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经历了20多年的勘探历程,奈曼凹陷近年来获得工业油流,但关于该区天然气的地球化学特征及成因的研究未见报道,通过对奈1区块的38个天然气样品的组分及碳同位素组成进行分析,并结合地质背景详细剖析了该区烃类气体的地球化学特征及成因。指出该区天然气为有机成因气,天然气热演化程度低,属于低熟—成熟的油型气;烃类气中以甲烷为主,重烃气含量较高,天然气干燥系数低,呈现出明显的湿气特征。结合该区烃类气碳同位素及成熟度特征,认为该区天然气为原油伴生气。该区天然气在纵向上呈现出九下段天然气的δ13C1值、C1/C1-5值i、C4/nC4值和iC5/nC5值明显高于九上段,研究认为该区出现这种现象主要受成熟度的影响所致。
After more than 20 years of exploration, the Naiman Sag acquired industrial oil flow in recent years. However, there is no report on the geochemical characteristics and genesis of natural gas in this area. By analyzing the composition of 38 natural gas samples Carbon isotope composition of the analysis, combined with the geological background of a detailed analysis of the geochemical characteristics of hydrocarbon gases and causes. It is pointed out that the natural gas in this area is organic gas and the thermal evolution of natural gas is low, which belongs to low maturity-mature oil gas. The hydrocarbon gas is mainly methane with high content of heavy hydrocarbon gas and low natural gas drying coefficient, showing obvious Moisture characteristics. Combined with the characteristics of carbon isotope and maturity of hydrocarbon in this area, it is considered that the natural gas in this area is associated gas of crude oil. The natural gas in the area shows the δ13C1 value of natural gas in the lower nine sections in the vertical direction. The C1 / C1-5 values i, C4 / nC4 values and iC5 / nC5 values are significantly higher than those in the upper nine sections. The study finds that this phenomenon occurs mainly due to maturity Due to the impact of.