塔里木盆地寒武系源岩地化特征及与典型海相原油对比

发布时间：2018-04-05 04:27

本文选题：三芳甾烷　切入点：油源对比　出处：《石油与天然气地质》2017年05期

【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、C_(21)三环萜烷/C_(23)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、C_(28)规则甾烷相对含量高、C_(27)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。
[Abstract]:The geochemical analysis and oil source comparison of 27 samples of Cambrian source rocks in the Tai-basin area of Tarim Basin show that the Cambrian source rocks have a lower ratio of tricyclic terpene to tricyclic terpene / C _ (23) trichloroterpene > 1, and a low or even no content of epimedium in Cambrian source rocks.The relative content of regular sterane is high, the relative content of triarosterane is high, the content of triaromarbosterane is high and the isotopic weight is biased.The comparative analysis of Cambrian source rocks with typical Cambrian and Ordovician crude oil rocks shows that Cambrian source rocks have good affinity with typical Cambrian crude oils such as T904 and TD2, but have no correlation with Ordovician oil reservoirs found in large quantities in the Taipan area.Therefore, the possibility of Cambrian source rock as the main source rock of marine crude oil in the platform basin area is denied.In addition, the source rock samples in the Keping uplift, Dongergou and Sugaitburak sections in the northwest of Tarim Basin are different from the other Cambrian source rocks in the platform basin area in terms of source composition.The parent organic matter may have the same composition of bacteria and algae as the original organic matter of Ordovician crude oil.
【作者单位】：铜仁学院;中国石油大学(北京)地球科学学院;中国石化西北油田分公司;
【基金】：国家自然科学基金项目(41272158)
【分类号】：P618.13

【相似文献】