雄安新区深部雾迷山组热储层时频电磁法探测研究

doi:10.11720/wtyht.2023.1611

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雄安新区是我国中东部地区地热资源开发利用条件最好的地区之一,蓟县系雾迷山组作为主力热储,顶界面埋深范围变化大,是典型的碳酸盐岩型热储层。本文旨在查明雄安新区起步区6 km以浅的地层结构和隐伏断裂,重点查明深部主力热储层空间分布及结构特征,预测地热有利区。笔者将时频电磁法应用于雄安新区地热资源勘查,通过高标准的数据采集、精细化数据处理和电阻率约束反演,利用拟地震成像技术和钻孔资料进行电阻率层位标定,精细刻画了地层形态结构。本次工作主要查明隐伏断裂8条,主体为NNE走向的正断层,控制了研究区的隆凹格局和地层分布;研究区由西向东划分为容城凸起、中间次凹、牛驼镇凸起及霸州县凹陷;雾迷山组热储层主要分布于牛驼镇凸起、容城凸起及次凹区,顶界面埋深约600~2 600 m;利用本次时频电磁法反演结果,构建了研究区三维地质模型,并从热源、通道、储层、盖层、流体等方面分析认为牛驼镇凸起区为最优的地热有利区,特别是靠近F₄下盘附近区域。

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	李戍

关键词 ：时频电磁法, 雄安新区, 深部地热, 雾迷山组热储层, 地热有利区

Abstract：

Xiong’an New Area is one of the areas with the best conditions for the development and utilization of geothermal resources in sedimentary basins of eastern China. Wumishan Formation of Jixian System is the main thermal reservoir, with buried depth of the top boundary varies greatly, which istypical carbonate type thermal reservoir. In order to find out the stratigraphic structure and concealed faults within 6 km of the starting area of Xiong’an New Area, focus on finding out the spatial distribution and structural characteristics of the main deep thermal reservoirs, and predict the favorable geothermal areas, the time-frequency electromagnetic method is applied to the geothermal resources exploration of Xiong’an New Area. Through high-standard data acquisition, refined data processing and resistivity-constrained inversion, the pseudo-seismic imaging technology and borehole data are used to calibrate the resistivity horizon, which effectively improves the reliability of interpretation results. In this work, 8concealed faults were identified, mainly NNE strike normal faults, which controlled the salient-depression pattern and stratigraphic distribution of the study area. The study area is divided into Rongcheng salient, middle sub-depression, Niutuozhen salient and Baxian depression from west to east. The thermal reservoirs of Wumishan Formation is mainly distributed in Niutuozhen salient, Rongcheng salient and middle sub-depression, with buried depth of top interface is about 600~2600m. Vsing the inversion results of the time-frequency electromagnetic method, the three-dimensional geological model of the study area is constructed, and the Niutuozhen salient area is considered to be the optimal geothermal favorable area from the aspects of heat source, channel, reservoir, caprock and fluid, especially near the footwall of F₄.

Key words： time-frequency electromagnetic method Xiong’an New Area deep geothermal exploration thermal reservoir of wumishan formation favorable geothermal area abstract

收稿日期: 2022-12-13 修回日期: 2023-02-14 出版日期: 2023-12-20

P631

基金资助:中国地质调查局项目“干热岩资源调查与勘查试采示范”(DD20230018)

通讯作者: 连晟(1985-),男,硕士研究生,高级工程师,研究方向为电磁法数据处理解释、深部地热与水文地球物理技术研究。Email:274649602@qq.com

作者简介: 程正璞(1990-),男,博士生,工程师,研究方向为电磁法数据处理解释、深部地热与油气勘查研究。Email:czp1990@126.com

引用本文:

程正璞, 连晟, 魏强, 胡文广, 雷鸣, 李戍. 雄安新区深部雾迷山组热储层时频电磁法探测研究[J]. 物探与化探, 2023, 47(6): 1400-1409.
Cheng Zheng-Pu, Lian Sheng, Wei Qiang, Hu Wen-Guang, Lei Ming, Li Shu. Research on time-frequency electromagnetic method detection of Wumishan Formation thermal reservoir in deep Xiong’an New Area. Geophysical and Geochemical Exploration, 2023, 47(6): 1400-1409.

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https://www.wutanyuhuatan.com/CN/10.11720/wtyht.2023.1611 或 https://www.wutanyuhuatan.com/CN/Y2023/V47/I6/1400

Table 1 多种地球物理勘探方法对比

Fig.1 雄安新区前中生界顶面主要构造分布(据文献[13]修编)

Table 2 研究区地层物性统计

Fig.2 时频电磁法野外施工示意

Fig.3 时频电磁数据综合处理解释流程

Fig.4 A2-A2'测线电阻率反演剖面(a)、拟地震成像(b)、地质解释剖面(c)

Fig.5 研究区断裂与重力归一化标准偏差叠合

Fig.6 蓟县系雾迷山组顶界面构造

Fig.7 研究区三维地质模型

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