Gravity migration is a fast imaging technique based on the migration concept to obtain subsurface density distribution. For higher resolution of migration imaging results, we propose a 3D regularized focusing migration method that implements migration imaging of an entire gravity survey with a focusing stabilizer based on regularization theory. When determining the model parameters, the iterative direction is chosen as the conjugate migration direction, and the step size is selected on the basis of the Wolfe–Powell conditions. The model tests demonstrate that the proposed method can improve the resolution and precision of imaging results, especially for blocky structures. At the same time, the method has high computational efficiency, which allows rapid imaging for large-scale gravity data. It also has high stability in noisy conditions. The developed novel method is applied to interpret gravity data collected from the skarn-type iron deposits in Yucheng, Shandong province. Migration results show that the depth of the buried iron ore in this area is 750–1500 m, which is consistent with the drilling data. We also provide recommendations for further mineral exploration in the survey area. This method can be used to complete rapid global imaging of large mining areas and it provides important technical support for exploration of deep, concealed deposits.

中文翻译：

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三维正则化集中式移民-以山东禹城矿区为例

重力迁移是一种基于迁移概念的快速成像技术，用于获取地下密度分布。为了获得更高分辨率的偏移成像结果，我们提出了一种3D正则化聚焦偏移方法，该方法基于正则化理论使用聚焦稳定器来实现整个重力测量的偏移成像。在确定模型参数时，选择迭代方向作为共轭迁移方向，并根据Wolfe-Powell条件选择步长。模型测试表明，该方法可以提高成像结果的分辨率和精度，特别是对于块状结构。同时，该方法具有很高的计算效率，可以对大型重力数据进行快速成像。在嘈杂的条件下也具有很高的稳定性。将该方法应用于山东禹城矽卡岩型铁矿床重力数据的解释。迁移结果表明，该区域埋藏铁矿石的深度为750-1500 m，与钻探数据一致。我们还为在调查区域内进行进一步的矿物勘探提供了建议。该方法可用于完成大型矿区的快速全球成像，并为深部隐蔽矿床的勘探提供重要的技术支持。我们还为在调查区域内进行进一步的矿物勘探提供了建议。该方法可用于完成大型矿区的快速全球成像，并为深部隐蔽矿床的勘探提供重要的技术支持。我们还为在调查区域内进行进一步的矿物勘探提供了建议。该方法可用于完成大型矿区的快速全球成像，并为深部隐蔽矿床的勘探提供重要的技术支持。