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重磁电综合地球物理探测河套盆地深部结构

刘嵘 马见青 李庆春 叶培盛

刘嵘, 马见青, 李庆春, 等, 2016. 重磁电综合地球物理探测河套盆地深部结构. 地质力学学报, 22 (4): 943-954.
引用本文: 刘嵘, 马见青, 李庆春, 等, 2016. 重磁电综合地球物理探测河套盆地深部结构. 地质力学学报, 22 (4): 943-954.
LIU Rong, MA Jian-qing, LI Qing-chun, et al., 2016. GRAVITY, MAGNETIC AND ELECTRIC COMPREHENSIVE GEOPHYSICAL PROSPECTING FOR DEEP STRUCTURES IN HETAO BASIN. Journal of Geomechanics, 22 (4): 943-954.
Citation: LIU Rong, MA Jian-qing, LI Qing-chun, et al., 2016. GRAVITY, MAGNETIC AND ELECTRIC COMPREHENSIVE GEOPHYSICAL PROSPECTING FOR DEEP STRUCTURES IN HETAO BASIN. Journal of Geomechanics, 22 (4): 943-954.

重磁电综合地球物理探测河套盆地深部结构

基金项目: 

中国地质调查局地质调查项目“特殊地质地貌区填图试点” DD20160060

国家自然科学基金项目 41374145

中国地质调查局特殊景观区填图试点项目 12120114042101

长安大学中央高校基本科研业务费专项资金项目 2013G1261060

详细信息
    作者简介:

    刘嵘(1992-), 男, 硕士研究生, 地球探测与信息技术专业。E-mail:liurong0918@126.com

    通讯作者:

    马见青(1984-), 男, 博士, 讲师。主要从事地震信号多尺度处理, 地调、地质填图综合地球物理处理与解释的教学与研究。E-mail:majianqing1984@126.com

  • 中图分类号: P631

GRAVITY, MAGNETIC AND ELECTRIC COMPREHENSIVE GEOPHYSICAL PROSPECTING FOR DEEP STRUCTURES IN HETAO BASIN

  • 摘要: 从地球物理的角度出发,利用重力、磁法及电法勘探对河套盆地第四系深覆盖区展开深入研究,对河套断陷带南北边界断裂——鄂尔多斯北界断裂、色尔腾山前断裂的性质,河套盆地第四纪沉积物特征及厚度,河套沉积基底构造的探测进行了大量研究工作,并利用电法剖面对该区第四纪含水层分布规律进行了初步研究。通过重磁联合反演、天然地震数据,分析并推断了研究区由南向北的4条隐伏断层F1-F4及狼山-色尔腾山前大断裂F5,同时揭露了该区结晶基底的起伏及埋深,研究区南部基底深度2.5~4.2 km,北部中心基底最大埋深可达6 km,北部色尔腾山前断裂带迅速升至0~1 km。

     

  • 图  1  河套盆地及邻区构造纲要图

    Figure  1.  Structure outline of Hetao Basin and adjacent area

    图  2  河套盆地研究区概况图

    Figure  2.  DEM of the Hetao Basin and location of the study area

    图  3  100-110-120测线实测布格重力异常(Δg)与区域重力对比剖面

    Figure  3.  The measured Bouguer gravity anomaly (Δg) compared with regional gravity anomaly in line 100-110-120

    图  4  130测线实测布格重力异常(Δg)剖面图

    Figure  4.  Measured Bouguer gravity anomaly profile of profite 130

    图  5  100-110-120测线实测磁异常(ΔT)与航磁异常对比剖面图

    Figure  5.  Measured magnetic anomalies (ΔT) and aeromagnetic anomaly profile of profile 100-110-120

    图  6  排列45-44超高密度反演断面

    Figure  6.  Ultra high density inversion section in arrangement of 45-44

    图  7  100断面33-36排列超高密度反演断面

    Figure  7.  Super high density inversion in section 33-36 of the 100 cross section

    图  8  110断面37-100排列超高密度反演断面

    Figure  8.  Super high density inversion section in arrangement 37-100 of 110 section

    图  9  110线110号点AMT电阻率反演图

    Figure  9.  AMT resistivity inversion model from point 110 in line 110

    图  10  重磁反演拟合曲线

    Figure  10.  Fitting curves of gravity and magnetic inversion

    图  11  河套覆盖区深部模型

    1—鄂尔多斯台坳斜坡; ②—基底隆升; ③—乌加河凹陷; F1—F4—河套新断层; F5—狼山南缘断层(色尔腾山前断裂)

    Figure  11.  The deep model of the covered area in Hetao Basin

    表  1  河套盆地第四系不同堆积物电阻率统计

    Table  1.   Resistivity statistics of different Quaternary deposits in the Hetao Basin

    岩性电阻率/(Ω·m)
    粗砂、砂砾石>50
    中砂30~40
    细砂20~30
    黏土<20
    下载: 导出CSV

    表  2  河套盆地潜水面以下第四系不同堆积物电阻率及地下水矿化度特征

    Table  2.   Characteristics of resistivity of Quaternary deposits below water table and groundwater salinity in the Hetao Basin

    地层岩性电阻率/(Ω·m)地下水矿化度/(g·L-1)
    粗砂、砂砾石>15<3
    中粗砂10~152~3
    中细砂7~103~5
    细砂、黏土<7>3
    下载: 导出CSV

    表  3  鄂尔多斯—阴山一带岩石磁化率参数[15]

    Table  3.   Rock magnetic susceptibility parameters in the Erdos-Yinshan area

    时代阴山造山带鄂尔多斯盆地
    岩性磁化率/(10-5SI)岩性磁化率/(10-5SI)
    太古代片麻岩、混合烟及变粒岩30~10000片麻岩及变粒岩、基性火山岩1800~5000
    下元古代大理岩、板岩及石英砂岩10~50花岗岩、混合岩、大理岩20
    中上元古代板岩10~40浅变质岩1~9
    石英粉砂岩20~3000
    古生代凝灰岩10~30碳酸盐岩、陆相碎屑岩<20
    砂岩40~100
    中生代砾岩、泥岩、砂岩200~500粗碎屑岩1~9
    基性火山岩1500~3000泥岩、粉砂岩10~30
    新生代黏土岩50风积沙土50
    含砾细沙、泥岩200~800
    下载: 导出CSV

    表  4  天然地震事件

    Table  4.   Earthquake events

    日期纬度经度深度/km震级(Ms)
    1971/5/741°00'00″108°00'00″204.0
    1979/9/2841°12'00″108°00'00″153.2
    2001/12/1741°09'36″107°51'36″153.1
    2002/12/440°57'54″107°52'19″334.7
    2005/2/2740°53'60″107°45'00″114.5
    2005/2/2740°44'17″107°54'32″104.0
    2005/2/2740°52'48″107°49'12″203.6
    2005/3/2541°00'00″107°47'60″153.6
    2005/3/2540°51'00″107°49'12″53.3
    2006/6/541°17'60″107°47'60″124.8
    注:天然地震数据来自http://data.earthquake.cn/data/index.jsp
    下载: 导出CSV
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  • 收稿日期:  2016-09-16
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