许加田, 薛东剑, 李阳. 2023: 综合多源数据的矿床三维地质建模——以四川某铅锌矿为例. 地质通报, 42(7): 1203-1210. DOI: 10.12097/j.issn.1671-2552.2023.07.011
    引用本文: 许加田, 薛东剑, 李阳. 2023: 综合多源数据的矿床三维地质建模——以四川某铅锌矿为例. 地质通报, 42(7): 1203-1210. DOI: 10.12097/j.issn.1671-2552.2023.07.011
    XU Jiatian, XUE Dongjian, LI Yang. 2023: Three-dimensional geological model of deposits with the integration of data of multi-sources: a case study of lead-zinc deposit, Sichuan Province. Geological Bulletin of China, 42(7): 1203-1210. DOI: 10.12097/j.issn.1671-2552.2023.07.011
    Citation: XU Jiatian, XUE Dongjian, LI Yang. 2023: Three-dimensional geological model of deposits with the integration of data of multi-sources: a case study of lead-zinc deposit, Sichuan Province. Geological Bulletin of China, 42(7): 1203-1210. DOI: 10.12097/j.issn.1671-2552.2023.07.011

    综合多源数据的矿床三维地质建模——以四川某铅锌矿为例

    Three-dimensional geological model of deposits with the integration of data of multi-sources: a case study of lead-zinc deposit, Sichuan Province

    • 摘要: 四川某铅锌矿床深部存在一产状平缓的滑覆构造, 在地下深部分布广泛, 但地表无明显露头。传统的二维地质剖面难以展示全貌, 因此通过GOCAD软件建立三维地质模型, 展现该矿床地下地质结构与构造。首先以DEM、填图、钻孔、勘探线剖面、卫星遥感影像等多源数据建立地质数据库, 构建地形地貌模型; 然后利用地表填图和勘探线联合剖面的断层线建立断层模型, 确定了构造格架, 展现滑覆构造的产状分布; 其次利用钻孔品位数据进行空间变差函数分析, 在含矿层位进行克里金插值, 构建矿体模型, 并结合钻孔分层数据建立地层模型; 最终建立了综合地表、构造、矿体和地层的三维地质实体模型。在此基础上剖切实体模型, 讨论各地质单元的形态特征, 探讨深部成矿前景。结果表明, 通过综合该研究区多源数据的三维地质建模, 能将勘查过程中产生的原始资料整合在一个模型中, 该模型清晰地展示了地下地层、构造、矿体的产状与接触关系, 揭露隐伏构造, 并且在建模过程中能从三维角度检查原始数据的正确性, 提高认识, 为研究区深部找矿工作提供参考依据。

       

      Abstract: In the exploring work of a lead-zinc deposit in Sichuan Province, a gliding nappe structure was discovered which is deeply under the ground with gentle occurrence, widely distributed but had no clear outcrops on the ground surface.Traditionally the gliding nappe structure can be hardly represented in the two-dimensional geological cross sections, so it's necessary to construct a three-dimensional geological model to present the geological structures based on the GOCAD software.First, this paper built a database which includes DEM, geological maps, boreholes, prospecting line sections, satellite images and many other multi-sources primary geological data.Second, we construct a structure model based on fault lines in the geological maps and prospecting line sections, then established structural framework, displayed the occurrence and distribution of the gliding nappe structure.Third, through the variation function analyzer to analyze the lead-zinc grade, this paper used kriging interpolation with trend on the ore-bearing layer and built orebody grade distribution model and construct stratigraphy model combined with borehole data.Finally, we construct a three-dimensional geological entity model which include topography, structure, orebody and stratigraphy.Through the straight section based on the model, we discussed the morphological characteristics of geological units and deep mineralization prospect.The result shows that the modeling of the area with the integration of multi-sources data, can build an effective entity model to integrate original data generated during the prospecting period.The model shows the relationships between stratigraphy, structure and orebody clearly, revealed hidden structure.Particularly we can check the accuracy of primary data and improve cognition with the sight of three dimensional in the progress of modeling and provide reference for deep prospecting work in the study area.

       

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