晋中盆地文水县南峪口一带地热水离子比值及同位素特征研究
|
摘要
山西晋中盆地属山西地堑带,蕴藏有巨大的地热资源。采用钻探手段在文水县南峪口一带施工地热勘探井一眼,揭露奥陶系中统热储层(O_2)和奥陶系下统及寒武系热储层(O_1+∈)热储层,并采取水样进行测试。通过离子比值分析,推断地热水主要来源为原生海水沉积,同时在滞流条件下,与围岩进行离子交换,经过漫长的地质演化过程后,形成了具有独特水化学特征的地下水。通过对氘(D)、氧-18(~(18)O)、氚(T)同位素特征的分析,推断大气降水对深部岩溶水的补给交换作用极其微弱,为径流时间久的深循环水;通过对硫-34(~(34)S)的分析,表现出地热水溶解围岩石膏矿物的特征;通过对碳-14(~(14)C)的分析,反映地热水年龄较老,热储环境封闭,较完整地保留了沉积水原始的同位素组分。
Shanxi Jinzhong Basin belongs to the Shanxi mantle belt and contains huge geothermal resources. Drilling tools were used to construct a geothermal exploration well in the Nantunkou area of Wenshui County, exposing the Ordovician middle-class thermal reservoir(O_2) and the Ordovician lower and Cambrian thermal reservoirs(O_1+∈) thermal reservoirs. And take a water sample for testing. Through the ion ratio analysis, it is concluded that the main source of geothermal water is the primary seawater sedimentation, and under the stagnation condition, the ion exchange with the surrounding rock, after a long geological evolution process, the formation of groundwater with unique water chemistry characteristics. By analyzing the isotope characteristics of strontium(D), oxygen-18(~(18)O) and strontium(T), it is concluded that the atmospheric precipitation has a very weak recharge effect on deep karst water, which is a deep cycle water with long runoff time; The analysis of 34(~(34)S) shows the characteristics of geothermal water dissolved in rocky minerals; through the analysis of carbon-14(~(14)C), it reflects that the geothermal water is older and the thermal storage environment is closed, and the sediment is more completely preserved. The original isotope component of water.
Shanxi Jinzhong Basin belongs to the Shanxi mantle belt and contains huge geothermal resources. Drilling tools were used to construct a geothermal exploration well in the Nantunkou area of Wenshui County, exposing the Ordovician middle-class thermal reservoir(O_2) and the Ordovician lower and Cambrian thermal reservoirs(O_1+∈) thermal reservoirs. And take a water sample for testing. Through the ion ratio analysis, it is concluded that the main source of geothermal water is the primary seawater sedimentation, and under the stagnation condition, the ion exchange with the surrounding rock, after a long geological evolution process, the formation of groundwater with unique water chemistry characteristics. By analyzing the isotope characteristics of strontium(D), oxygen-18(~(18)O) and strontium(T), it is concluded that the atmospheric precipitation has a very weak recharge effect on deep karst water, which is a deep cycle water with long runoff time; The analysis of 34(~(34)S) shows the characteristics of geothermal water dissolved in rocky minerals; through the analysis of carbon-14(~(14)C), it reflects that the geothermal water is older and the thermal storage environment is closed, and the sediment is more completely preserved. The original isotope component of water.
引文
[1]王恒纯.同位素水文地质概论[M].北京:地质出版社.1991.
[2]张新军,刘鸿福,张和生,等.山西断陷盆地榆次经纬厂一带地热水勘查及同位素地球化学特征[J].工程地球物理学报.2011(1):105-109.
[3]侯新伟,李向全,陈浩.汾河中游干流河水与大气降水和浅层地下水的转化关系[J].水文地质工程地质.2008(06):44-47+55.
[4]贾振兴,臧红飞,郑秀清,等.太原地区大气降雨的氢氧同位素特征研究[J].水资源与水工程学报.2015(2).
[5]吴晓静.谈运用稳定同位素法查寻地下水污染源[J].大众科技.2006(3):114-114.
[6]洪业汤,张鸿斌,朱咏煊,等.中国大气降水的硫同位素组成特征[J].自然科学进展:国家重点实验室通讯.1994(6):741-745.
[7]张江华,梁永平,王维泰,等.硫同位素技术在北方岩溶水资源调查中的应用实例[J].中国岩溶.2009.28(3):235-241.
[2]张新军,刘鸿福,张和生,等.山西断陷盆地榆次经纬厂一带地热水勘查及同位素地球化学特征[J].工程地球物理学报.2011(1):105-109.
[3]侯新伟,李向全,陈浩.汾河中游干流河水与大气降水和浅层地下水的转化关系[J].水文地质工程地质.2008(06):44-47+55.
[4]贾振兴,臧红飞,郑秀清,等.太原地区大气降雨的氢氧同位素特征研究[J].水资源与水工程学报.2015(2).
[5]吴晓静.谈运用稳定同位素法查寻地下水污染源[J].大众科技.2006(3):114-114.
[6]洪业汤,张鸿斌,朱咏煊,等.中国大气降水的硫同位素组成特征[J].自然科学进展:国家重点实验室通讯.1994(6):741-745.
[7]张江华,梁永平,王维泰,等.硫同位素技术在北方岩溶水资源调查中的应用实例[J].中国岩溶.2009.28(3):235-241.