摘要:
吉林省伊舒盆地地层富水性良好、地热资源丰富,具有良好的地热资源开发利用前景。基于研究区伊舒盆地已有地热地质调查和评价资料,结合相关标准、规范和水化学方法,梳理分析研究区水文地质和地热地质条件,探讨了研究区内地热流体赋存条件、水化学和同位素组成特征,并利用热储岩体参数计算研究区的地热储量。结论表明: 研究区地热流体主要赋存于深层碎屑岩类裂隙孔隙中,形成条件具有较高相似性和一定的同源性,溶解性固体(total dissolved solids, TDS)较高、含氟和偏硅酸的低温碱性地下热水,水化学类型为HCO3--Na+型。氢氧同位素组成表明,研究区地下流体补给以古降水为主,地热流体年龄为27 Ka。地热流体储存水量为4.20×1010 m3,年可开采量为3 446.94×104 m3/a。研究成果可为吉林省后续地热资源管理、开发和利用提供科学依据。
Abstract:
Yishu Basin in Jilin Province has good water-rich strata and rich geothermal resources, indicating good development and utilization prospects. Based on the existing geothermal geological survey and evaluation data of Yishu Basin, the authors in this article combed and analyzed the hydrogeological and geothermal geological conditions of the basin, combined with relevant standards, specifications and hydrochemical methods. Besides, the occurrence conditions, hydrochemistry and isotope composition of geothermal fluids in the basin were also discussed, and the geothermal reserves were estimated using the parameters of thermal storage rock mass. The conclusion shows that the geothermal fluid in Yishu Basin mainly exists in the compressed water of deep clastic rock fissures and pores, and the formation conditions have high similarity and certain homology, which are low-temperature alkaline underground hot water with high total dissolved solids (TDS), fluorine containing, metasilicic acid and chemical type of HCO3--Na+. The composition of hydrogen and oxygen isotopes shows that the supply of underground hot water is mainly ancient precipitation, and the age of the geothermal water is 27 Ka. The geothermal fluid storage volume is 4.20×1010 m3, and the recoverable volume is 3 446.94×104 m3/a. The results of this research could provide scientific basis for the subsequent management, development and utilization of geothermal resources in the area.
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