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辽河油田西部凹陷冷东断裂带冷１１８井沙三段上部油藏中原油样品的地球化学分析表明，该油藏原油具降解和未降解的双重特征：①正构烷烃和类异戊二烯烃类的气相色谱分布没有遭受微生物降解的迹象；②饱和烃馏分气相色谱的总体分布显示甾类及五环三萜类相对丰度远高于正异构烷烃；③ＧＣ／ＭＳ检出了相当丰富的２５降藿烷系列。这种降解和未降解的特征处于同一原油样品之中的现象，表明该油藏至少存在两期原油注入的历史：即早期注入油藏的原油遭受到严重的微生物降解作用后，又有未受微生物降解的原油注入该油藏。
The geochemical analysis of the middle crude oil samples in the upper third member of Shasan Member of Well Leng 118 in the western Lengshui fault of western Liaohe Oilfield shows that the crude oil from this reservoir has the characteristics of degradation and non-degradation: ① normal paraffins and isoprenoids Of the gas chromatographic distribution did not show any signs of microbial degradation; (2) The overall distribution of gas chromatogram of saturated hydrocarbon fractions showed that the relative abundance of steroids and pentacyclic triterpenes was much higher than that of n-isoparaffin; (3) GC / MS detected a rather rich Dow hopane series. This phenomenon of degradation and undegradation in the same crude oil sample indicates that there are at least two phases of crude oil injection in the reservoir: crude oil injected into the reservoir was subjected to severe microbial degradation after it was infiltrated, Microbial-degraded crude oil is injected into the reservoir.