Calculation method and suitability zoning of recoverable geothermal fluid in Guantao Formation of Tianjin City
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摘要:
研究目的 “十四五”是碳达峰的关键期、窗口期，要求着力合理推动能源清洁利用和低碳转型，天津市低碳清洁能源——地热资源丰富，对调整能源结构、节能减排、改善环境有着重要的意义。天津市开展了《天津市矿产资源规划（2021—2025年）》的编制工作。其中为了夯实规划编制基础、摸清地热资源禀赋，设置评价专题对天津市地热资源潜力进行深入研究。
研究方法 专题通过采用热储法、统计分析法和数值模拟法对天津市馆陶组地热资源潜力进行评价和对比。
研究结果 热储法在不考虑回灌及其他约束条件的情况下，馆陶组地热流体可开采量为0.94×108 m3/a；统计分析法在考虑回灌、水位降幅及水位降深的情况下，馆陶组地热流体可开采量为0.28×108 m3/a；数值模拟法在考虑回灌、温度降幅及水位降深的情况下，馆陶组地热流体可开采量为0.296×108 m3/a。
结论 通过对比研究，认为采用统计分析法和数值模拟法计算结果可信度较高，并且利用了基于GIS的层次分析法，将GIS技术和层次分析法相结合，对馆陶组地热资源开发利用潜力进行综合性评价及适宜性分区。
Abstract:This paper is the result of geothermal resources survey engineering.
Objective The "14th Five-Year Plan" is a critical period and a window period for carbon peaking. It requires efforts to promote clean energy utilization and low-carbon transformation rationally. Low-carbon and clean geothermal resources in Tianjin are abundant. It is significant to adjust the energy structure and conservation and improve the environment. Tianjin has carried out the compilation of the "Tianjin Mineral Resources Planning (2021-2025)". Among them, to consolidate the foundation of planning and finding geothermal reserves, an evaluation topic is set up to conduct in-depth research on the potential of geothermal resources in Tianjin.
Methods The special topic evaluates and compares the geothermal resource potential of the Tianjin Guantao Formation by using the thermal storage method, statistical analysis method, and numerical simulation method.
Results It is concluded from the research that the recoverable amount of geothermal fluid in the Guantao Formation is 0.94×108m3/a without considering recharge and other constraints; with statistical analysis method in the case of considering recharge, water level depth, and water level drop, the recoverable amount of geothermal fluid in Guantao Formation is 0.28×108m3/a; numerical simulation method in the case of considering recharge, temperature drop and water level drop, the recoverable amount of geothermal fluid in Guantao Formation is 0.296×108m3/a.
Conclusions Through comparative research, it is believed that the statistical analysis method and numerical simulation method are used to calculate the reliability of the results. The GIS-based AHP is used, and the GIS technology and the AHP are combined to carry out comprehensive evaluation and suitability zoning of geothermal resource development and utilization potential in the Guantao Formation.
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表 1 天津市馆陶组热储参数
Table 1. Thermal storage parameters of the Guantao Formation in the Tianjin
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表 3 各构造单元地热流体储存量及可开采量统计
Table 3. Statistics of geothermal fluid storage capacity and recoverable capacity of each structural unit
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表 5 不同计算原则下的可开采量统计
Table 5. Statistics of the mineable volume under different calculation principles
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表 6 不同计算原则下的可开采量统计
Table 6. Statistics of the mineable volume under different calculation principles
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表 7 不同方法计算年可开采量对比(108 m3/a)
Table 7. Comparison of different methods to calculate the annual mining capacity (108m3/a)
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