Numerical Modeling of Natural Fracture Distributions in Shale |
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| Authors: | LI Yaping CHEN Xiaowei SHAO Yongbo |
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| Institution: | 1 School of Mechatronic Engineering, Southwest Petroleum University, Chengdu 610500, China;2 State Key Laboratory of Explosion Science and Technology, Beijing Institute of Technology, Beijing 100081, China; 3 School of Civil Engineering and Geomatics, Southwest Petroleum University, Chengdu 610500, China |
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| Abstract: | The production efficiency of shale gas is affected by the interaction between hydraulic and natural fractures. This study presents a simulation of natural fractures in shale reservoirs, based on a discrete fracture network (DFN) method for hydraulic fracturing engineering. Fracture properties of the model are calculated from core fracture data, according to statistical mathematical analysis. The calculation results make full use of the quantitative information of core fracture orientation, density, opening and length, which constitute the direct and extensive data of mining engineering. The reliability and applicability of the model are analyzed with regard to model size and density, a calculation method for dominant size and density being proposed. Then, finite element analysis is applied to a hydraulic fracturing numerical simulation of a shale fractured reservoir in southeastern Chongqing. The hydraulic pressure distribution, fracture propagation, acoustic emission information and in situ stress changes during fracturing are analyzed. The results show the application of fracture statistics in fracture modeling and the influence of fracture distribution on hydraulic fracturing engineering. The present analysis may provide a reference for shale gas exploitation. |
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| Keywords: | shale core natural fracture discrete fracture network (DFN) hydraulic fracturing |
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