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油藏中原油的成分经常是非均质性的，这种现象在低渗透油田更为明显。它可起因于原油的充注效应和运移过程，亦可源于原油在油藏中的次生化学变化。准噶尔盆地Ｍ油田为一低渗透油田，原油分布特征的研究表明，随着原油密度由东向西增加，原油芳烃馏分的成熟度参数以及与成熟度有关的三芳甾烷浓度等均表现为较好的协同变化关系。芳烃馏分和中性含氮化合物运移参数的分布表明，该油藏原油是自东而西注入的。
The composition of crude oil in reservoirs is often heterogeneous, which is more evident in low permeability oilfields. It can be attributed to the filling effect and migration of crude oil, but also to the secondary chemical changes of crude oil in the reservoir. M oil field in Junggar Basin is a low-permeability oilfield. The study on distribution characteristics of crude oil shows that the maturity parameters of aromatic hydrocarbon fractions of crude oil and the concentration of triarylstannane related to maturity are better as the density of crude oil increases from east to west Collaborative relationship. The distribution of transport parameters for aromatic fractions and neutral nitrogen compounds indicates that the reservoir crude oil is injected from the east to the west.