深埋铁矿磁测数据三维反演分析与找矿靶区预测

doi:10.11720/wtyht.2019.0244

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Abstract

The search for deep buried iron deposits is a very complicated exploratory study. The current difficulty is that the ferromagnetic anomalies are small and submerged in large magnetic intrusive rock masses. It may cause large deviations and increase the risk of exploration. With the rapid development of computer technology, large-scale three-dimensional inversion has become a reality. This paper uses GMES-3DI commercialization software to automatically invert the area magnetic data of Qihe-Yucheng area in Shandong Province, and obtains the magnetic susceptibility of underground space in this area. Based on the distribution and combined with the existing geological data of boreholes, the authors revealed the characteristics of the magnetic susceptibility contours with high value traps in the presence of iron ore, with the trap center being about 500 m shallower than the actual orebody position. Based on this feature, the authors used the three-dimensional magnetic susceptibility data retrieved from the exploration area to search for areas with high magnetic anomaly traps in the north-south and east-west directions and, as a result, delineated two relatively reliable prospecting targets.

Key words： magnetic exploration deep buried iron ore three-dimensional inversion of magnetic survey data prediction of prospecting target

Received: 28 April 2019 Published: 28 November 2019

P618

Corresponding Authors: Jian-Ke QIANG E-mail: qiangjianke@163.com

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	Yu-Zhen ZHU
	Jian-Ke QIANG
	Lin-Fei WANG
	Wen-Yan ZHANG
	Shi-Kun DAI

Cite this article:

Yu-Zhen ZHU,Jian-Ke QIANG,Lin-Fei WANG, et al. Three-dimensional inversion analysis of magnetic data from deep buried iron ore and prediction of prospecting target area[J]. Geophysical and Geochemical Exploration, 2019, 43(6): 1182-1190.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2019.0244 OR https://www.wutanyuhuatan.com/EN/Y2019/V43/I6/1182

A sketch of regional geological structure

Diagram of magmatic rock distribution in the region

The contours of 1:10,000 high-precision magnetic anomalies on the ground

A sketch of three-dimensional inversion slices of magnetic data
a—distribution of measured data;b—3D inversion susceptibility slicing;c—3D inversion susceptibility horizontal slicing;d—3D inversion susceptibility greater than 0.0105SI

Three-dimensional inversion of magnetic susceptibility contours of eight horizontal slices

The susceptibility contours of ZK1 and ZK0701 N-S profiles

The susceptibility contours of the East-West profile of ZK1 and ZK0701
a—the north-south coordinate is 72196;b—the north-south coordinate is 71776

Predicts the north-south-west-east susceptibility contour profile of No. 1 anomaly
a—the north-south coordinate is 75131;b—the east-west coordinate is 51195

Predicts the north-south-west-east magnetic susceptibility contour profile of anomaly No. 2
a—the north-south coordinate is 708021;b—the east-west coordinate is 57610

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