塔里木盆地寒武系源岩地化特征及与典型海相原油对比

doi:10.11743/ogg20170503

摘要/Abstract

摘要： 对27件塔里木盆地台盆区寒武系烃源岩样品进行地球化学分析及油源对比表明，寒武系烃源岩具有低姥植比、C₂₁三环萜烷/C₂₃三环萜烷比值大于1、升藿烷含量低甚至不含、伽马蜡烷含量高、C₂₈规则甾烷相对含量高、C₂₇三芳甾烷相对含量高、三芳甲藻甾烷含量高及同位素偏重等特征。寒武系烃源岩与典型寒武系、奥陶系原油油岩对比分析表明，寒武系烃源岩与T904和TD2等典型寒武系原油具有良好的亲缘性，而与台盆区大量发现的奥陶系油藏原油并无相关性，从而否定了寒武系烃源岩作为台盆区海相原油主力烃源岩的可能性。此外，塔西北地区柯坪隆起肖尔布拉克、东二沟及苏盖特布拉克等剖面烃源岩样品在生源构成上与台盆区其余寒武系烃源岩有一定差异，其母源有机质可能与奥陶系原油母源有机质具有部分相同的菌藻类构成。

关键词: 三芳甾烷, 油源对比, 烃源岩, 寒武系, 塔里木盆地

Abstract: 27 Cambrian source rock samples collected from the Tarim Basin were analyzed for geochemical characteristics and oil-source correlation studies.Most Cambrian source rock samples show a series features such as low pristane/phytane,C₂₁ tricyclic terpane/C₂₃ tricyclic terpane values,low homohopanes content,high content of gammacerane,high relative content of C₂₈ regular steranes and C₂₇ triaromatic steroids,high content of triaromatic dinosteroids and heavier stable carbon isotopic values.The oil-source rock analysis between typical Cambrian and Ordovician oils reveals that Cambrian source rocks have a high degree of similarity with Cambrian oils and are different from those Ordovician oils.So that the Cambrian source rocks are believed not to be the major source rocks of Ordovician reservoirs.Besides,source rocks from Xiaoerbulakr,Dongergou and Sugaitebulake profiles of the Kalpin Uplift show some differences with the rest of Cambrian source rocks on source constitution,which implies partially the same organism compositions with Ordovician oils.

Key words: triaromatic steroid, oil-source rock correlation, source rock, Cambrian, Tarim Basin

中图分类号:

TE122.1

杨福林,云露,王铁冠,等. 塔里木盆地寒武系源岩地化特征及与典型海相原油对比[J]. 石油与天然气地质, 2017, 38(5): 851-861. doi: 10.11743/ogg20170503 Yang Fulin,Yun Lu,Wang Tieguan,et al. Geochemical characteristics of the Cambrian source rocks in the Tarim Basin and oil-source correlation with typical marine crude oil[J]. Oil & Gas Geology, 2017, 38(5): 851-861. doi: 10.11743/ogg20170503

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