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Open AccessArticle

Three-Dimensional Regularized Focusing Migration: A Case Study from the Yucheng Mining Area, Shandong, China

1
College of Geo-Exploration Sciences and Technology, Jilin University, Changchun 130000, China
2
China Aero Geophysical Survey and Remote Sensing Center for Land and Resources, Beijing 100083, China
*
Authors to whom correspondence should be addressed.
Minerals 2020, 10(5), 471; https://doi.org/10.3390/min10050471
Received: 23 March 2020 / Revised: 17 May 2020 / Accepted: 21 May 2020 / Published: 22 May 2020
(This article belongs to the Special Issue Geophysics for Mineral Exploration)
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. View Full-Text
Keywords: 3D focusing migration; regularization; conjugate migration direction; fast imaging; skarn-type iron deposits 3D focusing migration; regularization; conjugate migration direction; fast imaging; skarn-type iron deposits
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MDPI and ACS Style

Ding, Y.; Ma, G.; Xiong, S.; Wang, H. Three-Dimensional Regularized Focusing Migration: A Case Study from the Yucheng Mining Area, Shandong, China. Minerals 2020, 10, 471.

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