湖南铲子坪金矿床矿体三维地质模型构建

2021-01-15 00:44:40曾玉清,范春玉,张爽,刘助龙,谢敏涛,刘和生
国土资源导刊 2021年4期

曾玉清,范春玉,张爽,刘助龙,谢敏涛,刘和生

摘 要 以湖南铲子坪金矿床为研究对象,探索三维地质勘探工程数据库、地层及矿体模型的建设,以期为金矿床三维地质模型的建立提供示范。在矿体建模过程中,采用金品位双指标法,精确地反映了矿体的产状和分布,与传统方法相比提高了模型精度。基于三维矿体模型,运用统计学法开展资源储量估算,并与传统块段法运算结果进行对比,其各项指标相对误差均在允许范围内,统计学法在储量估算中更加合理且切合实际、速度更快。

关键词 三维地质模型;品位双指标法;铲子坪金矿床

中图分类号:P628.4 文献标识码:A

Construction of 3D Ore Body Geological Model of Chanziping Gold Deposit in Hunan Province

Zeng Yuqing1,3 , Fan Chunyu1 , Zhang Shuang2 , Liu Zhulong1,3 , Xie Mintao4 , Liu Hesheng1

(1. Hunan Center of Natural Resources Affairs ,Changsha Hunan 410004;

2.Changsha Digital Mine Co.,Ltd, Changsha Hunan 410006 ; 3.Hunan Key Laboratory of Remote Sensing, Monitoring of Ecological Environment in Dongting Lake Area Changsha Hunan 410004; 4.Hunan Bureau of Geology and Mineral Exploration and Development Bureau 407 Teams, Huaihua Hunan 418000)

Abstract: With the Chanziping gold deposit in Hunan as the object, the construction of the 3D model for geological exploration engineering database, stratum and ore body was explored to demonstrate the establishment of 3D geological model of gold deposit. During ore body modeling, the gold grade double-index method was adopted to exactly reflect the occurrence and distribution of ore body and the accuracy of the model is improved compared with the traditional method. In addition, based on the 3D ore body model, the statistical method was used to estimate the resource reserves. Compared with the calculation results of the traditional block method, the relative differences of all indexes are within the allowable range. The statistical method is more reasonable, practical and quicker for reserve estimation.

Keywords: 3D geological model; grade double-index method; Chanziping gold deposit

鏟子坪金矿床地处湖南省洪江市东北部,处于雪峰弧形构造带西南段,是湖南省发现最早的破碎带蚀变岩型金矿床[1],也是湖南“一带五区”中会同—洪江地区金矿找矿勘查的重点矿区。前人在该区域主要以传统手段,从地质特征、控矿因素、成矿时代、成矿物质来源、矿床成因等理论方面开展研究[2-5],而较少引入三维技术辅助地质找矿和资源管理。本文从金矿床三维地质建模技术方面,引入双指标法,探索薄脉状矿体三维地质建模的可行性与精确性,并尝试开展基于三维矿体模型的资源储量估算,让三维可视化技术辅助湖南“一带五区”的地质找矿和矿产资源管理工作。

1 区域地质概况

1.1 赋矿围岩

该区分布的地层主要为新元古界板溪群以及南华系长安组,长安组为金矿的赋矿地层(见图1),长安组第一段主要为灰绿色厚层条带状绢云板岩、粉砂质板岩;第二段主要为一套灰绿色块状冰碛含砾砂质板岩夹粉砂质板岩、砂岩透镜体,金丰度为1.44×10-9~2.77×10-9。……

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