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近年来松辽盆地南部长岭凹陷断陷层的勘探取得了较大进展,发现了腰英台深层气田、东岭油气田和达尔罕、达北、东英台、前神字井等含气构造。不同地区天然气组分含量存在明显差异,烃类及非烃类气体组分含量与距深大断裂的距离密切相关。通过天然气碳同位素研究发现,形成气藏的气源包括断陷层有机烃类气体和幔源无机二氧化碳或氮气,并且有机成因气的成熟度在不同地区的差异较大。在分析了不同油气田(含气构造)气体组分和碳同位素组成等差异性的基础上,从成藏期和输导体系2个方面探讨了造成气藏差异性的主要原因,指出不同地区烃源岩演化的阶段性决定了不同气藏中天然气成熟度的差异,输导体系的不同决定了不同油气田(含气构造)气体组分的差异。
In recent years, significant progress has been made in the exploration of the fault depression in the Changling Sag in the southern Songliao Basin. Some gas-bearing structures such as the Yaowengtai deep gas field, the Dongling oil and gas field and the Darhan, Darby, Dongyingtai, . There are obvious differences in the contents of natural gas in different regions. The contents of hydrocarbons and non-hydrocarbon gases are closely related to the distance from deep faults. Based on the carbon isotope studies of natural gas, it is found that the gas sources forming gas reservoirs include the organic hydrocarbon gas in the fault zone and mantle-derived inorganic carbon dioxide or nitrogen, and the maturity of organic gas varies greatly in different regions. Based on the analysis of the differences of gas components and carbon isotope composition in different oil and gas fields (gas-bearing structures), the main causes of the differences in gas reservoirs are discussed from two aspects of hydrocarbon accumulation period and transport system. It is pointed out that different hydrocarbon The stage of evolution of the source rock determines the difference of natural gas maturity in different gas reservoirs. The difference of the conducting systems determines the difference of gas components in different oil and gas fields (gas-bearing structures).