天津市蓟县系雾迷山组热储层回灌影响因素分析

Analysis on influencing factors of thermal reservoir recharge in Wumishan Formation of Jixian System in Tianjin

中文关键词: 热储层  回灌  裂隙型  雾迷山组

英文关键词: thermal reservoir  recharge  fracture type  Wumishan Formation

中文摘要:

      2022年天津市蓟县系雾迷山组开采量总量约为 2997.71万 m3，回灌总量约 2544.53万 m3，回灌率为 84.88%。天津市裂隙型地热井回灌，不仅与储层裂隙发育、泥质含量、开采现状相关，同时也受回灌流体 的温度、水化学性质等因素的影响。为了地热资源的可持续开发利用，本文采用试验类比、数据统计、线 性回归等方法，对同一构造单元单一回灌影响因素进行统计学分析。结果表明，裂隙型热储层回灌量主要与热储层裂隙发育程度有关，泥质含量、水化学成分在一定程度上影响热储层回灌能力，主要表征热储层裂隙发育程度以及裂隙物理条件优劣；裂隙型热储层回灌效果随着回灌时间的延续效率降低，主要受 热储层温度场、压力场变化的影响，导致水化学成分和裂隙通道大小变化。研究成果可为研究雾迷山组 热储回灌能力提供理论支持。

英文摘要:

      In 2022, the total extraction volume of the Wumishan Formation in the Jixian System of Tianjin wasapproximately 29.9771 million cubic meters, and the total recharge volume was approximately 25.4453 million cu-bic meters, with a recharge rate of 84.88%. The reinjection of fissure-type geothermal Wells in Tianjin is not onlyrelated to the development of reservoir fractures, the content of sediment and the current mining situation, but alsoaffected by factors such as the temperature and water chemical properties of the reinjection fluid. In order to achieve the sustainable development and utilization of geothermal resources, this paper adopts methods such as experimen-tal analogy, data statistics, and linear regression to conduct statistical analysis on the influencing factors of a singlerecharge in the same structural unit. The results show that the reinjection volume of fissure-type thermal reservoirsis mainly related to the degree of fracture development in thermal reservoirs. The content of mud and the chemicalcomposition of water affect the reinjection capacity of thermal reservoirs to a certain extent, mainly characterizingthe degree of fracture development in thermal reservoirs and the quality of fracture physical conditions. The reinjec-tion effect of fissure thermal reservoirs decreases with the continuation of reinjection time, mainly affected by thechanges in the temperature field and pressure field of the thermal reservoirs, resulting in changes in the chemicalcomposition of water and the size of fissure channels. The research results can provide theoretical support for study-ing the reinjection capacity of thermal storage in the Wumishan Formation.