Abstract
The construction of fine-scale three-dimensional models of deep structures at a regional scale remains challenging. These models can be significantly benefitted by focusing on the binary lithological architecture (i.e. different lithologies in the hanging wall and the footwall), which exists in several types of structures, such as detachment faults, domes and intrusion contact zones. Along these lines, in this work, a novel approach to the three-dimensional modelling of deep structures was proposed by using the level set method and transforming the geometric construction of deep structures into the lithological distribution interpreted from the gravity data. With this method, first, an initial model was constructed that provides a general model frame. Subsequently, the initial model was optimized to generate a refined model that represents fine-scale features of deep structures. The initial model was established based on the high-density geological data and extrapolation of trends. The refined model was reconstructed from the stepwise addition of the geological–geophysical data to the initial model, including gravity data, seismic profiles and geological knowledge. This was achieved through the parametrization of the initial model as the level set function to convert the data to a series of weighted misfit functions, which were solved by the gradient descent algorithm. In addition, the proposed approach was applied to the modelling of the Zhaoping detachment fault in the Jiaodong Peninsula, Eastern China. Interestingly, the lithologies of the hanging wall and the footwall are Precambrian metamorphic rocks and Mesozoic granite, indicating a binary feature. An initial model and two stepwise refined models were also constructed. From the extracted modelling results, it was demonstrated that the errors of location and morphology of the refined model were 1% and 30%, which were lower than those of the initial model (8% and 100%), demonstrating the effectiveness of the developed refined modelling approach. This work provides a new and powerful three-dimensional modelling approach for geological structures by effectively integrating both geological–geophysical data and knowledge. Owing to the unique flexibility of manipulating surfaces and incorporating data, the proposed modelling approach has the potential to be easily extended to the modelling of other types of deep structures, as well as application to other geophysical data.
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This research was funded by the National Natural Science Foundation of China (Nos. 42030809, 72088101, 41772349, 41972309 and 42072325), the National Key R&D Program of China (No. 2017YFC0601503) and the Natural Science Foundation of Hunan Province, China (No. 2020JJ4749).
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Wang, J., Mao, X., Peng, C. et al. Three-Dimensional Refined Modelling of Deep Structures by Using the Level Set Method: Application to the Zhaoping Detachment Fault, Jiaodong Peninsula, China. Math Geosci 55, 229–262 (2023). https://doi.org/10.1007/s11004-022-10031-z
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DOI: https://doi.org/10.1007/s11004-022-10031-z