Effect of water flowing fracture on the evaluation of geothermal resources under the doublet well system for geothermal extracting

ZhuTing WANG, ShengBiao HU, YiBo WANG, KeSong ZHANG, HongJie XU, YiZuo SHI, GuangZheng JIANG, Chao ZHANG

Prog Geophy ›› 2025, Vol. 40 ›› Issue (1) : 70-79.

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Prog Geophy ›› 2025, Vol. 40 ›› Issue (1) : 70-79. DOI: 10.6038/pg2025II0035

Effect of water flowing fracture on the evaluation of geothermal resources under the doublet well system for geothermal extracting

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Abstract

The geothermal doublet system which one well is designed for the extraction and the other is for recharge has been widely applied for geothermal extracting while in the dynamic evaluation for the hydrothermal geothermal resources. However, the neglect of the existence of the water flowing fracture can cause the inaccurate assessment for the geothermal resources in the thermal reservoir. In this study, combined the knowledge of the geology which mainly includes the rock stratum and geological structure, geothermics geology mainly including the temperature field and rock thermophysical parameters, and hydrogeology and based on the hydro-thermal coupling numerical simulation, the effect of water flowing fracture on the assessment of geothermal resources was studied detailedly by using the doublet well system, thus, the results of numerical simulation calculations will be more closer to the actual geological situation. This research mainly analyzed the temperature distribution characteristics within the thermal reservoir under the different extraction times, and the changing tendency of production temperature and the energy production rate of the production well from the thermal reservoir with time was also analyzed carefully under the conditions which the water flowing fracture was perpendicular or parallel to the plane (the plane was defined by the production and rejection wells), and after that the above simulation calculation results are compared with the case that no water flowing fracture was existed in the thermal reservoir. On the other hand, effect of different physical properties of the water flowing fracture mainly including the rock permeability, rock porosity and thickness of the fracture on the simulation calculation was also analyzed in this research. The results of this study can make the evaluation of geothermal resources more reflecting the actually geological conditions which is conducive for the subsequent development and utilization planning, and at the same time can provide a reference case for other study areas.

Key words

Hydrothermal geothermal resources / Geothermal doublet system / Assessment of geothermal resources / Water flowing fracture / Physical properties of rock

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ZhuTing WANG , ShengBiao HU , YiBo WANG , et al . Effect of water flowing fracture on the evaluation of geothermal resources under the doublet well system for geothermal extracting[J]. Progress in Geophysics. 2025, 40(1): 70-79 https://doi.org/10.6038/pg2025II0035

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