基于先验信息约束的重磁电联合三维交互反演技术实践--以彭山穹隆构造为例

三维地质建模是实现深部矿产勘查突破的重要途径,其通过控矿地质体的三维建模,直观刻画控矿要素之间的空间、成因和演化关系,帮助理解成矿系统,开展深部找矿预测。当前三维建模主要采用地质资料构建,在缺少钻孔等已知资料的情况下,难于构建出可靠的三维地质模型。为了克服常规三维地质建模方法可信度低、精度差的缺点,本文将重磁电交互反演技术引入到三维地质建模中,提出了基于先验信息约束,通过重磁二度半剖面交互反演、电法反演、三维物性反演联合修正的三维地质模型方法。本文采用该方法建立了彭山穹隆的三维地质模型,并在此基础上对彭山穹隆的成因进行了讨论。

3D gravity magnetic and electrical inversion modeling based on prior information:A case study of the dome structure in Pengshan area,Jiangxi Province

Three-dimensional geological modeling is an important way to realize the background of deep mineral exploration.Based on three-dimensional modeling of ore-controlling geological bodies,this method can directly describe the spatial,genetic and evolutionary relationship between the ore controlling factors.At present,the 3D modeling mainly uses geological data,but in the absence of drilling and other known information,it is difficult to construct a reliable 3D geological model.In order to overcome the disadvantages of poor accuracy and low reliability of conventional 3D geological modeling,the authors put forward an effective method based on the prior information.In this approach,a series of sections obtained by the 2.5D interactive inversion and electrical inversion,combined with the sections of 3D physical property inversion,are employed to correct the process of building a 3D geological model.With this method,the 3D geological model of the dome structure in Pengshan area has been successfully established.On this basis,the cause of the formation of the Pengshan dome structure is discussed.