Experiments and Analysis of the Hydraulic Fracture Propagation Behaviors of the Granite with Structural Planes in the Gonghe Basin |
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| Authors: | XIE Jingyu LI Lei WEN Dongguang PENG Suping ZHENG Jing FU Guoqiang |
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| Institution: | 1 Center for Hydrogeology and Environmental Geology Survey, China Geological Survey, Tianjin 300309, China
2 State Key Laboratory of Coal Resources and Safe Mining, China University of Mining and Technology, Beijing 100083, China;3 Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring (Central South University), Ministry of Education, Changsha 410083, China
4 School of Geosciences and Info-Physics, Central South University, Changsha 410083, China; 5 School of Resources and Geosciences,China University of Mining and Technology, Xuzhou, Jiangsu 221116, China |
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| Abstract: | Hydraulic fracture (HF) propagation behavior is signi?cant when building enhanced geothermal systems (EGS). HF geometry is closely related to the structural planes (SPs) in hot dry rock (HDR), such as natural fractures (NFs), quartz veins (QVs) and lithologic interfaces (LIs). However, the HF behaviors in HDR have not been well understood, especially the influence of multiple SPs on the HF geometry. To clarify this mechanism, several groups of physical simulation experiments of hydraulic fracturing were conducted to investigate the intersection relationship between the HFs and the SPs. Results show that the HF geometry shows great differences when intersecting with different SPs. In summary, the HF geometry displays four basic patterns, namely, propagation along the SPs, branching, capture, penetration/non-dilation. The fluctuation degree of the pressure-time curve and the HF complexity show a positive correlation. The cementing strength of the SP and their different mechanical properties from rock matrix influence the HF behaviors significantly. Therefore, the HF shows diverse geometries when intersecting with the NFs and LIs, while propagating along the QV when intersecting with it. For the complex networks, it is favorable for the HF to penetrate through and dilate several SPs, rather than simply cross or propagate along the SP. |
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| Keywords: | hot dry rock hydraulic fracture structural planes enhanced geothermal system Gonghe Basin |
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