Hydrogeochemical characteristics of deep geothermal fluids in the Binhai New Area, Tianjin City
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摘要: 通过近几年滨海新区深部热储的勘探开发,对古近系东营组和蓟县系雾迷山组的认识也逐步加深。从水化学特征、热储温度、水文地球化学作用方面对东营组和雾迷山组地热流体展开分析,为进一步开发利用深部热储地热资源提供了依据。宁河凸起雾迷山组补给较为充分,东营组赋存环境较封闭,东营组地热流体属于“平衡水“;地热温标计算出的雾迷山组热储平均温度约126℃,东营组热储平均温度100 ℃,两者均源自大气降水,东营组地热流体与岩石交换时间更长些,循环能力更弱,深部地热流体径流方向自NE向SW向,径流过程主要发生了溶滤作用、阳离子交换、沉淀作用及混合作用。Abstract: The understanding of the Paleogene Dongying formation and the Jixianian Wumishan formation have been gradually deepened with the exploration and development of deep thermal reservoirs in the Binhai New Area.This paper analyzes the hydrochemical characteristics, reservoir temperature, and hydrogeochemical effects of the geothermal fluid of the Dongying and Wumishan formations, thus providing bases for the further development and utilization of deep geothermal resources. The Wumishan formation in the Ninghe salient is adequately recharged. In contrast,the Dongying formation occursin a relatively closed environment, and the geothermal fluid in it is at a state of chemical equilibrium. The average temperature of the geothermal reservoirs in the Wumishan and Dongying formation scalculated using geothermometers is about 126 ℃ and 100 ℃, respectively. The geothermal fluid in both formations originates from atmospheric precipitation. Compared to the Wumishan formation, the geothermal fluidin the Dongying formation exchanges heat with rocks for a longer time and has a weaker cycling capacity. The runoff direction of the geothermal fluid in the formations is from northeast to southwest, with leaching, cation exchange, precipitation,and mixing mainly occurring during the fluid runoff.
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