陈永权,张艳秋,周鹏,阿里木·卡德尔

• 1:中国石油塔里木油田分公司

摘要(Abstract)：

塔里木盆地寒武系白云岩是油气勘探的重要领域,由于钻孔取芯较少,且大量白云岩化造成生物化石难以识别与鉴定,导致寒武纪地层的划分与对比问题长期以来存在多解性。通过研究塔里木盆地钻孔苗岭统-芙蓉统开展碳同位素地层学,拟解决寒武系苗岭统的等时对比问题。分析结果显示不同钻孔相同层位同位素漂移表现出一致性特征,塔西台地区沙依里克组底部出现明显的碳同位素负漂移(N1),阿瓦塔格组顶部出现碳同位素负漂移(N2),下丘里塔格组下部见碳同位素负漂移(N3)、中部出现碳同位素正漂移(P1);塔东盆地区突尔沙克塔格组下部出现碳同位素正漂移(P1’),莫合尔山组底部(N1’)、中部(N2’)、上部(N3’)各见一个碳同位素微弱负漂移。在古生物地层框架下,通过与全球对比分析,提出:1)塔西台地区沙依里克组底部碳同位素负漂移N1与全球性Redlichiid-Olenellid Extinction Carbon isotope Excursion(ROECE)可对比, N1底对应寒武系苗岭统底;推测塔东盆地区莫合尔山组底微弱负漂移N1’底对应苗岭统底。2)下丘里塔格组中部、突尔沙克塔格群下部出现的碳同位素正漂移(P1; P1’)与全球性Steptoean Positive Carbon Isotope Excursion (SPICE)可对比, P1与P1’底对应芙蓉统排碧阶。3)塔西台地区苗岭统阿瓦塔格组底部碳同位素负漂移N2、塔东盆地区莫合尔山组中部负漂移N2’可能等时对应Drumian Carbon Isotope Excursion (DICE),代表鼓山阶/乌溜阶的接触界限;塔西台地区下丘里塔格组下部的碳同位素负漂移N3、塔东盆地区莫合尔山组上部的同位素负漂移N3’可能对应古丈阶/鼓山阶界线。

关键词(KeyWords)： 塔里木盆地;寒武系;苗岭统;碳同位素地层

Abstract:

Keywords:

基金项目(Foundation): 国家科技重大专项课题(2016ZX05004-004;2017ZX05008-005)资助

作者(Author): 陈永权,张艳秋,周鹏,阿里木·卡德尔

DOI: 10.19839/j.cnki.dcxzz.2019.03.009

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