塔里木盆地塔东2井寒武系稠油地球化学特征与成藏  

Geochemical Characteristics and Reservoir Formation of Cambrian Heavy Oil of Well Tadong 2 in Tarim Basin

作　　者：唐友军[1,2] 

机构地区：[1]长江大学油气资源与勘探技术教育部重点实验室地球化学系,湖北荆州434023 [2]中国石油大学(北京)资源与信息学院,北京102249

出　　处：《沉积学报》2009年第6期1208-1215,共8页Acta Sedimentologica Sinica

基　　金：国家自然基金项目"原油中含氮化合物分布特征与油藏储层连通性研究"(项目批准号:40773039);山东省高校沉积成矿作用与沉积矿产重点实验室(山东科技大学)资助项目(编号DMSM200806)联合资助

摘　　要：剖析塔东2井稠油的地球化学特征与形成过程,对深化塔里木盆地海相原油的成藏特征具有重要的意义。综合运用碳同位素、色谱、色谱—质谱等技术手段研究了塔东2井寒武系稠油的特征,研究结果揭示塔东2井寒武系稠油具高伽马蜡烷、高C28甾烷、低重排甾烷和高C27-三芳甾烷的特征,与寒武系—下奥陶统烃源岩的分子特征类似,说明塔东2井寒武系原油源自寒武系—下奥陶统烃源岩;塔东2井稠油中检出高丰度的稠环化合物(荧蒽、芘、苯并[a]蒽、屈、苯并荧蒽、苯并芘),及全油的碳同位素值明显偏重,揭示了原油烃类经热蚀变发生稠化;流体包裹体均一化温度和埋藏—热演化史分析确定了塔东2井原油的成藏期为450～440 Ma。Studying the geochemical characteristics and formation history of heavy oil from Well Tadong 2 is of great importance to clarify the oil accumulation of Tarim marine crude oil. The writer synthetically apply the isotope mass spectrogram, chromatogram and chromatogram-mass spectrogram methods to the research of molecular fossil characteristic of heavy oil from Well Tadong 2 gammacerane , high C28 sterane , low , and results reveal that heavy oil from Well Tadong 2 is characterized by high rearranged sterane and high C27-triaromatic steroid, these characteristics are similar to that of Cambrian-Lower Ordovician source rock , which demonstrate that Cambrian crude oil come from Cambrian-Lower Ordovician source rock ; condensed compounds （fluoranthene, pyrene, benzo[a] anthracene, bow, benzo fluoranthene, benzopyrene） with high abundance are detected in the heavy oil of Well Tadong 2, and carbon i- sotope value of whole oil evidently lean to heavier, all foregoing characteristics revealing that hydrocarbons in crude oil become densifieation by thermal alteration. Homogenization temperature of fluid inclusion and burial-thermal evolution history imply that accumulation period of heavy oil from Well Tadong 2 may be at 450-440 Ma.

关 键 词：油—岩对比 热蚀变 生物标志物组合 生烃史 稠油 塔里木盆地 

分 类 号：P593[天文地球—地球化学]