山东齐河-禹城地区三维重磁建模与找矿预测  

3D Gravity and magnetic modelling and prospecting in Qihe-Yucheng Area, Shandong Provinces

作　　者：吕婧祎 宁振国 祁光[3] 朱学强[4] 胡雪平[4] 佘京瑾 周强 LV Jingyi;NING Zhenguo;QI Guang;ZHU Xueqiang;HU Xueping;SHE Jingjin;ZHOU Qiang(China Communications Information Technology Group Co.,Ltd.,Beijing 100088,China;Shandong Institute of Geological Sciences,Jinan 250013,China;Chinese Academy of Geological Sciences,Beijing 100037,China;Shandong Institute of Geological Surveying,Jinan 250014,China;Shandong Zhengyuan Construction Engineer Co.,Ltd.Ji'nan Branch,Jinan 250101,China)

机构地区：[1]中国交通信息科技集团有限公司,北京100088 [2]山东省地质科学研究院,济南250013 [3]中国地质科学院,北京100037 [4]山东省地质调查院,济南250014 [5]山东正元建设工程有限责任公司济南分公司,济南250101

出　　处：《物探化探计算技术》2024年第5期573-583,共11页Computing Techniques For Geophysical and Geochemical Exploration

基　　金：中国地质科学院基本科研业务费项目(JKYZD202303);山东省地勘项目(鲁勘字[2021]1号,[2020]63号)。

摘　　要：山东省齐河-禹城矿集区是近年来发现的富铁矿矿集区,矿石品位高、储量大,有望成为中国重要的富铁矿基地。在成岩成矿时代、控矿构造、赋矿层位和找矿规律等矿床学研究方面开展了大量工作,并取得了很多成果。但由于该区处于第四系厚覆盖层区,深部异常信息难以获取,对矿区深部构造样式、隐伏岩体空间形态及规模、主要控矿地层的空间展布等问题还没有得到有效解决,严重制约了矿床规模的进一步扩大。利用重磁约束的三维地质建模技术已成为深部找矿的重要手段,它利用先验信息进行约束反演弥补重磁纵向分辨力的不足,对成矿异常的空间性质进行判断或追踪已知矿带的深部延伸,从而实现找矿预测。笔者基于齐河-禹城地区1:50 000重力数据和1:25 000航磁数据,进行位场分离获得反演基础数据,在地质、钻孔和物性资料的约束下,完成了19条剖面的交互式反演,利用剖面反演结果建立了研究区三维地质模型,获取了地下约3 km深度的地层、岩体、构造的空间信息,并以此为基础结合成矿规律和控矿因素提出5处找矿新靶区。The iron-rich ore area discovered in recent years in the Qihe-Yucheng ore concentration area of Shandong Province has high ore grades and large reserves,and is expected to become an important iron-rich ore base in China.A lot of work has been done in the study of ore deposits,such as diagenetic and metallogenic times,ore-controlling structures,ore-bearing horizons,and ore-prospecting laws,and many achievements and understandings have been obtained.However,because the area is located in the Quaternary thick overburden area,it is difficult to obtain deep anomaly information.The deep structural style of the mining area,the spatial form and scale of the hidden rock mass,and the spatial distribution of the main ore-controlling strata have not been effectively solved.Seriously restrict the further expansion of the scale of the deposit.Three-dimensional geological modeling technology with gravity and magnetic constraints has become an important means of deep ore prospecting.It uses prior information for three-dimensional inversion to improve vertical resolution of gravity and magnetic data.It can be used to track the deep extension of known ore belts,or to judge the nature of important metallogenic anomalies,so as to achieve ore prospecting prediction.In this paper,the latest measurement is used to obtain 1:50,000 gravity data and 1:25,000 aeromagnetic data.First,the potential field separation is carried out to obtain anomalous data for gravity and magnetic inversion.Then,under the constraints of surface geology,borehole data and physical properties,the human-computer interaction gravity and magnetic inversion of 19 profiles was completed.Finally,based on the inversion results of these 19 sections,a three-dimensional geological model of the study area was established,and the spatial form of the rock mass and strata at a depth of 3 km underground was obtained.On the basis of analyzing the geophysical and geological characteristics of the main ore deposits in the Qihe-Yucheng ore concentration area,5 new prospecting targe

关 键 词：齐河-禹城 三维地质建模 重磁反演 矽卡岩铁矿 

分 类 号：P631[天文地球—地质矿产勘探]