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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摘要

三维地质建模是实现深部矿产勘查突破的重要途径,其通过控矿地质体的三维建模,直观刻画控矿要素之间的空间、成因和演化关系,帮助理解成矿系统,开展深部找矿预测。当前三维建模主要采用地质资料构建,在缺少钻孔等已知资料的情况下,难于构建出可靠的三维地质模型。为了克服常规三维地质建模方法可信度低、精度差的缺点,本文将重磁电交互反演技术引入到三维地质建模中,提出了基于先验信息约束,通过重磁二度半剖面交互反演、电法反演、三维物性反演联合修正的三维地质模型方法。本文采用该方法建立了彭山穹隆的三维地质模型,并在此基础上对彭山穹隆的成因进行了讨论。

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	周月
	官大维
	延海涛
	张小龙

关键词 ：重磁电约束反演, 三维建模, 彭山穹隆构造

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

收稿日期: 2020-04-27 修回日期: 2020-07-15 出版日期: 2021-04-20

ZTFLH:

P631

基金资助:中国地质科学院地球物理与地球化学研究所项目“长江下游重点盆地地球物理基础调查”(DD20201164)

作者简介: 周月(1990-),男,工程师,主要从事地球物理勘查与综合研究工作。Email: 1003087497@qq.com

引用本文:

周月, 官大维, 延海涛, 张小龙. 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[J]. 物探与化探, 2021, 45(2): 308-315.
ZHOU Yue, GUAN Da-Wei, YAN Hai-Tao, ZHANG Xiao-Long. 3D gravity magnetic and electrical inversion modeling based on prior information: A case study of the dome structure in Pengshan area, Jiangxi Province. Geophysical and Geochemical Exploration, 2021, 45(2): 308-315.

链接本文:

https://www.wutanyuhuatan.com/CN/10.11720/wtyht.2021.1220 或 https://www.wutanyuhuatan.com/CN/Y2021/V45/I2/308

Fig.1 彭山地区区域地质、重磁反演剖面位置

Fig.2 基于先验信息约束重磁电反演的三维地质建模技术流程

Fig.3 彭山地区布格重力异常

Fig.4 彭山地区剩余布格重力异常

Fig.5 彭山地区航磁化极异常

Fig.6 海拔0 m反演电阻率平面等值线

Fig.7 海拔-500 m反演电阻率平面等值线

Fig.8 海拔-1 000 m反演电阻率平面等值线

Fig.9 三维自动物性反演体数据显示

Fig.10 三维物性体数据各方向切片

Table 1 彭山地区物性统计

Fig.11 NW5线重磁重磁正演拟合解释推断

Fig.12 彭山地区2.5D反演剖面三维空间分布

Fig.13 彭山地区三维地质模型立体图

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