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地质学报  2009 

川东北地区酸性气体中CO2成因与TSR作用影响

, PP. 1195-1202

Keywords: 川东北地区,酸性气体,CO2成因,TSR作用,地球化学

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Abstract:

通过对川东北地区52个天然气样品化学组分和稳定碳同位素分析,天然气以烃类气体为主,且甲烷占绝对高含量,重烃气体甚微,干燥系数C1/C1+为0.989~1.0。非烃气体H2S和CO2含量变化较大,当二者含量大于5.0%时,具有较好的正相关性。川东北地区天然气中CO2主要包括碳酸盐岩热分解和TSR作用,其中碳酸盐岩热分解生成的CO2含量一般小于5.0%,?13CCO2值小于-2‰,且CO2含量与?13CCO2值具有正相关性;而TSR作用生成的CO2含量大于5.0%,?13CCO2值多大于-2‰,且CO2含量与?13CCO2值具有较弱的负相关性。CH4/CO2比值和(H2S+CO2)/(H2S+CO2+∑C1-3)比值能够较好地反映TSR作用程度;当CH4/CO2比值和(H2S+CO2)/(H2S+CO2+∑C1-3)比值分别小于10和大于0.1时,随着TSR作用增强,CH4/CO2比值减少,而(H2S+CO2)/(H2S+CO2+∑C1-3)比值呈指数增加。同时,遭受TSR作用改造的天然气具有较高CO2含量和重的?13CCO2,造成?13CCO2值与实验结果不一致性的可能原因是在TSR反应过程中部分CO2与硫酸盐中Mg2+、Fe2+和Ca2+等金属离子以碳酸盐的形式沉淀且残余的重碳同位素组成的CO2与酸性气体腐蚀碳酸盐储层形成的CO2相混合。

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