磁异常及其磁梯度数据自结构约束反演方法及在煤田火烧区勘查的应用  

Method of self-structure-constrained inversion of magnetic anomalies and their magnetic gradients and its application in the exploration of coal burning area

作　　者：马国庆[1] 马生玮 李丽丽[1] 蔡锦 MA GuoQing;MA ShengWei;LI LiLi;CAI Jin(College of Geoexploration Science and Technology of Jilin University,Changchun 130021,China)

机构地区：[1]吉林大学地球探测科学与技术学院,长春130021

出　　处：《地球物理学进展》2024年第3期1026-1037,共12页Progress in Geophysics

基　　金：国家自然科学基金面上项目“航空与地面一体化重力数据协同高分辨率场源位置和密度反演方法研究”(42074147)资助。

摘　　要：随着航磁测量技术的发展,航磁可以开展原始场以及梯度场的测量,梯度场具有更高的分辨率,因此其组合测量得到广泛应用.为了有效提取出地下地质体高分辨率的物性结构,基于磁及磁梯度来获取更高分辨率结果,开发了自结构约束磁及磁梯度协同反演方法,其利用单分量数据的反演结果作为不同参量数据联合反演的结构约束项,从而有效以不同数据的分辨率特征为约束来获得更加准确的结果.此外,基于非结构四面体网格具有良好的地形和非规则地质体的适用性以及分辨率的优势,建立了基于非结构四面体网格的协同反演方法.模型试验表明,非结构四面体网格的协同反演方法对于地下场源恢复的精度更高.并将该方法用于活鸡兔井火烧去边界的刻画,通过两次航磁测量表明,该火烧区依然处于燃烧状态且以约0.5 m/天的速度在水平方向和竖直方向发展.With the development of aeromagnetic measurement technology,aeromagnetic measurement can carry out the measurement of the original field and the gradient field,the gradient field has a higher resolution,so its combination measurement has been widely used.In order to effectively extract high-resolution physical structures of underground geologic bodies and obtain higher resolution results based on magnetic and magnetic gradients,a self-structure-constrained magnetic and magnetic gradient collaborative inversion method is developed,which uses the inversion results of single-component data as the structural constraint term of the joint inversion of data of different parameters.Therefore,the resolution features of different data are effectively used as constraints to obtain more accurate results.In addition,a collaborative inversion method based on unstructured tetrahedral mesh is established based on its advantages of good terrain,applicability of irregular geological bodies and resolution.Model tests show that the unstructured tetrahedral mesh collaborative inversion method has higher accuracy for subsurface field source recovery.Two aeromagnetic measurements show that the burning area is still in a burning state and develops in both horizontal and vertical directions at a rate of about 0.5 m/day.

关 键 词：磁及磁梯度协同反演 非结构网格 自结构约束反演 航磁测量 火烧区 

分 类 号：P631[天文地球—地质矿产勘探]