川东北地区石炭系与二叠系—三叠系天然气地球化学特征对比研究  

Comparison of Geochemical Characteristics of Carboniferous and Permian-Triassic Natural Gas in Northeast Shichuan

作　　者：陈践发[1] 唐友军[1] 徐立恒[1] 李玲[1] 马广宇[1] 赵兴齐[1] 

机构地区：[1]中国石油大学(北京)油气资源与探测国家重点实验室,北京102249

出　　处：《天然气地球科学》2008年第6期741-747,共7页Natural Gas Geoscience

基　　金：国家自然科学基金项目(编号:40773039);国家"973"项目(编号:2006CB202307)联合资助

摘　　要：川东北地区石炭系黄龙组与二叠系长兴组—三叠系飞仙关组气藏的天然气地球化学特征对比研究表明,该区天然气总体为高—过成熟的干气,C2+含量普遍较低,其中二叠系长兴组—三叠系飞仙关组气藏的天然气相对石炭系黄龙组的天然气更加偏干。川东北地区二叠系长兴组—三叠系飞仙关组的天然气中非烃气体含量相对明显偏高,分布范围介于0.1%～77.8%之间,以高含H2S和CO2为特点,而石炭系黄龙组天然气中非烃气体含量较低,其H2S的含量分布范围在0.01%～4.8%之间,绝大部分天然气的H2S含量在0.5%以下。川东北地区石炭系黄龙组与二叠系长兴组—三叠系飞仙关组气藏的天然气重烃(C4—C12)分布特征也具有明显差异。川东北地区二叠系长兴组—三叠系飞仙关组的天然气CH4、C2H6的碳同位素组成相对石炭系黄龙组天然气偏重;二叠系长兴组—三叠系飞仙关组的天然气CH4、C2H6的碳同位素组成大部分为正序分布,而石炭系黄龙组的天然气CH4、C2H6的碳同位素组成基本为反序分布。This paper studies the geochemical characteristics of natural gas in Carboniferous Huanglong Formation and Permian Chanxing Formation-Triassic Feixianguang Formation in the area of Northeast Sichuan. The results show that the natural gas belongs to high-mature dry gas, C2^＋ content is low,and the natural gas in Permian Chanxing Formation-Triassic Feixianguang Formation is drier than that in Carboniferous Huanglong Formation. The content of non-hydrocarbon gas of Permian Chanxing Formation-Triassic Feixianguang Formation is relatively high ranging 0.1% -77.8% and characterized by high H2 S and CO2 contents, but the non-hydrocarbon gas of Carboniferous Huanglong Formation is relatively low and the H2S content is 0.01%-4.8%, most below 0.5 %. The distributing characteristics of heavy hydrocarbons （C4- C12） are also obviously different. The carbon stable isotope compositions of CH4 and C2 H6 in Permian Chanxing Formation-Triassic Feixianguang Formation are heavier than in Carboniferous Huanglong Formation, and they are distributed positively in Permian Chanxing Formation-Triassic Feixianguang Formation and reversely in Carboniferous Huanglong Formation.

关 键 词：地球化学特征 非烃气体 重烃 CH4和C2H4 碳同位素组成 

分 类 号：TE122.114[石油与天然气工程—油气勘探]