微量元素在混源油类型划分及油源对比中的应用

发布时间：2018-11-13 06:59

【摘要】：采用微量元素分析三叠系百口泉组和二叠系原油及烃源岩抽提物样品,利用V、Ni、Co、Mo等微量元素含量及其比值将准噶尔盆地玛湖凹陷原油划分为三类单源油(A1、A2、B)和两类混源油(C1、C2),分析烃源岩抽提物微量元素分布特征,建立混源油微量元素识别图版。结果表明:原油中普遍富集V、Cr、Ni、Cu、Mo等过渡金属元素,稀土元素(REE)含量则普遍较低;V/Ni、Co/Ni、Cr/Mo(元素含量比值)等可以作为油源对比的有效指标,A1类原油来源于风城组碳酸盐岩源岩,A2类来源于风城组泥岩类,B类则主要来源于乌尔禾组源岩,C1类为A1及B类混源,C2类为A2及B类混源;该划分方法进一步证明微量元素可以作为复杂高熟条件下原油类型划分及油源对比的有效工具。
[Abstract]:The trace elements were used to analyze the samples of Triassic Baikouquan formation and Permian crude oil and their source rock extracts. The crude oil in Mahu sag of Junggar Basin was divided into three types of single source oil (A _ (1) A _ (2). B) and two kinds of mixed source oil (C _ 1C _ 2), the trace element distribution characteristics of hydrocarbon source rock extracts are analyzed, and the trace element identification chart of mixed source oil is established. The results show that the transition metal elements such as V _ (Cr) Cr ~ (2 +) Ni (Cu) Mo and so on are generally enriched in crude oil, while the (REE) content of rare earth elements is generally low. V / NiCoP / NiCr-Mo (element content ratio) can be used as an effective indicator for oil source correlation. Type A1 crude oil is derived from carbonate source rock of Fengcheng formation, while A2 type comes from mudstone of Fengcheng formation. B is mainly derived from the source rocks of Wuerhe formation, C1 is mixed with A1 and B, C2 with A2 and B; The method further proves that trace elements can be used as an effective tool for classification of crude oil types and oil source correlation under complex high maturity conditions.
【作者单位】：中国石油大学油气资源与探测国家重点实验室;中国石油勘探开发研究院;中国石油新疆油田分公司实验检测研究院;中国石化石油勘探开发研究院;
【基金】：国家科技重大专项(2017ZX05001-004) 中国石油新疆油田分公司课题(2014-C4023)
【分类号】：P618.13

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