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A review on challenges in the assessment of geomechanical rock performance for deep geothermal reservoir development

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  • Tomac, Ingrid
  • Sauter, Martin

Abstract

This review paper summarizes recent advances and challenges in the assessment of rock behavior and performance in deep low-permeability and high-temperature geothermal reservoirs. Geothermal energy systems for electricity production target deep rock between ca. 2km and 5km depth to obtain sufficiently elevated temperatures. Rock permeability enhancement faces many challenges, and therefore the development of Enhanced Geothermal Systems (EGS) still represents a pioneering effort. The potential and advantage of EGS above conventional geothermal reservoirs is its independence of the location that supplies sufficient heat and fluid. Several issues prevent the successful application of EGS technology. First, the effects of non-uniform in-situ stresses and loading history on rock fracturing are not well understood. Second, the role of rock anisotropy, heterogeneity and thermal effects on rock properties in the design of hydraulic fracturing operations is not clear. Third, the reduction of induced seismicity effects raises safety and public acceptance issues. This manuscript formulates outlines for future research directions. Specifically, the recommendations focus on the development of tools for better understanding and mitigating problems, which occur during stimulation of deep geothermal reservoirs.

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  • Tomac, Ingrid & Sauter, Martin, 2018. "A review on challenges in the assessment of geomechanical rock performance for deep geothermal reservoir development," Renewable and Sustainable Energy Reviews, Elsevier, vol. 82(P3), pages 3972-3980.
    • Handle: RePEc:eee:rensus:v:82:y:2018:i:p3:p:3972-3980
    DOI: 10.1016/j.rser.2017.10.076
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    References listed on IDEAS

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    1. Zhao, Yangsheng & Feng, Zijun & Xi, Baoping & Wan, Zhijun & Yang, Dong & Liang, Weiguo, 2015. "Deformation and instability failure of borehole at high temperature and high pressure in Hot Dry Rock exploitation," Renewable Energy, Elsevier, vol. 77(C), pages 159-165.
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    2. Ma, Yuanyuan & Li, Shibin & Zhang, Ligang & Liu, Songze & Liu, Zhaoyi & Li, Hao & Shi, Erxiu & Liu, Xuemei & Liu, Hongliang, 2020. "Analysis on the heat extraction performance of multi-well injection enhanced geothermal system based on leaf-like bifurcated fracture networks," Energy, Elsevier, vol. 213(C).
    3. Liu, Jun & Wang, Fenghao & Cai, Wanlong & Wang, Zhihua & Li, Chun, 2020. "Numerical investigation on the effects of geological parameters and layered subsurface on the thermal performance of medium-deep borehole heat exchanger," Renewable Energy, Elsevier, vol. 149(C), pages 384-399.
    4. Zhou, Zhou & Jin, Yan & Zeng, Yijin & Zhang, Xudong & Zhou, Jian & Zhuang, Li & Xin, Shunyuan, 2020. "Investigation on fracture creation in hot dry rock geothermal formations of China during hydraulic fracturing," Renewable Energy, Elsevier, vol. 153(C), pages 301-313.
    5. Ren, Yaqian & Kong, Yanlong & Pang, Zhonghe & Wang, Jiyang, 2023. "A comprehensive review of tracer tests in enhanced geothermal systems," Renewable and Sustainable Energy Reviews, Elsevier, vol. 182(C).
    6. Cai, Jianchao & Zhang, Zhien & Wei, Wei & Guo, Dongming & Li, Shuai & Zhao, Peiqiang, 2019. "The critical factors for permeability-formation factor relation in reservoir rocks: Pore-throat ratio, tortuosity and connectivity," Energy, Elsevier, vol. 188(C).
    7. Xiangchao Shi & Leiyu Gao & Jie Wu & Cheng Zhu & Shuai Chen & Xiao Zhuo, 2020. "Effects of Cyclic Heating and Water Cooling on the Physical Characteristics of Granite," Energies, MDPI, vol. 13(9), pages 1-18, April.
    8. Xia, Z.H. & Jia, G.S. & Ma, Z.D. & Wang, J.W. & Zhang, Y.P. & Jin, L.W., 2021. "Analysis of economy, thermal efficiency and environmental impact of geothermal heating system based on life cycle assessments," Applied Energy, Elsevier, vol. 303(C).
    9. Xue, Yi & Liu, Shuai & Chai, Junrui & Liu, Jia & Ranjith, P.G. & Cai, Chengzheng & Gao, Feng & Bai, Xue, 2023. "Effect of water-cooling shock on fracture initiation and morphology of high-temperature granite: Application of hydraulic fracturing to enhanced geothermal systems," Applied Energy, Elsevier, vol. 337(C).
    10. Minglu Sun & Xu Zhang & Xingcheng Yuan & Zhongyou Yu & Yao Xiao & Ying Wang & Yunhui Zhang, 2022. "Hydrochemical Characteristics and Genetic Mechanism of Geothermal Springs in the Aba Area, Western Sichuan Province, China," Sustainability, MDPI, vol. 14(19), pages 1-21, October.

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