1.Beijing Institute of Geo-exploration Technology, Beijing 102218, China;2.Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081, China;3.Key Laboratory of Neotectonic Movement & Geohazard, Ministry of Natural Resources, Beijing 100081, China;4.Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China
Abstract:
North Yanqing and Fanshan Basin active fault is a significant factor for engineering design of Beijing-Zhangjiakou highspeed railway, and buried section of this active fault in Yanqing and Fanshan Basin is complicated and unclear. In order to detect the location, characteristics and activity intensity of the buried active fault, the authors used many methods, such as the controlled source audio-frequency magnetotelluric (CSAMT), shallow seismic reflection, high density resistivity and drilling exploration. The results show that the buried North Yanqing and Fanshan Basin active fault consists of two secondary faults, i.e., F2-1, F2-2, which are distributed parallelly. The trending of the tow secondary faults is N56°E, and the dip angle of them is 50~70°. Meanwhile, they are right-stepped, oblique-arranged normal faults. The burial depth of distinguishable broken point is 10m for F2-1 secondary fault and 30m for F2-2 secondary fault. F2-1 secondary fault is an active fault, its vertical activity rate has been 0.12mm/a since the Late Pleistocene. Activity of F2-2 secondary fault has been weak since the Late Pleistocene. Compared with the result of drilling exploration, the CSAMT method and shallow seismic reflection method have some advantages in exploration of bedrock interface, whereas the high density resistivity method is good at exploration of shallow loose deposits and can display more effectively broken point of fault. By means of comprehensive geophysical-drilling exploration, researchers can achieve the complementary advantages, and can reduce the uncertainty of the interpretation for buried active faults exploration.
Key words:  Beijing-Zhangjiakou area  North Yan-fan Basin fault  buried active fault  geophysical exploration  drilling exploration