摘要
为了研究银川盆地北部控制边界的西部贺兰山东麓断裂和东部黄河断裂,以及盆地内部隐伏的芦花台断裂和银川断裂的深部延伸特性,结合以往的研究手段和尺度,采用大地电磁方法对盆地北部电性结构进行精细探测。通过长周期大地电磁剖面测量,运用近参考处理技术和阻抗张量分解技术,获取了银川盆地北部中深部电性结构信息。随后,利用二维非线性共轭梯度方法对采集数据进行反演,其结果显示银川盆地北部电性分区特征明显,主要断裂反映清晰,且发现深部存在一高导通道,其极有可能为深部幔源物质的上涌通道。此次研究表明,大地电磁测深方法在银川盆地北部是一种重要的探测隐伏断层、地震区孕震环境以及与地热成因有关的地质结构的地球物理测深方法。
In order to study the deep extension characteristics of the western Helan Mountain eastern foothills fault and the eastern Yellow River fault that control the northern boundary of the Yinchuan Basin,as well as the hidden Luhuatai fault and Yinchuan fault within the basin,Considering previous research methods and scales,the magnetotellurics method was employed to conduct a detailed exploration of the electrical structure in the northern part of the basin.The article obtained the electrical structure information of the middle and deep parts of the northern Yinchuan Basin through long-period magnetotelluric profile measurements for using near-reference processing techniques and impedance tensor decomposition techniques;The 2D NLCG inversion results show obvious electrical zoning characteristics in the northern part of the Yinchuan Basin.The main fault reflects clearly,and a high conductivity channel has been found in the deep part,which is highly likely to be the upwelling of mantle derived material from the deep part.This study indicates that the magnetotelluric sounding method is an important geophysical sounding method for detecting hidden faults,seismic environments in earthquake prone areas,and geological structures related to geothermal genesis in northern part of the Yinchuan Basin.
作者
赵福元
周磊
仵阳
虎新军
卜进兵
郭少鹏
ZHAO Fuyuan;ZHOU Lei;WU Yang;HU Xinjun;BU Jinbing;GUO Shaopeng(Ningxia Institute of Geophysics and Geochemistry Investigation,Yinchuan,Ningxia 750004,China;Key Laboratory of Exploration Technologies for Oil and Gas Resources,Ministry of Education,Yangtze University,Wuhan,Hubei 430100,China)
出处
《河北工程大学学报(自然科学版)》
2025年第4期83-90,共8页
Journal of Hebei University of Engineering(Natural Science Edition)
基金
宁夏自然科学基金资助项目(2022AAC03653)
自治区地质局2022年度财政项目(NXCZ20220206)。
关键词
银川盆地
大地电磁
电性结构
高导通道
Yinchuan Basin
Magnetotelluric
electrical structure
high conductivity channel
