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通过统计分析准噶尔盆地南缘155个天然气样品组分和碳同位素数据,发现天然气中的N2主要富集在新近系沙湾组、古近系紫泥泉子组和北天山山前的浅部地层中。天然气组分和碳同位素表明,N2和烃类气体为同源生成,均来自有机质处于高—过成熟阶段的侏罗系煤系地层,没有大气渗入和岩浆—火山气体的混入。N2含量与储层年龄和地层埋深有关,随着地层由老到新,埋藏由深至浅,N2逐渐富集。高含氮天然气主要受运移作用控制,是天然气垂向运移的结果,新地层和北天山山前浅部地层中赋存的天然气受到微生物降解。
Through statistical analysis of 155 natural gas sample components and carbon isotope data in the southern margin of the Junggar Basin, it was found that N2 in natural gas is mainly concentrated in the Neogene Shawan Formation, Paleogene Zijinquanzi Formation and shallow piedmont in the North Tianshan Piedmont . The composition of natural gas and carbon isotopes show that N2 and hydrocarbon gases are homogeneously formed, all from the Jurassic coal measures strata that have organic matter in the high-overripe stage, with no infiltration of air and magma-volcanic gases. The N2 content is related to the age of the reservoir and the depth of the formation. As the strata change from old to new and the burial depths to shallow, N2 is gradually enriched. High nitrogen-containing natural gas is mainly controlled by migration and is the result of vertical migration of natural gas. The natural gas in the new formation and the shallow forepart of the North Tianshan Mountains is biodegraded.