| 天然裂缝影响下的花岗岩水力裂缝扩展数值模拟 |
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| 引用本文： | 王璜,王贵玲,岳高凡,甘浩男.天然裂缝影响下的花岗岩水力裂缝扩展数值模拟[J].地质学报,2020,94(7):2124-2130. |
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| 作者姓名： | 王璜 王贵玲 岳高凡 甘浩男 |
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| 作者单位： | 1) 中国地质大学（武汉）,武汉,430074; 2) 中国地质调查局,北京,100037;3) 中国地质科学院水文地质环境地质研究所，石家庄，050060;4) 自然资源部地热与干热岩勘查开发技术创新中心,石家庄,050060 |
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| 基金项目： | 本文为国家重点研发计划项目（编号2018YFB1501800）和国家自然科学基金青年基金项目（编号41807208）共同资助成果。 |
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| 摘 要： | 水力压裂技术是成功实现干热岩资源开发利用的重要手段之一，数值模拟技术能够精准预测水力裂缝扩展。针对典型花岗岩，借助黏性单元法，分别模拟了致密花岗岩和天然裂缝存在情况下的水力裂缝扩展特征，得出以下结论：致密花岗岩的水力裂缝形态单一，天然裂缝的存在增加了压裂后裂缝的复杂性；致密花岗岩水力裂缝拓展主要分为憋压和拓展两个交替往复的阶段，当存在天然裂隙时，水力压裂过程会变得复杂；天然裂缝存在时，水力裂缝的缝长和缝宽分别为致密花岗岩的5. 7倍和1. 7倍；缝网的形成需要借助复杂的压裂工艺实现。研究结果可以为增强型地热系统(EGS)储层水力刺激工作提供理论支持。
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| 关 键 词： | 干热岩 花岗岩水力压裂 黏性单元模型 天然裂缝 数值模拟 |
| 收稿时间： | 2020/4/23 0:00:00 |
| 修稿时间： | 2020/5/13 0:00:00 |
Numerical simulation of granite hydraulic fracture propagation under the influence of natural fractures |
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| WANG Huang,WANG Guiling,YUE Gaofan,GAN Haonan.Numerical simulation of granite hydraulic fracture propagation under the influence of natural fractures[J].Acta Geologica Sinica,2020,94(7):2124-2130. |
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| Authors: | WANG Huang WANG Guiling YUE Gaofan GAN Haonan |
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| Affiliation: | 1) China University of Geosciences, Wuhan, 430074; 2) China Geological Survey, Beijing, 100037;3) Institute of Hydrogeology and Environmental Geology, Chinese Academy of Geological Sciences, Shijiazhuang, 050060;4) Technology Innovation Center of Geothermal & Hot Dry Rock Exploration and Development,Ministry of Natural Resources, Shijiazhuang, 050060 |
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| Abstract: | Hydraulic fracturing technology is one of the most important technical means to successfully realize the exploitation and utilization of HDR resources. Numerical simulations can accurately predict hydraulic fracture propagation. Cohesive- zone- model was used to simulate the hydrofracture propagation characteristics of dense granite, and granite with natural fractures. The hydraulic fracture of dense granite is a simple crack. The existence of natural fractures increases the complexity of hydro- fractures. The hydrofracture development of tight granite can be divided into two phases: compression and expansion. Hydraulic fracturing can be complicated when natural fractures exist, and the length and width of hydraulic fractures are respectively 5. 7 and 1. 7 times those in dense granite. The formation of a complex fracture network needs special fracturing technology. These research results can provide theoretical support for hydraulic stimulation of an EGS reservoir. |
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| Keywords: | enhanced geothermal systems granite hydraulic fracturing cohesive- zone- model natural fractures numerical simulation |
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