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Geoscience ›› 2023, Vol. 37 ›› Issue (04): 954-962.DOI: 10.19657/j.geoscience.1000-8527.2022.095

• Water Resources and Environmental Geology • Previous Articles     Next Articles

Current Geothermal Field of the South Jiangsu Modernization Demonstrative Area and Its Influencing Factors

YANG Lumei1,2(), KUANG Rongxi1,2, GUO Hui1,2, ZUO Liqiong1,2, GOU Fugang1,2, XU Shugang1,2, ZHANG Shuo1,2   

  1. 1. Geological Survey of Jiangsu Province, Nanjing, Jiangsu 210018, China
    2. Key Laboratory of Earth Fissures Geological Disaster, Ministry of Natural Resources, Nanjing, Jiangsu 210018, China
  • Received:2022-01-24 Revised:2022-12-26 Online:2023-08-10 Published:2023-09-02

Abstract:

The South Jiangsu Modernization Demonstrative Area belongs to the Lower Yangtze region. The study area includes mainly four lower-order structural units: the Northern Jiangsu Depression, the Central Uplift, the Southern Jiangsu Depression, and the Nantong-Taihu Uplift. Distribution characteristics of the local geothermal gradient, the deep ground temperature and the terrestrial heat flow were analyzed based on the temperature data of 39 geothermal wells and previous published data. The results show that the present geothermal gradient ranges from 14.9 to 26.5 ℃/km (average 21.3 ℃/km). The present terrestrial heat flow values range from 51.0 to 73.5 mW/m2 (average 64.2 mW/m2). Factors affecting the present geothermal field were further explored, including geological structure, thermal conductivity, caprock thickness and volcanic body. The depression area has lower geothermal gradient than the uplift area, and the deep ground temperature and the terrestrial heat flow exhibit the same characteristics. Vertically, the geothermal system is characterized by segmentation. Geothermal gradient of the strata with high thermal conductivity is smaller than that of the strata with low thermal conductivity.

Key words: South Jiangsu Modernization Demonstrative Area, current geothermal field, geothermal gradient, terrestrial heat flow, thermal conductivity

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