基于先验信息约束的重磁电联合三维交互反演技术实践——以彭山穹隆构造为例

doi:10.11720/wtyht.2021.1220

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Abstract

Three-dimensional geological modeling is an important way to realize the background of deep mineral exploration. Based on three-dimensional modeling of ore-controlling geological bodies, this method can directly describe the spatial, genetic and evolutionary relationship between the ore controlling factors. At present, the 3D modeling mainly uses geological data, but in the absence of drilling and other known information, it is difficult to construct a reliable 3D geological model. In order to overcome the disadvantages of poor accuracy and low reliability of conventional 3D geological modeling, the authors put forward an effective method based on the prior information. In this approach, a series of sections obtained by the 2.5D interactive inversion and electrical inversion, combined with the sections of 3D physical property inversion, are employed to correct the process of building a 3D geological model. With this method, the 3D geological model of the dome structure in Pengshan area has been successfully established. On this basis, the cause of the formation of the Pengshan dome structure is discussed.

Key words： gravity magnetic and electrical constraint inversion 3D geological modeling the dome structure in Pengshan area

Received: 27 April 2020 Published: 29 April 2021

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	Articles by authors
	Yue ZHOU
	Da-Wei GUAN
	Hai-Tao YAN
	Xiao-Long ZHANG

Cite this article:

Yue ZHOU,Da-Wei GUAN,Hai-Tao YAN, et al. 3D gravity magnetic and electrical inversion modeling based on prior information: A case study of the dome structure in Pengshan area, Jiangxi Province[J]. Geophysical and Geochemical Exploration, 2021, 45(2): 308-315.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2021.1220 OR https://www.wutanyuhuatan.com/EN/Y2021/V45/I2/308

Geological setting,gravity magnetic and electrical inversion profile location of Pengshan area

Flow chart of 3D geological modeling based prior information constraint gravity magnetic and electrical inversion

Gravity anomalies of Pengshan area

Residual gravity anomalies of Pengshan area

Reduced to pole aeromagnetic anomalies of Pengshan area

Plane isoline map of resistivity inversion at 0 m above sea level

Plane isoline map of resistivity inversion at -500 m above sea level

Plane Isoline map of resistivity inversion at -1 000 m above sea level

Three-dimensional volume data display chart of automatic inversion of animal nature

Slice image of three-dimensional physical data in all directions

Physical property statistics of Pengshan area

NW5-line gravity-magnetic forward fitting interpretation interpretation diagram

2.5D invert profiles of Pengshan area

3D geological model of Pengshan area

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