3D Gravity and magnetic modelling and prospecting in Qihe-Yucheng Area,Shandong Provinces
The iron-rich ore area discovered in recent years in the Qihe-Yucheng ore concentration area of Shandong Prov-ince 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 ar-ea 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-control-ling strata have not been effectively solved.Seriously restrict the further expansion of the scale of the deposit.Three-dimen-sional geological modeling technology with gravity and magnetic constraints has become an important means of deep ore pros-pecting.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 inver-sion.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 target areas are predicted based on the characteris-tics of the ore-controlling geological bodies revealed by the three-dimensional geological model.
Qihe-Yucheng3D geological modelgravity and magnetic inversionskarn iron deposit
万方数据
维普
