共和盆地氦气气体同位素特征及氦气富集主控因素  

Lsotopic Characteristics of Helium Gas and Main Controlling Factors of Helium Enrichment in Gonghe basin

作　　者：安生婷 谢菁 陈建洲 晁海德 赵胜楠 薛晟 An Shengting;Xie Jing;Chen Jianzhou;Chao Haide;Zhao Shengnan;Xue Sheng(The Fourth Geological Exploration Institute of Qinghai Province,Xining,Qinghai,810000,China;Qinghai Provincial Key Laboratory of Shale Gas Resources,Xining,Qinghai,810000,China)

机构地区：[1]青海省第四地质勘查院,青海西宁810000 [2]青海省页岩气资源重点实验室,青海西宁810000

出　　处：《新疆地质》2025年第1期131-138,共8页Xinjiang Geology

基　　金：青海省引导地方科技发展资金氦气地球化学特征及地下热岩元素地球化学与矿物相关性气源追索——以共和盆地干热岩、热泉及地下热水为例项目(2021ZY001)资助。

摘　　要：通过采集共和盆地及周边地下温泉和岩石样品,对样品氦气等稀有气体组分及氦同位素进行分析。部分样品氦气含量达工业标准(氦气体积分数大于0.05%)^([1]),其中共和阿乙亥、曲乃亥地区氦含量较高(阿乙亥地区氦平均含量为4789.23×10^(-6)、曲乃亥地区氦含量达8379.09×10^(-6)),兴海地区次之,贵德地区水样中氦含量最少。岩样中氦含量比地下热水中氦含量少,说明该盆地中大部分氦已从源岩中释放并溶于地下热水中。结合共和盆地构造背景,进一步探讨了共和盆地氦气形成的主控因素,氦气主要为壳源氦,影响区内氦气富集的主要因素有大面积富铀、钍花岗岩体可衰变产生氦气、断裂及岩石裂隙可成为氦气的运移通道、良好的地下水循环系统及地热资源可作为氦气运移的良好载体。认为共和盆地具有形成富氦气藏的良好“生-运”条件。This article collected samples of underground hot springs and rocks in the Gonghe Basin and its surrounding areas through the implementation of the local science and technology development fund project"Helium geochemical characteristics and underground hot rock element geochemistry and mineral correlation gas source tracing-taking the Gonghe Basin's dry hot rocks,hot springs,and underground hot water as examples",and analyzed the rare gas components such as helium and helium isotopes in the samples.Some samples have helium content that meets industrial standards(helium volume fraction greater than 0.05%),with higher helium content in the Gonghe Ayihai and Qunaihai areas(average helium content in Ayihai area is 4789.23×10^(-6),and in Qunaihai area it reaches 8379.09×10^(-6)),followed by Xinghai area,and the lowest helium content in water samples in Guide area.The helium content in the rock sample is lower than that in the underground hot water,indicating that most of the helium in the basin has been released from the source rock and dissolved in the underground hot water.Based on the tectonic background of the Gonghe Basin,the main controlling factors for the formation of helium gas in the Gonghe Basin were further explored.The helium gas in this area is mainly crustal helium,and the main factors affecting the enrichment of helium gas in the area include largescale uranium rich and thorium granite bodies that can decay to produce helium gas,developed fractures and rock fissures that can serve as channels for helium gas migration,a good groundwater circulation system,and geothermal resources that can serve as good carriers for helium gas migration.It is believed that the Gonghe Basin has favorable conditions for the formation of rich helium gas reservoirs.

关 键 词：共和盆地 氦气 气体同位素 成因分析 富集因素 

分 类 号：O613.11[理学—无机化学]