矿区重力三维物性反演的参考模型构建方法及应用  

Construction and application of reference model to three-dimensional property inversion of gravity data in the mining area

作　　者：周俊杰[1] 陈聪[1] 喻翔[1] 高玲举 陈涛[1] ZHOU Jun-Jie;CHEN Cong;YU Xiang;GAO Ling-Ju;CHEN Tao(Beijing Research Institute of Uranium Geology,Beijing 100029,China)

机构地区：[1]核工业北京地质研究院,北京100029

出　　处：《物探与化探》2020年第4期878-885,共8页Geophysical and Geochemical Exploration

基　　金：预研项目(3210402);核工业北京地质研究院青年科技创新基金“重磁资料的三维约束反演研究”(物QJ1801)。

摘　　要：矿区重力数据三维约束反演是摸清深部成矿环境的重要技术手段,其关键在于有效地引入先验信息。参考模型是一种简单有效的约束引入方法,可显著提升反演质量。本文探讨实际应用中参考模型的构建方法,将地质图、物性统计以及地层界面信息有效引入到反演中,获得符合地质认识的可靠结果。在张麻井矿区构建参考模型约束并进行重力三维反演,约束反演结果与地表露头信息相符,且与钻孔揭示的层位信息吻合,而无约束结果与实际差异较大。因此,构建参考模型约束有较高的实用价值,对改善重力三维反演结果具有重要作用,值得推广应用。Three-dimensional constrained inversion of gravity data in the mining area is an important technique for deep metallogenic environment exploration. The key point of the gravity inversion is the introduction of prior information. The reference model is a simple and effective constraint method, which can significantly improve the inversion quality. This paper discusses the construction of reference model in practice. Geological map, physical property statistics and interface information serve as parts of the import to obtain reliable results which accord with geological understanding. A reference model constraint was constructed and three-dimensional inversion of gravity data was performed in the Zhangmajing ore district. The inversion results are consistent with the surface outcrop information and the formation information revealed by the boreholes. The unconstrained results are quite different from the actual geological condition. Therefore, it is of high practical value to construct the reference model constraint to handle the inversion work. It is worthful and applicable in improving the gravity data inversion results.

关 键 词：重力数据 三维反演 参考模型 约束 张麻井矿区 

分 类 号：P631[天文地球—地质矿产勘探]