综合物探技术在深部碳酸盐岩热储探测中的应用研究——以雄安新区为例

doi:10.11720/wtyht.2023.1354

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Abstract

Xiong'an New Area has great potential for geothermal resources. Carbonate rocks are favorable reservoirs for deep geothermal resources in this area. The integrated geophysical exploration technology is an effective way to ascertain the deep structures and the characteristic stratigraphic structure of carbonate geothermal reservoirs. Aiming at the exploration target of deep carbonate geothermal reservoirs, this study put forward a surface-line-point hierarchical and progressive geophysical exploration model. Using the high-precision gravity and aeromagnetic data, this model first investigated the distribution range of carbonate rocks, the thickness of carbonate strata, the distribution of deep-seated faults, and the fluctuation of bedrocks. Then, it analyzed the low-resistivity anomalies of geothermal reservoir strata using the magnetotelluric method. Finally, this model finely characterized the geothermal reservoir strata using two-dimensional seismic profiles and analyzed the velocity structure and regional structural characteristics of anomaly zones in the geothermal field. Based on the exploration precision and reliability of gravity, aeromagnetic, magnetotelluric, and seismic geophysical methods in the geothermal resource exploration of different stages, as well as other factors such as construction cost and efficiency, this study analyzed the economic applicability of geophysical methods in the exploration of deep karst geothermal reservoirs and suggested that the carbonate geothermal resources should be explored using the geophysical exploration technology combination of gravity, magnetic, and magnetotelluric methods.

Key words： Xiong'an New Area geothermal carbonate rock economic applicability geophysical exploration

Received: 13 July 2022 Published: 11 October 2023

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	Zhao ZHANG
	Quan-Zeng YIN
	Long-Fei ZHANG
	Da-Ming ZHANG
	Shi-Hui ZHANG
	Guo-Shu HUANG
	Shi-Feng ZHAO
	Biao YANG
	Li-Xun TAI
	Deng-Liang ZHANG
	Jin-Chao WANG
	Gang DUAN

Cite this article:

Zhao ZHANG,Quan-Zeng YIN,Long-Fei ZHANG, et al. Application of the integrated geophysical exploration technology in the exploration of deep carbonate geothermal reservoirs: A case study of the Xiong'an New Area[J]. Geophysical and Geochemical Exploration, 2023, 47(4): 926-935.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2023.1354 OR https://www.wutanyuhuatan.com/EN/Y2023/V47/I4/926

Geological structure distribution of Xiong'an New Area and geophysical work distribution of the study area

		地层代号	岩性	平均密度/(g·c $m - 3$ )	磁化率κ/10^-5SI	电阻率/(Ω·m)
新生界	第四系	Q	亚黏土、砂土、	2.05	55~610	5~12
	新近系	Nm	粉砂岩、细砂岩、含砾砂岩	2.21	0~200	4~15
	新近系	Ng	砂岩、含砾砂岩、泥岩	2.21	5~80	3~6
	古近系	Ed+Es	泥岩、粉砂岩、细砂岩、砂泥岩	2.4	0~500	1~10
古生界	石炭—二叠系	C-P	泥岩、砂岩、含砾砂岩	2.50	0~50	10~35
古生界	寒武—奥陶系	?-O	灰岩、白云质灰岩	2.67	0	40~60
元古宇		Pt	泥岩、灰岩、白云岩	2.7	0~200	>50
太古宇		Ar	片岩、片麻岩、变粒岩、斜长角闪岩、混合岩、大理岩	2.73	1500~8500

Physical parameters of strata in the working area

Analysis of residual gravity anomaly in Xiong'an New Area
a—qravity anomaly in the study area;b—gravity inversion of A-A' line

Study area 1:50,000 to geomagnetic pole after aeromagnetism ΔT anomaly

Magnetization inversion section across A-A' line

Inversion resistivity profile and geological interpretation profile of line D3

Geological geophysical comprehensive interpretation section of A-A' line
a—gravity and magnetic anomaly profile;b— magnetization inversion profile;c—gravity inversion profile;d—magnetotelluric inversion profile; e—comprehensive interpretation of geological profile

2D seismic survey line in the south of Rongcheng uplift

Seismic wave anomaly analysis
a—amplitude attribute; b—instantaneous frequency

List of accuracy and reliability of geophysical methods in detecting deep thermal storage

Proportion statistics of geothermal exploration in different stages

Histogram of exploration accuracy and reliability weight of geophysical method in detecting deep thermal reservoir

Proportion of geothermal in geophysical exploration

Statistics of weight proportion of economic applicability evaluation items based on priority chart method

Proportion of economic applicability evaluation of geothermal resources detected by geophysical methods

Histogram of economic applicability of geophysical method to detect deep thermal reservoir

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