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Geothermal Characteristics and Productivity Potential of a Super-Thick Shallow Granite-Type Enhanced Geothermal System: A Case Study in Wendeng Geothermal Field, China

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  • Haiyang Jiang

    (Key Laboratory of Groundwater Resources and Environment, Ministry of Education, Jilin University, Changchun 130012, China
    No.1 Institute of Geology and Mineral Resource Exploration of Shandong Province, Jinan 250010, China
    Shandong Engineering Laboratory for High-Grade Iron Ore Exploration and Exploitation, Jinan 250010, China)

  • Liangliang Guo

    (College of Water Resources Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China)

  • Fengxin Kang

    (801 Institute of Hydrogeology and Engineering Geology, Shandong Provincial Bureau of Geology and Mineral Resources (SPBGM), Jinan 250014, China
    College of Earth Science and Engineering, Shandong University of Science and Technology, Qingdao 266590, China
    School of Water Conservancy and Environment, University of Jinan, Jinan 250022, China)

  • Fugang Wang

    (Key Laboratory of Groundwater Resources and Environment, Ministry of Education, Jilin University, Changchun 130012, China)

  • Yanling Cao

    (No.1 Institute of Geology and Mineral Resource Exploration of Shandong Province, Jinan 250010, China
    Shandong Engineering Laboratory for High-Grade Iron Ore Exploration and Exploitation, Jinan 250010, China)

  • Zhe Sun

    (Tianjin Branch, CNOOC China Ltd., Tianjin 300459, China)

  • Meng Shi

    (Shandong No.3 Exploration Institute of Geology and Mineral Resources, Yantai 264000, China)

Abstract

Super-thick shallow granites without a cap layer are widely distributed in the Wendeng geothermal field. To evaluate the field’s productivity potential for an enhanced geothermal system (EGS), we carried out field tests, laboratory tests and numerical simulations in succession. The geothermal characteristics and deep rock mechanical properties were identified based on real geological and core data from the borehole ZK1 in Wendeng geothermal field. Then, a numerical model of reservoir hydraulic fracturing based on a discrete fracture network was established. Thermal extraction simulations were then conducted to assess the long-term productivity of an EGS project based on the fracturing results. Possible well layout patterns and operational parameters were considered. Results indicated that, for naturally fractured formations, large well spacings should be used and reservoirs with overdeveloped natural fractures should not be selected. For the same reservoir, created by stimulation, the production performances of five-spot and triplet-well modes were different. The pressure indicator was more sensitive to the choice of well layout mode than the temperature indicator. The power generation of the five-spot well mode was slightly improved above that of the triplet-well mode. When selecting the target reservoir, the formations with high temperatures, moderate natural fractures, and high in-situ stress shielding are preferable. On this basis, a large volume of fracturing fluids should be injected to stimulate the reservoir, making the reservoir length and width as large as possible. If the desired large-scale reservoir is created, the five-point well mode should be selected.

Suggested Citation

  • Haiyang Jiang & Liangliang Guo & Fengxin Kang & Fugang Wang & Yanling Cao & Zhe Sun & Meng Shi, 2023. "Geothermal Characteristics and Productivity Potential of a Super-Thick Shallow Granite-Type Enhanced Geothermal System: A Case Study in Wendeng Geothermal Field, China," Sustainability, MDPI, vol. 15(4), pages 1-25, February.
    • Handle: RePEc:gam:jsusta:v:15:y:2023:i:4:p:3551-:d:1069010
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    References listed on IDEAS

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    1. Honglei Shi & Guiling Wang & Wei Zhang & Feng Ma & Wenjing Lin & Menglei Ji, 2023. "Predicting the Potential of China’s Geothermal Energy in Industrial Development and Carbon Emission Reduction," Sustainability, MDPI, vol. 15(9), pages 1-16, May.

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