冀中地区文安油田原油非均质性及其意义

通过全油GC/MS分析，揭示了冀中地区文安油田分子组成上的非均质性。研究认为，文安油田至少存在两类不同成因类型的原油（Ⅰ类和Ⅱ类）。Ⅰ类原油具有较高的甾/藿比，生物标志化合物（甾烷、伽马蜡烷、4-甲基甾烷）含量相对较高，芳香族化合物（甲基菲、三芳甾烷以及甲基二苯并噻吩）含量相对较低;Ⅱ类原油具有较低的甾/藿比，生物标志化合物含量相对较低，芳香族化合物含量相对较高。两类原油的分布具有规律性:Ⅰ类原油分布于南区的议论堡构造带;Ⅱ类原油分布于北区的史各庄构造带。研究表明，文安油田至少存在两个油气富集体系。

Heterogeneity of crude oil from W en’an oilfield in Jizhong area and its implications

The whole oilGC/MS analysis shows thatmolecular constituents of oil in theWen’an oilfield in the Jizhong area have certain heterogeneity.According to this study，it is believed that at least two genetic types ofoil（TypeⅠand TypeⅡ）occur in theWen’an oilfield.The TypeⅠoil is characterized by relatively high steˉraneˉhopane ratio，relatively higher content of biomarkers（sterane，gammacerane and4ˉmethyl sterane）and reˉlatively lower content of aromatic compounds（methylphenanthrene，triaromatic sterane and methyldibenzothioˉphene）.In contrast，the TypeⅡoil features in lower steraneˉhopane ratio，relatively lower content ofbiomarkers and relatively higher contentof aromatic compounds.The distribution of these two types ofoil shows certain reguˉlarity，with the typeⅠoil occurring in the Yilunpu structural belt in the southern part and the TypeⅡoil disˉtributed in the Shigezhuang structural belt in the northern part.At least two petroleum systems occur in the Wen’an oilfield.