黑龙江多宝山矿集区三维地质建模与深部找矿预测  

Three-Dimensional Geological Modeling and Deep Prospecting Prediction of the Duobaoshan OreConcentration Area in Heilongjiang Province

作　　者：许逢明[1,2] 赵院冬 李成立[1] 崔健 吴大天 孙巍[1] XU Fengming;ZHAO Yuandong;LI Chengli;CUI Jian;WU Datian;SUN Wei(Shenyang Center of China Geological Survey,Shenyang,Liaoning 110034;School of Earth Sciences and Resources,China University of Geosciences(Beijing),Beijing 100083;Comprehensive Survey Center of Mudanjiang Natural Resources,China Geological Survey,Mudanjiang,Heilongjiang 157000;East China Mineral Exploration and DevelopmentBureau,Nanjing,Jiangsu 210007)

机构地区：[1]中国地质调查局沈阳地质调查中心,辽宁沈阳110034 [2]中国地质大学(北京),地球科学与资源学院,北京100083 [3]中国地质调查局牡丹江自然资源综合调查中心,黑龙江牡丹江157000 [4]江苏省有色金属华东地质勘查局,江苏南京210007

出　　处：《地质与勘探》2022年第3期629-652,共24页Geology and Exploration

基　　金：国家重点研发计划深地资源勘查开采专项项目(编号:2017YFC0601305);中国地质调查局地质调查项目(编号:DD20201162)联合资助。

摘　　要：随着三维地质信息技术的发展,三维地质建模和深部成矿预测研究对实现深部找矿突破的作用越来越重要。本次基于已知矿区的中段、勘探线剖面图及钻孔数据等资料,依托Micromine平台,从矿床尺度(比例尺11000)建立了黑龙江多宝山铜矿、铜山铜矿的地质体和蚀变矿化体两类三维地质实体模型。以地表地质图、图切地质剖面、钻孔数据及岩石物性数据为约束,基于重磁电三维物性反演,综合解译了93条重磁电剖面。在综合剖面地质解译成果的基础上,利用平行剖面显式建模技术,从矿集区尺度(比例尺12.5万)建立了多宝山矿集区84 km^(2)范围内3000 m以浅三维地质体实体模型。在三维地质体模型的基础上,以多宝山、铜山铜矿体三维地质模型为先验数据模型,根据区域找矿模型,利用“立方体预测模型”法,提取与成矿有关的二值变量(地层、岩体、构造)、连续变量(重、磁、电)等7个勘探变量,利用GeoCube3.0逻辑斯蒂回归深层次机器学习集成模块,开展了研究区的勘探变量集成,经由ROC模型评估后验概率,在可靠后验概率的基础上,利用C-V分形方法计算阈值以圈定深部找矿有利靶区,综合圈定深部找矿靶区8处,预估铜潜在资源量634万吨。按照靶区综合评级排序,对最优靶区A-8开展钻探验证,经证实深部发现厚大铜钼矿体,实现了多宝山矿集区深部找矿的重大突破。With the development of 3D geological information technology,the role of 3D geological modeling and deep metallogenic prognosis and research increases in importance to achieve deep prospecting breakthroughs.Grounded upon the data of the middle section of the known mining area,the exploration profile and drilling data,two types of 3D geological solid models for the geological bodies and altered mineralization bodies of the Duobaoshan copper mine and the Tongshan copper mine were established from the scale of the deposit(at a scale of 11000).Constrained by surface geological maps,map-cut geological sections,borehole data and petrophysical data,93 gravity,magnetic,electroseismic profiles were comprehensively interpreted.On the basis of comprehensive geological interpretation on the profiles and the parallel profile explicit modeling technology,a 3D physical model of geological bodies(shallower than 3,000 m)was constructed from the scale of the mining area(at a scale of 125,000).Upon the 3D geological body models and with the 3D geological model of the Duobaoshan and Tongshan copper ore bodies used as the prior data model,seven exploration variables including the metallogeny-related binary variables(stratum,rock mass,structure)and continuous variables(gravity,magnetism,electricity)were extracted according to the deep prospecting prediction model and with the method of“cube prediction model”.The GeoCube 3.0 deep machine learning integration modules(logistic regression methods)were used for integration of exploration variables in the study area,and the posterior probability was also evaluated through ROC model.On the basis of the reliable posterior probability,the concentration-volume fractal method was used to calculate the threshold to delineate favorable target areas for deep prospecting,and six deep prospecting target areas were comprehensively delineated to estimate the volume of copper resources at 6.34 million tons.According to the comprehensive ranking of the target area,drilling verification was carried ou

关 键 词：三维地质建模 找矿预测 靶区圈定 钻探验证 多宝山矿集区 黑龙江省 

分 类 号：P628.1[天文地球—地质矿产勘探]