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Effect of fault distribution on hydraulic fracturing: Insights from the laboratory

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  • Shan, Kun
  • Zhang, Yanjun
  • Zheng, Yanhao
  • Cheng, Yuxiang
  • Yang, Yunxing

Abstract

In geothermal development, induced earthquakes can be problematic side effects. To research the effect of fault distribution on induced earthquakes by hydraulic fracturing, a series of hydraulic fracturing tests were carried out on granite samples. We compared the performance of intact rock and prefabricated fault rock in the process of hydraulic fracturing, and an acoustic emission (AE) system was used to monitor acoustic emission events in the fracturing process. The test results revealed that fracture pressure increases with the increase of injection rate, and the acoustic emission cumulative energy of the prefabricated fault rock sample was higher than that of the intact rock sample. Also, in the process of fracturing, shear fracture accounted for more than 70% of all fractures for the prefabricated fault rock sample. However, for the intact rock sample, shear fracture only accounted for about 50% of all fractures. Our results support the conclusion that the existence of prefabricated faults could lead to an increase in shear fractures and fracture energy.

Suggested Citation

  • Shan, Kun & Zhang, Yanjun & Zheng, Yanhao & Cheng, Yuxiang & Yang, Yunxing, 2021. "Effect of fault distribution on hydraulic fracturing: Insights from the laboratory," Renewable Energy, Elsevier, vol. 163(C), pages 1817-1830.
    • Handle: RePEc:eee:renene:v:163:y:2021:i:c:p:1817-1830
    DOI: 10.1016/j.renene.2020.10.083
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    References listed on IDEAS

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    1. Zhihong Lei & Yanjun Zhang & Zhongjun Hu & Liangzhen Li & Senqi Zhang & Lei Fu & Gaofan Yue, 2019. "Application of Water Fracturing in Geothermal Energy Mining: Insights from Experimental Investigations," Energies, MDPI, vol. 12(11), pages 1-22, June.
    2. Zhang, Yanjun & Ma, Yueqiang & Hu, Zhongjun & Lei, Honglei & Bai, Lin & Lei, Zhihong & Zhang, Qian, 2019. "An experimental investigation into the characteristics of hydraulic fracturing and fracture permeability after hydraulic fracturing in granite," Renewable Energy, Elsevier, vol. 140(C), pages 615-624.
    3. Lei, Zhihong & Zhang, Yanjun & Yu, Ziwang & Hu, Zhongjun & Li, Liangzhen & Zhang, Senqi & Fu, Lei & Zhou, Ling & Xie, Yangyang, 2019. "Exploratory research into the enhanced geothermal system power generation project: The Qiabuqia geothermal field, Northwest China," Renewable Energy, Elsevier, vol. 139(C), pages 52-70.
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