塔里木盆地塔东2井寒武系稠油地球化学特征与成藏

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C28甾烷、低重排甾烷和高C27 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。

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

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,and results reveal that heavy oil from Well Tadong 2 is characterized by high gammacerane,high C28 sterane,low rearranged sterane and high...