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塔里木盆地西部阿克莫木气田天然气为非烃组份含量较高的干气,干燥系数高达99 7%;天然气δ13C1和δ13C2值明显偏重,δ13C1为- 25 2‰~ - 21. 9,δ13C2为-21. 2 ~-20 .2‰,如果按传统的观点该天然气应为过成熟煤成气。但是综合气源对比研究表明阿克莫木气田天然气主要源自石炭系Ⅱ型烃源岩,成藏过程研究表明该气田主要聚集了石炭系烃源岩在Ro为1. 5%~1. 8%之后生成的天然气,具有晚期阶段聚气的特征,这是造成阿克1井天然气组份很“干”、碳同位素很重的主要原因。
The natural gas of the Ackromuqi gas field in western Tarim Basin is a dry gas with a high content of non-hydrocarbon components, with a drying coefficient of 99.7%. The natural gas δ13C1 and δ13C2 values are significantly biased, δ13C1 is -25 2 ‰ ~ -21.9 and δ13C2 is -21. 2 ~ -20 .2 ‰, if the traditional view of the natural gas should be over-mature coal into gas. However, the comprehensive gas source comparison study shows that the natural gas in the Ackromu gas field is mainly derived from Carboniferous type Ⅱ source rocks. The study of hydrocarbon accumulation shows that the Carboniferous source rocks mainly accumulate in 1.5% ~ 1.8% of Ro The natural gas generated after% has the characteristics of late-stage gas accumulation, which is the main reason that the natural gas component of Aike-1 well is “dry” and the carbon isotope is heavy.