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Geoscience ›› 2020, Vol. 34 ›› Issue (02): 297-308.DOI: 10.19657/j.geoscience.1000-8527.2020.02.09

• Geothermal Resources • Previous Articles     Next Articles

Geothermal Resources Evaluation of Karst Thermal Reservoir in Taiyuan Basin

WANG Tinghao(), WANG Xinwei, ZHANG Xuan, MAO Xiang, WANG Di, WU Minghui   

  1. SINOPEC Star Petroleum Corporation Limited,Beijing 100083, China
  • Received:2019-05-05 Revised:2019-07-20 Online:2020-05-25 Published:2020-05-25

Abstract:

Taiyuan basin is a representative low-moderate temperature geothermal field in China, with well-developed fault structure and abundant geothermal resources. The overall evaluation of geothermal resources in Taiyuan basin is of great significance to its large-scale development and utilization. Based on the structural evolution analysis, seismic and electrical profiles interpretations and the latest well logging interpretations, the basin is divided into eight geothermal fields as evaluation units with the “thermal energy storage method” based on the secondary structural units. Carbonate karst thermal reservoirs of Cambrian-Ordovician in eight evaluation units have been carefully evaluated. The results show that the carbonate karst thermal reservoir in the basin is characterized by stable thermal reservoir and caprock, shallow burial depth, multiple reservoir sections and large reserves. The cap rocks of karst thermal reservoir result in burial depths of 400 to 2,000 m. From top to bottom, six major aquifer sections of Ordovician Fengfeng Formation, Upper Majiagou Formation, Lower Majiagou Formation, Liangjiashan Formation, Cambrian Fengshan Formation and Changshan Formation are deposited successively. The average geothermal gradient is 3.0 to 4.0 ℃/100 m, and the geothermal water temperatures range is 30 to 80 ℃. Based on that and the parameters of geothermal reservoir area, thickness, temperature, porosity, heat capacity and density, the total exploitable geothermal reserves in the geothermal field is calculated to be 13.84×108 GJ, which is equivalent to 4,721.9×104 t of standard coal. Distribution regularity and amount of geothermal resources in the Taiyuan basin is thus preliminarily clarified.

Key words: karst thermal reservoir, geothermal field, geothermal resource, Taiyuan basin

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