银川盆地东缘上地壳电性结构特征及地热勘探方向

doi:10.11720/wtyht.2024.1489

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摘要

随着银川盆地东缘地热井的成功实施,指明了围绕黄河断裂及其次级断裂寻找地热的新方向。为了进一步研究黄河断裂对银川盆地东缘地热资源的控制作用及缩小勘探靶区,共布设了 4 条 MT 测线,获得了71个测深点。通过对大地电磁测深资料进行预处理及二维反演,获得了研究区10 km以浅的二维电性结构。综合研究区以往地质、重力、微动、可控源音频大地电磁测深资料,对银川盆地东缘地层、断裂构造进一步解释,认为大地电磁测深测线所反映的奥陶系基底高阻内出现的相对低阻可能是黄河断裂后缘次级断裂发育部位,由奥陶系破碎充水所致,具有地热资源勘探的潜力。

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	仵阳
	赵福元
	虎新军
	陈晓晶
	卜进兵
	郭少鹏

关键词 ：银川盆地东缘, 电性结构, 地热勘探

Abstract：

The successful operation of geothermal wells on the eastern margin of the Yinchuan Basin suggests a new geothermal exploration orientation around the Huanghe fault and its secondary faults. To further investigate the controlling effect of the Huanghe fault on geothermal resources in the study area and pinpoint the exploration target, this study arranged four magnetotelluric (MT) lines, obtaining 71 survey points.The preprocessing and two-dimensional inversion of MT data yielded a two-dimensional electrical structure of the study area within a depth of 10 km.Based on the previous geological, gravity, microtremor, and controllable source audio magnetotellurics(CSAMT) data in the study area, this study further interpreted the strata and fault structures of the study area.It posited that the relatively-low-resistivity zone within the high-resistivity zone of the Ordovician basement reflected by the MT lines may be the secondary-fault development site at the rear edge of the Huanghe fault, which is caused by the fragmentation and water filling of Ordovician strata, showing certain exploration potential for geothermal resources.

Key words： eastern margin of the Yinchuan Basin electrical structure geothermal exploration

收稿日期: 2023-11-10 修回日期: 2023-12-12 出版日期: 2024-10-20

ZTFLH:

P631

基金资助:宁夏自然科学基金项目(2022AAC03651);宁夏自然科学基金项目(2023AAC05066);2022年度宁夏回族自治区财政项目(NXCZ20220206);宁夏深部探测方法研究示范创新团队项目(KJT2019005)

通讯作者: 赵福元(1986-),男,高级工程师,主要从事地球物理勘查技术应用与研究工作。Email:zhao_fuyuan@163.com

作者简介: 仵阳(1985-),男,高级工程师,主要从事地球物理勘查技术应用与研究工作。Email:wuyang.2224@163.com

引用本文:

仵阳, 赵福元, 虎新军, 陈晓晶, 卜进兵, 郭少鹏. 银川盆地东缘上地壳电性结构特征及地热勘探方向[J]. 物探与化探, 2024, 48(5): 1258-1267.
WU Yang, ZHAO Fu-Yuan, HU Xin-Jun, CHEN Xiao-Jing, BU Jin-Bing, GUO Shao-Peng. Electrical structure characteristics and geothermal exploration directions of the upper crust on the eastern margin of the Yinchuan Basin. Geophysical and Geochemical Exploration, 2024, 48(5): 1258-1267.

链接本文:

https://www.wutanyuhuatan.com/CN/10.11720/wtyht.2024.1489 或 https://www.wutanyuhuatan.com/CN/Y2024/V48/I5/1258

Fig.1 研究区区域位置及大地电磁测线位置
1—正断层;2—逆断层;3—平移断层;4—地名;5—MT测线;6—黄河;AB—阿拉善地块;YCB—银川盆地;OB—鄂尔多斯地块;TP—青藏高原;蓝色框代表研究区

Fig.2 研究区地质图及大地电磁测点位置
1—第四系;2—新近系;3—地质推断断裂;4—MT测点;5—典型MT测点;6—地名;7—地热孔;YCB—银川盆地;OB—鄂尔多斯地块

Fig.3 典型测点视电阻率和相位曲线
红色曲线—XY模式;蓝色曲线—YX模式

Fig.4 L1线构造维性分布云图
a—一维偏离度(S_1D);b—二维偏离度(S_2D);c—二维有效因子(e_2D)

Fig.5 L1测线电性主轴统计成像结果
a—统计玫瑰图;b—频率分布云图;c—测点分布云图

Fig.6 TM模式视电阻率与相位的原始数据(a、c)响应数据(b、d)拟断面

Fig.7 MT二维反演电性结构模型

Fig.8 研究区地层综合解释成果
a—L1线;b—L2线;c—L3线;d—L4线

Fig.9 DRT-03孔测井综合解释成果

Fig.10 研究区断裂综合解释成果
a—研究区重力异常;b—L1线;c—L2线;d—L3线;e—L4线

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