天津周良庄地质构造背景和地热成因探讨
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摘要
天津市宝坻区南部周良庄一带赋存较为丰富的地热资源。为查明该区各热储补给来源,地温场是否受断裂构造影响,利用人工地震结合钻探资料进行二次解译,分析该区地质构造背景和热储发育特征,同时在综合分析水化学和同位素等化探方法的基础上,对该区的地热成因进行探讨。查明该区主体构造为一背斜构造,地热属沉积盆地型层状热储,地热流体主要有孔隙型热水系统和基岩裂隙型热水系统2个类型,热储条件好。该区热流体矿化度较低的原因是接近补给区,补给水源来自北部山区大气降水;地热流体在深循环过程中与富氧岩石进行了氧交换,δ18O值存在不同程度的氧漂移。
There is plentiful geothermal resources in Zhouliangzhuang of southern Baodi of Tianjin.In order to identify the geothermal origin and the geothermal field whether affected by fault structures,the authors performed secondary interpretationon using artificial earthquake and drilling data,and analyzed the geological tectonic setting and developing characteristics of geothermal reservoir,and discussed the geothermal origin on the basis of hydrochemistry comprehensive analysis and isotope geochemical exploration.It is concluded that the main structure in this area is an anticline,the geothermal belongs to a sedimentary basin-type layered geothermal reservoir,which has two types with good conditions,including porosity-type and bedrock fractured-type hot water systems.Being close to the supply area is the reason of low salinity in this area,and the water supply comes from atmospheric precipitation in northern mountain area.Geothermal fluid exchanged the oxygen with rich oxygen-bearing rocks in deep-cycle process and δ18O existed with the oxygen shifting in various degrees.
There is plentiful geothermal resources in Zhouliangzhuang of southern Baodi of Tianjin.In order to identify the geothermal origin and the geothermal field whether affected by fault structures,the authors performed secondary interpretationon using artificial earthquake and drilling data,and analyzed the geological tectonic setting and developing characteristics of geothermal reservoir,and discussed the geothermal origin on the basis of hydrochemistry comprehensive analysis and isotope geochemical exploration.It is concluded that the main structure in this area is an anticline,the geothermal belongs to a sedimentary basin-type layered geothermal reservoir,which has two types with good conditions,including porosity-type and bedrock fractured-type hot water systems.Being close to the supply area is the reason of low salinity in this area,and the water supply comes from atmospheric precipitation in northern mountain area.Geothermal fluid exchanged the oxygen with rich oxygen-bearing rocks in deep-cycle process and δ18O existed with the oxygen shifting in various degrees.
引文
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[4]赵苏民,高宝珠,黎雪梅,等.沧东断裂(天津段)特征及导水导热性质分析[J].地质调查与研究,2007,30(2):121-127.ZHAO Su-min,GAO Bao-zhu,LI Xue-mei,et al.Cang-dong fracture(in Tianjin)characteristics and the proper-ties analysis of hydraulic and thermal conductivity[J].Geological Survey and Research,2007,30(2):121-127.
[5]胡燕,高宝珠,靳宝珍,等.天津地热流体水化学分布特征及形成机理[J].地质调查与研究,2007,30(3):213-218.HU Yan,GAO Bao-zhu,JIN Bao-zhen,et al.distribu-tion and formation mechanism of geothermal fluid chemis-try[J].Geological Survey and Research,2007,30(3):213-218.
[6]高宝珠,聂瑞平,黎雪梅,等.环境同位素技术在研究天津地热流体补给和径流中的应用[J].地下水,2009,31(4):1-3.GAO Bao-zhu,NIE Rui-ping,LI Xue-mei,et al.Ap-plication of environmental isotope techniques which tostudy geothermal fluid supply and run off[J].Groundw-ater,2009,31(4):1-3.
[7]天津市地质矿产局.天津市区域地质志[M].北京:地质出版社,1992:194-196.Tianjin Bureau of Geology and Mineral Resources.Tianjinregional geology[M].Beijing:Geological PublishingHouse,1992:194-196.
[8]陈墨香.华北地热[M].北京:科学出版社,1998:89-106.CHEN Mo-xiang.Geothermal of Huabei[M].Beijing:Science Press,1998:89-106.
[9]陈瑞军,李嫄嫄,唐永香,等.天津附近奥陶系地热流体成因与补排分析[J].世界地质,2009,28(4):539-545.CHEN Rui-jun,LI Yuan-yuan,TANG Yong-xiang,et al.Analysis of Ordovician geothermal fluid causes,supplyand drainage near Tianjin[J].Global Geology,2009,8(4):539-545.
[10]李俊峰,林黎,李俊,等.天津市周良庄地热田地热资源普查[R].天津地热勘查开发设计院,2006:63-68.LI Jun-feng,LIN Li,LI Jun,et al.General explorationof geothermal resources in Zhouliangzhuang geothermalfield,Tianjin[R].Tianjin Geothermal Exploration andDevelopment--Designning Institute,2006:63-68.
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