Research on 3D geological modeling method and application of urban underground space based on stratigraphic pinchout: A case study of Beihai City, Guangxi

ZHANG Yongwang; PANG Shilong; Hua Weihua; ZHANG Wen; DUAN Jianchao; SU Ziying

doi:10.12097/gbc.2023.03.030

2025 Vol. 44, No. 6

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ZHANG Yongwang, PANG Shilong, Hua Weihua, ZHANG Wen, DUAN Jianchao, SU Ziying. 2025. Research on 3D geological modeling method and application of urban underground space based on stratigraphic pinchout: A case study of Beihai City, Guangxi. Geological Bulletin of China, 44(6): 1174-1186. doi: 10.12097/gbc.2023.03.030

Citation:

ZHANG Yongwang, PANG Shilong, Hua Weihua, ZHANG Wen, DUAN Jianchao, SU Ziying. 2025. Research on 3D geological modeling method and application of urban underground space based on stratigraphic pinchout: A case study of Beihai City, Guangxi. Geological Bulletin of China, 44(6): 1174-1186. doi: 10.12097/gbc.2023.03.030

Research on 3D geological modeling method and application of urban underground space based on stratigraphic pinchout: A case study of Beihai City, Guangxi

1.
Hebei Hydrological Engineering Geological Exploration Institute, Shijiazhuang 050021, Hebei, China
2.
School of Geography and Information Engineering, China University of Geosciences, Wuhan 430070, Hubei, China

Fund Project: Supported by the National Natural Science Foundation of China for the project “Rapid Construction Method of Complex Geological Model under the Joint Influence of Multiple Data” (Grant No. 41972307).

More Information

Author Bio: ZHANG Yongwang, male, born in 1979, senior engineer, mainly engaged in hydrogeological and environmental geological survey and applied research; E-mail: 493959645@qq.com
Corresponding author: PANG Shilong, male, born in 2000, master’s candidate, mainly engaged in the application of AI in underground space and 3D geological modeling research; E-mail: 845190158@qq.com

Received Date: 16 March 2023

Revised Date: 19 October 2023

Publish Date: 15 June 2025

Abstract

Abstract

Objective
The development and utilization of urban underground space constitutes a significant component of contemporary urban construction, with the three dimensional geological model serving as a foundational element in the evaluation of the complexity involved in the development and utilization of underground space. Addressing the challenge of inaccurate stratigraphic zoning in existing three−dimensional geological modelling methods, this paper proposes a rational calculation method for determining the stratigraphic pinch−out location, taking into account the factors that influence model accuracy.
Methods
The method determines the pinch−out position by considering formation thickness, borehole spacing, formation burial depth, and single−hole control range. This is achieved by tracking the formation partition, thereby constructing a more accurate formation surface.
Results
This study selected Beihai City as the research area. Utilizing actual geological data from the region, including boreholes and profiles, a unified stratigraphic sequence was first established, and stratigraphic zoning constraints were generated. Subsequently, a refined three-dimensional geological structure model of Beihai City was successfully constructed. The model’s quality was evaluated through borehole data back-substitution and profile comparisons, and a comparative analysis was conducted against traditional modeling methods. This comparison revealed that the model constructed using the proposed method exhibited a higher degree of conformity with actual borehole-revealed conditions in key areas, and the stratigraphic contact relationships were more reasonably represented.
Conclusions
The proposed method for calculating stratigraphic pinch-out locations based on influencing factors effectively enhances the accuracy of three-dimensional geological models, particularly demonstrating a significant advantage when dealing with complex geological structures involving features such as pinch-outs and unconformable contacts. Compared to traditional modeling approaches, the model developed with this method aligns more closely with actual geological conditions. It offers a novel and more reliable solution for addressing challenges in three-dimensional geological modeling under complex geological settings, and holds important reference value for the refined development and utilization of urban underground space.
- urban underground space /
- 3D geological modeling /
- unified stratigraphic sequence /
- stratigraphic pinchout /
- stratigraphic division /
- model quality evaluation /
- urban geological survey engineering /
- Guangxi

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