吉木萨尔凹陷芦草沟组致密油地球化学特征及成因

发布时间：2018-06-20 08:47

  本文选题：吉木萨尔凹陷 + 芦草沟组　； 参考：《新疆石油地质》2017年04期

【摘要】：准噶尔盆地吉木萨尔凹陷中二叠统芦草沟组致密油藏原油物性具有"四高"(较高密度、较高黏度、较高凝固点和较高含蜡量)特征,饱和烃色谱研究表明,原油的正构烷烃分布完整,未遭受生物降解作用;轻烃和甾烷成熟度指标反映,原油整体处于低成熟演化阶段,与芦草沟组烃源岩热演化阶段一致,具有近乎一致的地球化学指纹特征,表明二者具有良好的亲缘性,具"源储一体"的致密油藏成藏特征。通过生烃模拟实验发现,芦草沟组烃源岩在低成熟阶段的累计生、排烃量和排油率,相当于正常烃源岩在成熟阶段的生、排烃量和排油率。半深湖—深湖相沉积、咸化的还原—强还原环境以及优良的生烃母质(Ⅰ型—Ⅱ_1型干酪根),是吉木萨尔凹陷芦草沟组优质烃源岩早期大量生烃、排烃和形成低成熟致密油藏的主要原因。
[Abstract]:The physical properties of the dense reservoir of Luchaogou formation in the middle Permian of Jimusar depression, Junggar Basin, are characterized by "four high" (higher density, higher viscosity, higher freezing point and higher wax content). The distribution of normal alkanes in crude oil is intact, and it is not biodegradable. The maturity index of light hydrocarbon and sterane shows that the whole crude oil is in the low mature evolution stage, which is consistent with the thermal evolution stage of source rock of Luchaogou formation. It has almost consistent geochemical fingerprint characteristics, which indicates that both of them have good affinity and have the characteristics of reservoir formation in tight reservoirs with "source and reservoir as a whole". Through the hydrocarbon generation simulation experiments, it is found that the accumulative generation, hydrocarbon expulsion and oil expulsion rate of the source rocks in the low maturity stage of the Luchaogou formation are equivalent to those of the normal source rocks in the mature stage. Half-deep lacustrine-deep lacustrine facies deposition, salinized reduction-strong reduction environment and excellent hydrocarbon source material (type 鈪，

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