基于重磁电震综合解释的三维地质建模——以南陵—宣城矿集区为例  

3D geological modeling based on joint interpretation of gravity,magnetism,electricity and seismicity:A case study of Nanling-Xuancheng ore district

作　　者：郭冬 丁文祥 兰学毅 陶龙 张媛媛 陆三明[2] GUO Dong;DING Wenxiang;LAN Xueyi;TAO Long;ZHANG Yuanyuan;LU Sanming(Geological Exploration Technology Institute of Anhui Province(Energy Exploration Center),Anhui Hefei,230031,China;Public Geological Survey Management Center of Anhui Province,Anhui Hefei 230088,China)

机构地区：[1]安徽省勘查技术院(安徽省地质矿产勘查局能源勘查中心),安徽合肥230031 [2]安徽省公益性地质调查管理中心,安徽合肥230088

出　　处：《中国地质调查》2024年第5期139-152,共14页Geological Survey of China

基　　金：安徽省公益性地质工作“南陵—宣城矿集区三维综合地球物理探测(编号:2018-g-1-4)”;国家重点研发计划“长江中下游南陵—宣城矿集区三维综合探测与深部成矿预测(编号:2016YFC0600209)”;安徽省重点研究与开发计划“复杂地质条件下页岩气资源绿色勘查关键技术综合开发利用研究(编号:2022n070203)”项目联合资助。

摘　　要：南陵—宣城矿集区近年来逐步发展为长江中下游成矿带内的第八个重要矿集区。由于地表覆盖层较厚,深部地质结构的研究相对薄弱,复杂的断裂系统和隐伏岩体尚未得到系统的三维建模与分析,严重制约了成矿规律的认识和深部找矿工作的推进。为揭示该区深部地质结构,综合利用重力、磁法、电磁法及地震等多源地球物理数据,结合钻孔和岩矿石物性等先验信息,优化隐式三维地质-地球物理建模方法,通过多源数据的联合反演和综合建模,建立了南陵—宣城矿集区的三维地质结构模型,详细刻画了区域内断裂网络、隐伏岩体及控矿地层的空间分布特征。多重先验信息约束和钻孔信息进一步提高了模型的精度和可靠性,显著提升了对深部地质结构及成矿系统的解析能力。研究结果揭示了该区控矿要素的空间分布规律,并识别出潜在有利的成矿区段,分析显示,南陵—宣城矿集区内深部岩浆活动与主要构造系统之间具有密切的成矿耦合关系,模型中识别的多个隐伏岩体和控矿地层的接触部位具有良好的找矿潜力,研究成果可为深部找矿工作提供有效的技术支撑。Nanling-Xuancheng ore district has recently emerged as the eighth significant metallogenic district within the Middle-Lower Yangtze River metallogenic belt.Due to the thick surface cover and relatively insufficient research on the deep geological structure,the complex fault systems and concealed intrusions have not yet been systematically modeled and analyzed in 3D model,which significantly restricts the understanding of metallogenic regularities and the progress of deep mineral exploration.To address this issue,the authors in this paper integrated multi-source geophysical data,including gravity,magnetism,electricity,and seismicity,along with the apriori information of borehole data and rock physical properties.And the implicit 3D geological-geophysical modeling approach was optimized to reveal the deep geological structure and provide effective technical support for deep prospecting.Through joint inversion and comprehensive modeling of multi-source data,this study established a 3D geological model of Nanling-Xuancheng ore district,which delineated the spatial distribution characteristics of fault networks,concealed intrusions,and ore-controlling strata in detail.The incorporation of multiple apriori information constraints and borehole information further improved the model s precision and reliability,significantly enhancing the interpretation ability of deep geological structures and metallogenic systems.The results revealed the spatial distribution regularities of ore-controlling factors and identified potential favorable mineralization zones.The findings suggest that there is a close metallogenic coupling relationship between deep magmatic activity and the primary fault systems in Nanling-Xuancheng ore district,and that several contact zones between the identified concealed intrusions and ore-controlling strata have promising mineralization potential.

关 键 词：先验信息 联合反演 南陵—宣城矿集区 三维地质建模 深部找矿 

分 类 号：P631[天文地球—地质矿产勘探]