基于三维反演的重力异常分离方法研究

Regional-residual Field Separation of Gravity Data Using Three-dimensional Inversion

为了能够根据目标体的位置直观分离出不同深度的重力局部异常,提出一种基于三维反演的重力位场分离技术。根据重力三维反演的基本原理,给出了利用三维反演技术实现重力异常分离的技术流程。通过理论模型试验,并与理论响应及传统重力解析延拓、趋势分析等算法进行对比,表明不论从区域异常和局部异常的形态还是幅值上本研究结果都优于传统算法。该技术应用于江西九瑞矿集区重力数据异常分离研究中,相对于传统算法局部异常更加接近实际地质情况,可有效提取不同深度的局部异常;同时,结合地质资料对局部异常进行分析和解释,为九瑞深部找矿和区域地质认识提供借鉴和参考。

In order to directly extract the residual gravity anomaly for different target depths,it is presented a novel regional-residual field separation method based on three-dimensional(3D)inversion of gravity data in this paper.It is introduced the theory of 3D inversion of gravity data and presented the technical process of regional-residual field separation.Through theoretical model test and comparison with the theoretical response,traditional gravity analytic continuation,trend analysis and other algorithms,the results of this paper are superior to the traditional algorithms in terms of both the shape and the amplitude of regional anomalies.The method is applied on the gravity survey data from Jiu-rui metallogenic district in Jiangxi Province.Compared with the traditional algorithm,this method would be extracted effectively the local anomalies of given different depths,which is closer to the actual geological conditions.The analysis and the interpretation of the residual gravity anomaly combined with the known geological data helps in mineral exploration and understanding of regional geology in Jiu-rui metallogenic district.