综合物探方法在内蒙古敖汉旗林家地地热资源勘查中的应用试验

doi:10.11720/wtyht.2024.1315

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摘要

在“碳达峰、碳中和”双碳目标背景下,如何科学、高效地进行地热资源的勘查开发是地热产业的关键问题。本文针对目前普遍关注的中深层地热资源勘查技术难题,以内蒙古敖汉旗林家地为研究区,开展了综合地球物理勘探方法的有效性试验研究。在区域地质条件和水文地质条件分析基础上,初步查明了敖汉旗林家地一带地温场特征和地下水化学特征;运用可控源音频大地电磁法(CSAMT)、微动测深和放射性氡气剖面测量多种方法组合,基本查明了研究区地层、岩浆岩及断裂构造的分布,推测了地热异常区控制因素及热水运移情况,并据此设定了勘探孔位,进行了960 m钻探验证。结果表明:综合运用可控源音频大地电磁法和微动测深等物探方法,并结合放射性氡气剖面测量进行辅助验证,对开展中深层地热资源勘查较为有效,可为其他地区地热资源勘查提供方法参考。

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	韩术合
	裴秋明
	许健
	宋志勇
	莫海斌

关键词 ：可控源音频大地电磁法, 微动测深, 放射性氢气剖面测量, 地热, 中深层地热资源, 华北陆块北缘

Abstract：

In the context of the goals of both peak carbon dioxide emissions and carbon neutrality, scientific and efficient exploration and exploitation of geothermal resources are criticalfor the geothermal industry. To address the commonly concernedtechnical challenges in the exploration of moderately deep geothermal resources, this study investigated the effectiveness of comprehensive geophysical prospecting in the exploration of geothermal resources inthe Linjiadi area, Aohan Banner, Inner Mongolia. Based on the analysis ofthe geological and hydrogeological conditions, this studypreliminarilyascertainedthe geothermal field characteristicsand the hydrochemicalcharacteristics of groundwater in the Linjiadi area. By comprehensively employingcontrolled source audio-frequency magnetotellurics (CSAMT), CSAMT; microtremor survey; radioactive radon survey; this study roughly determined the distribution of strata, magmatic rocks, and fault structures in the study area, inferring the factors controllinggeothermal anomaly areas and hot-water migration.Accordingly, exploration boreholes were arranged, allowing for drilling verificationwith a total length of 960 m. The results show that the comprehensiveapplication of CSAMT and microtremor survey, combined with radioactive radon survey for auxiliary verification, is effective in exploringmoderately deep geothermal resources. This study will provide a methodological reference for geothermal resource exploration in other areas.

Key words： CSAMT microtremor survey radioactive radon survey geothermal resource moderately deep geothermal resources northern margin of the North China block

收稿日期: 2023-07-25 修回日期: 2023-10-24 出版日期: 2024-08-20

ZTFLH:	P631
	P314.3

基金资助:国家自然科学基金项目(42072313);国家自然科学基金项目(42102334);敖汉旗自然资源局项目“敖汉旗林家地热水汤一带地热资源预可行性勘查”(CFZCAHS-C-F-220017)

通讯作者: 裴秋明(1989-),男,硕士生导师,博士,主要从事地质资源与地质工程领域的教学与科研工作。Email:pqm@swjtu.edu.cn

作者简介: 韩术合(1985-),男,高级工程师,博士,主要从事矿产资源勘查、生态修复等工作。Email:hanshuhe1985@qq.com

引用本文:

韩术合, 裴秋明, 许健, 宋志勇, 莫海斌. 综合物探方法在内蒙古敖汉旗林家地地热资源勘查中的应用试验[J]. 物探与化探, 2024, 48(4): 962-970.
HAN Shu-He, PEI Qiu-Ming, XU Jian, SONG Zhi-Yong, MO Hai-Bin. Application of comprehensive geophysical prospecting in the exploration of geothermal resources in the Linjiadi area, Aohan Banner, Inner Mongolia. Geophysical and Geochemical Exploration, 2024, 48(4): 962-970.

链接本文:

https://www.wutanyuhuatan.com/CN/10.11720/wtyht.2024.1315 或 https://www.wutanyuhuatan.com/CN/Y2024/V48/I4/962

Fig.1 敖汉旗林家地热水汤一带地质简图

水样编号	取样位置	F^-/ (mg·L^-1)	H₂SiO₃/ (mg·L^-1)	Na⁺/ (mg·L^-1)	$S O 4 2 -$ / (mg·L^-1)
SH3	德力胡同	0.51	19.2	11.16	54.56
SH7	老阳坡	0.42	18.91	10.40	36.86
SH8	汤西沟	0.45	20.37	11.32	48.66
SH9	变电所	1.85	39.57	66.60	122.39
SH10	黑火药库	0.38	19.79	10.11	36.86
SH11	汤北沟	0.27	18.91	11.12	53.09
SH12	热水汤	0.51	18.04	14.79	92.90
SH13	庙房身	0.60	19.20	12.29	60.46
SH14	车杖子	0.64	20.96	9.13	33.93
SH15	小梁前	0.45	16.89	8.55	36.88
SH16	韩家沟	0.36	24.46	8.52	30.98
SH17	彭家沟	0.38	19.22	9.59	41.31
SH18	大西沟	0.31	25.04	8.03	44.26
SH21	热水汤	0.73	19.78	15.62	66.83
SH22	林家地	2.01	36.17	28.42	41.28

Table 1 地热特有组分水质分析结果

Fig.2 L5线CSAMT反演电阻率推断

Fig.3 微动反演断面

Fig.4 L5氡气综合剖面

Fig.5 综合物探方法结果对比验证

Table 2 ZK1钻孔地层结构

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