塔里木盆地台盆区古生界原油碳同位素组成及油源探讨

发布时间：2018-06-24 07:52

  本文选题：塔里木盆地 + 寒武系　； 参考：《石油勘探与开发》2017年06期

【摘要】：基于塔里木盆地台盆区寒武系—奥陶系烃源岩干酪根样品以及古生界原油样品的碳同位素组成特征,探讨台盆区古生界原油的成因和来源。台盆区寒武系至少发育下寒武统以及中—上寒武统2套碳同位素组成具有明显差异的烃源岩,其中,下寒武统烃源岩干酪根碳同位素组成明显偏轻,中—上寒武统烃源岩干酪根碳同位素组成相对偏重,而奥陶系烃源岩则介于两者之间。台盆区古生界原油的碳同位素组成分布范围较大,其d~(13)C值为-35.2‰~-28.1‰,其中d~(13)C值为-34.0‰左右相对富集轻碳同位素的原油应主要来源于下寒武统烃源岩,d~(13)C值为-29.0‰左右相对富集重碳同位素的原油应主要来源于中—上寒武统烃源岩,碳同位素组成居中的原油不能排除寒武系烃源岩的贡献。分析认为,寒武系烃源岩具有主力烃源岩的条件,台盆区深层油气勘探潜力巨大。
[Abstract]:Based on the carbon isotopic compositions of Cambrian-Ordovician source rock samples and Paleozoic crude oil samples in the Tai-basin area of Tarim Basin, the origin and origin of Paleozoic crude oil in the Tai-basin area are discussed. At least 2 sets of carbon isotopic compositions of Lower Cambrian and Middle-Upper Cambrian have been developed in the Taiwan basin area, in which the kerogen carbon isotopic compositions of the Lower Cambrian source rocks are obviously lighter than those of the lower Cambrian source rocks. The kerogen isotopic compositions of the Middle and Upper Cambrian source rocks are relatively heavy, while the Ordovician source rocks are somewhere between the two. The distribution range of carbon isotopic composition of Paleozoic crude oil in the Taiwan basin area is large, and its d13 C value is -35.2 鈥，

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