李叶飞,欧健,莫亚军,杨富强,区小毅,诸葛华,刘嵘.地球物理方法在北部湾干热岩探测中的应用[J].矿产勘查,2024,15(9):1634-1641 |
地球物理方法在北部湾干热岩探测中的应用 |
Application of geophysical methods in the detection of hot dry rocks in the Beibu Gulf |
投稿时间:2024-08-03 修订日期:2024-09-29 |
DOI:10.20008/j.kckc.202409008 |
中文关键词: 地球物理方法 干热岩 北部湾 |
英文关键词: geophysical method dry hot rock Beibu Gulf |
基金项目:本文受广西壮族自治区地质矿产勘查开发局部门预算前期工作科研项目“广西三维岩石圈结构建模与深部成矿背景研究”(桂地矿综研[2022]16号)、桂地矿综研[2023]9号)、(桂地矿函[2024]67号)与广西地球物理深部探测技术与试验研究人才小高地项目(桂地矿办[2023]55号)、湖南省地质灾害监测预警与应急救援工程技术研究中心开放基金(hndzgczx202401)、湖南省重大科技攻关项目(2023ZJ1090)联合资助。 |
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中文摘要: |
地球物理方法在干热岩探测中是一种重要的手段,为圈定广西北部湾干热岩远景区,本文利用大地电磁法和重力对广西北部湾进行了探测并分析,结合广西北部湾的地质构造、物性特征、深大断裂及岩体等特征,大地电磁法通过Robust处理,采用二维非线性共轭梯度(NLCG)反演,对重力资料采用2.5维可视化反演,对重力剖面进行拟合定量正演。根据物探成果,本文分析并推断了北部湾地区的热储结构、深部热源、深大断裂、莫霍面、上地幔及岩体的空间展布,并且推断了3条主要的热源通道,圈定了西场盆地为远景区;结果证明,以大地电磁法为主,重力勘探为辅,两种方法相辅相成,在广西北部湾干热岩探测中取得了不错的效果,在干热岩勘查中是可行的,认为西场盆地为北部湾干热岩成矿远景区,并建立了概念模型,为下一步北部湾干热岩探测及干热岩潜力评价提供了物探依据。 |
英文摘要: |
Geophysical method is an important means in the detection of hot dry rocks. In order to delineate the prospect area of hot dry rocks in the Beibu Gulf of Guangxi, this paper probes and analyzes the Beibu Gulf of Guangxi by using magnetotelluric method and gravity. Combined with the geological structure, physical characteristics, deep faults and rock mass of the Beibu Gulf of Guangxi, the Robust processing is performed by magnetotelluric method. The two-dimensional nonlinear conjugate gradient (NLCG) inversion is used, the gravity data is retrieved by 2.5-dimensional visual inversion, and the gravity profile is fitted quantitatively forward modeling. Based on the results of geophysical exploration, the spatial distribution of heat storage structure, deep heat source, deep fault, Moho surface, upper mantle and rock mass in the Beibu Gulf area is analyzed and inferred, and three main heat source channels are inferred, and Xichang Basin is delineated as a prospect area. The results show that the two methods complement each other and achieve good results in the dry hot rock exploration of the Beibu Gulf in Guangxi. Xichang Basin is considered to be the dry hot rock metallogenic prospect of the Beibu Gulf, and a conceptual model is established, which provides a geophysical basis for the further dry hot rock exploration and potential evaluation of the Beibu Gulf. |
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