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物探与化探  2022, Vol. 46 Issue (4): 862-867    DOI: 10.11720/wtyht.2022.1314
  地质调查·资源勘查 本期目录 | 过刊浏览 | 高级检索 |
银川盆地南部灵武凹陷基底构造特征
陈晓晶(), 虎新军(), 白亚东, 仵阳, 陈涛涛, 曹园园, 倪萍
宁夏回族自治区地球物理地球化学勘查院, 宁夏 银川 750001
Basement structure characteristics of the Lingwu depression in southern Yinchuan Basin
CHEN Xiao-Jing(), HU Xin-Jun(), BAI Ya-Dong, WU-Yang , CHEN Tao-Tao, CAO Yuan-Yuan, NI-Ping
Geophysical and Geochemical Exploration Institute of the Ningxia Hui Autonomous Region,Yinchuan 750001,China
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摘要 

灵武凹陷位于银川断陷盆地东南部,受喜马拉雅期两次构造应力作用,即鄂尔多斯地块EW向的拉张应力及青藏高原NE向的挤压应力,造就了该区现今复杂的地质构造格局,为构造转折、交汇部位。自1970年以来监测到银川盆地及其周缘大于2.0级以上地震约3 000余次,且大多数小震及中强地震集中于灵武凹陷范围内,存在较严重的地震灾害隐患。以往研究表明,断裂构造为地震发生的根本原因,地层是决定地震活动次生灾害的主要因素。为解译灵武凹陷基底地质构造,笔者以1∶5万区域重力资料为基础,以钻孔、地震剖面、大地电磁测深、可控源音频大地电磁测深剖面资料为约束,利用2.5D人机交互反演技术对灵武凹陷基底特征进行了精细刻画,为地震灾害防治工作提供依据。

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陈晓晶
虎新军
白亚东
仵阳
陈涛涛
曹园园
倪萍
关键词 灵武凹陷1∶5万重力2.5D人机交互反演基底构造    
Abstract

The Lingwu depression,located in the southeastern part of the Yinchuan Faulted Basin,has a complex geological tectonic framework and serves as the turning and intersection part of structures due to the two Himalayan tectonic stresses,namely the EW-direction tensile stress of the Ordos block and the NE-direction compressive stress of the Qinghai-Tibet Plateau. Since 1970, more than 3000 earthquakes with magnitudes of greater than 2.0 have been monitored in the Yinchuan Basin and its periphery. Among them, most of the small and moderately strong earthquakes occurred in the Lingwu depression, which, therefore, has serious hidden risks of earthquake disasters. Previous studies indicate that fault structures are the cause for the earthquakes and that strata serve as the main reason for the earthquake secondary disasters in this depression. To interpret the geological structures in the basement of the Lingwu depression, this study finely characterized the basement characteristics of the Lingwu depression using the 2.5D human-computer interactive inversion technology based on the 1∶50,000 regional gravity data and the constraints of data on drill holes, seismic profiles, magnetotelluric sounding, and controlled source audio-frequency magnetotellurics (CSAMT) profiles, thus providing a basis for the prevention and control of earthquake disasters.

Key wordsLingwu depression    1∶50,000 gravity    2.5D human-computer interactive inversion    basement structure
收稿日期: 2021-06-11      出版日期: 2022-08-17
ZTFLH:  P631  
基金资助:宁夏回族自治区重点研发计划重大(重点)项目(2018BFG02012);宁夏深部探测方法研究示范创新团队项目(KJT2019005);宁夏自然科学基金项目(2020AAC03449);宁夏自然科学基金项目(2021AAC03451);2020年宁夏回族自治区青年拔尖人才培养工程项目
通讯作者: 虎新军
作者简介: 陈晓晶(1990-),女,2014年毕业于西北大学,硕士学位,主要从事地球物理勘探研究工作。Email: 825785150@qq.com
引用本文:   
陈晓晶, 虎新军, 白亚东, 仵阳, 陈涛涛, 曹园园, 倪萍. 银川盆地南部灵武凹陷基底构造特征[J]. 物探与化探, 2022, 46(4): 862-867.
CHEN Xiao-Jing, HU Xin-Jun, BAI Ya-Dong, WU-Yang , CHEN Tao-Tao, CAO Yuan-Yuan, NI-Ping . Basement structure characteristics of the Lingwu depression in southern Yinchuan Basin. Geophysical and Geochemical Exploration, 2022, 46(4): 862-867.
链接本文:  
https://www.wutanyuhuatan.com/CN/10.11720/wtyht.2022.1314      或      https://www.wutanyuhuatan.com/CN/Y2022/V46/I4/862
Fig.1  研究区地质构造
地层代号 密度层代号 平均密度值/
(g·cm-3)
密度界面
代号 密度差/(g·cm-3)
Q ρ1 1.8 Δρ1.2 0.65
E-N ρ2 2.45
Δρ2.3 0.24
O ρ3 2.69
Δρ3.4 0.09
Pt ρ4 2.78
Table 1  研究区密度层划分
层序 电阻率/(Ω·m) 厚度/km 底面深/km
1 5~50 2~5 2.4~5
2 600~1000 16~19 19~22
3 1~20 20~25 30~32
4 1000~5000 60 85~89
5 0.2~12
Table 2  银川地堑壳幔电性结构分层
Fig.2  灵武凹陷剩余重力异常及二维反演剖面位置
Fig.3  灵武凹陷基底顶面深度
Fig.4  北部L1剖面2.5D反演过程
a—CSAMT反演电阻率剖面;b—2.5D反演结果
Fig.5  中部L2剖面2.5D反演过程
a—CSAMT反演电阻率剖面;b—2.5D反演结果
Fig.6  南部L3剖面2.5D反演过程
a—CSAMT反演电阻率剖面;b—2.5D反演结果
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