GRAVITY, MAGNETIC AND ELECTRIC COMPREHENSIVE GEOPHYSICAL PROSPECTING FOR DEEP STRUCTURES IN HETAO BASIN
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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。Abstract: The gravity, magnetic, and electrical methods have been used to reveal the structure developed in the deep covered area of the Hetao Basin. We have carried out a lot of research on the characteristics of the northern and southern boundary faults, the features and thickness of Quaternary sediments and the structures developed in the basement of the Hetao Basin. A preliminary study on the distribution of Quaternary aquifer in this area was made by using electrical resistivity method. The joint inversion results of gravity and magnetic data, and earthquake data have been analyzed. And four concealed fault F1 to F4 from south to north and Langshan-Seertengshan piedmont fault F5 have been revealed. The fluctuation and buried depth of the crystalline basement in the area have been revealed. Depth of the basement in the southern part of the study area is about 2.5~4.2 km, and which in the northern part is up to 6 km. North Adjacent to the Seertengshan piedmont fault, the basement rock has been uplifted to about 0-1 km.
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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 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 
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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 10~15 2~3 中细砂 7~10 3~5 细砂、黏土 ＜7 ＞3
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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
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表 4 天然地震事件
Table 4. Earthquake events
日期 纬度 经度 深度/km 震级(Ms) 1971/5/7 41°00'00″ 108°00'00″ 20 4.0 1979/9/28 41°12'00″ 108°00'00″ 15 3.2 2001/12/17 41°09'36″ 107°51'36″ 15 3.1 2002/12/4 40°57'54″ 107°52'19″ 33 4.7 2005/2/27 40°53'60″ 107°45'00″ 11 4.5 2005/2/27 40°44'17″ 107°54'32″ 10 4.0 2005/2/27 40°52'48″ 107°49'12″ 20 3.6 2005/3/25 41°00'00″ 107°47'60″ 15 3.6 2005/3/25 40°51'00″ 107°49'12″ 5 3.3 2006/6/5 41°17'60″ 107°47'60″ 12 4.8 注:天然地震数据来自http://data.earthquake.cn/data/index.jsp
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