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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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

Received: 13 December 2022 Published: 23 January 2024

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	Zheng-Pu Cheng
	Sheng Lian
	Qiang Wei
	Wen-Guang Hu
	Ming Lei
	Shu Li

Cite this article:

Zheng-Pu Cheng,Sheng Lian,Qiang Wei, et al. Research on time-frequency electromagnetic method detection of Wumishan Formation thermal reservoir in deep Xiong’an New Area[J]. Geophysical and Geochemical Exploration, 2023, 47(6): 1400-1409.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2023.1611 OR https://www.wutanyuhuatan.com/EN/Y2023/V47/I6/1400

List of comparison of various geophysical exploration methods

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Main structural distribution on the top surface of the pre Mesozoic in Xiong'an New Area(revised by reference[13])

Statistics of physical properties of strata in the study area

Schematic of TFEM exploration field construction

Flow chart of comprehensive processing and interpretation of time-frequency electromagnetic data

Resistivity inversion profile(a), pseudo-seismic imaging map(b) and geological interpretation profile(c) of A2-A2' survey line

Overlapping map of faults and gravity normalized standard deviation in the study area

Structural of top boundary of Wumishan Formation of Jixian System

3D geological model of the study area

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