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针对塔里木盆地东部英南2凝析气藏不同产层中气体组分和甲烷、乙烷碳同位素分析,探讨了天然气运移成藏过程中,由于地色层作用,组分发生的分馏现象,表现在甲烷相对重烃、异构丁烷相对正构丁烷优先运移,逸散出去的轻烃(甲烷)在上覆盖层砂岩致密性发育过程中逐渐被细菌利用,使天然气组分逐渐贫化甲烷;随深度变浅天然气的δ13C1和δ13C2值变重,上述地化参数示踪了盖层致密性发育过程中天然气组分的分异现象。
In view of the gas composition and the carbon isotope compositions of methane and ethane in the different production zones of the Yingnan 2 condensate gas reservoir in the eastern Tarim Basin, the fractionation phenomenon of the components due to the action of the earth color layer during gas migration and accumulation was discussed. The results show that methane is relatively heavy and isobutane is preferentially transported relative to n-butane. Light hydrocarbon (methane) escaping from the isoparaffin is gradually utilized by bacteria during the development of the overburden sandstone, resulting in gradual depletion of natural gas components As the δ13C1 and δ13C2 values of natural gas became heavier with decreasing depth, the above geochemical parameters traced the differentiation of natural gas components during the development of tight cap rocks.