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柴达木盆地天然气的碳同位素地球化学特征及成因分析

Characteristics of Carbon Isotope and Origin of Natural Gas in Qaidam Basin

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【作者】 赵东升李文厚吴清雅甘贵元杨乾政李元奎郝小梅杨武玲

【Author】 ZHAO Dong-sheng~(1,2) LI Wen-hou~(1) WU Qing-ya~(2) GAN Gui-yuan~(2)YANG Qian-zheng~(2) LI Yuan-kui~(2) HAO Xong-mei~(2) YANG Wu-ling~(2)(1.Geology Department of Northwest University,Xi’an710069;2.Qinghai Oilfield Company,CNPC,Dunhuang,Gansu736202)

【机构】 西北大学地质系中国石油青海油田分公司中国石油青海油田分公司 西安710069中国石油青海油田分公司甘肃敦煌736202西安710069甘肃敦煌736202

【摘要】 依据天然气碳同位素中δ13C1、δ13C2、δ13C3的组成与划分标准,将柴达木盆地天然气划分为煤型气、裂解气、油型气与生物气四种类型,通过对天然气同位素中的1δ3C1、1δ3C2-1δ3C1、δ13C3-1δ3C2值的差异分析以及与对应的烃源岩干酪根碳同位素进行对比分析,探讨了柴达木盆地不同地区天然气的成因以及影响因素,这对于探索柴达木盆地的成气规律以及在不同地区天然气勘探的目标选择都有着现实意义。

【Abstract】 δ13C113C213C313C4ofnatural gas isotopic composition are various in different parts of Qaidam Basin.The averageof them are-23.1‰,-24.1‰,-22.7‰ and-23.6‰ in Sanhu area around;-29.8‰,-24.7‰,-23.1‰ and-22.9‰ in Chaibeiyuan area;-39.2‰,-26.8‰,-23‰ and-23‰ in Chaixi area;-67.8‰,-39.2‰,-32.3‰ and lack ofδ13C4in Sanhu area.δ13C413C313C213C1exist betweencomponent of most naturalgas isotope,and reversionof minor heavy carbon isotopic composition exist.Reginally,δ13C113C213C313C4ofnatural gas isotopic compositiondecrease gradually fromSanhu area around,Chaibeiyuan area and Chaixi area to Sanhu area.δ13C213C1andδ13C313C2 ofnatural gas isotopic composition increase gradually fromSanhu area around,Chaibeiyuan area and Chaixi area to Sanhu area,the averageof them are-0.8‰ and-0.9‰ inSanhu area around,5.1‰ and 1.3‰ in Chaibeiyuan area,14.5‰ and 2.3‰ in Chaixi area,27.9‰ and 12.5‰ in Sanhu area. δ13C413C313C213C1exist betweencomponent of most naturalgas isotope because naturalgas of organic geneses are derived from the similar process of thermodynamic action,and reversionof minor heavy carbon isotopic composition exist because of the mixed action of natural gas from the different derivation or the difference of duration,temperatures and pressuresin developing hydrocarbon process from the same source rock.The difference between δ13C213C1and δ13C313C2in different area depend on duration,temperatures and pressuresof source rock evolution,the higher temperatures and pressuresand the longer duration of source rock evolution,the more uniformδ13C distribution between naturalgas component.In the meantime,bacteria and types of kerogen have an effect on δ13C213C1andδ13C313C2to some extent.The study on carbon isotope geochemical characteristic.can not only divide types of naturalgas and discusstheir geneses in theory,but also guide the exploration of naturalgas.

【关键词】 天然气碳同位素成因柴达木盆地
【Key words】 natural gascarbon isotopegenesisQaidam Basin
  • 【文献出处】 沉积学报 ,Acta Sedimentologica Sinica , 编辑部邮箱 ,2006年01期
  • 【分类号】P618.13;P597
  • 【被引频次】17
  • 【下载频次】590
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