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地球学报  2006 

新疆库车坳陷晚白垩世沉积的地球化学特征及意义

DOI: 10.3975/cagsb.2006.02.05

Keywords: 库车坳陷,晚白垩世,地球化学特征,海侵

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Abstract:

库车坳陷广泛发育的晚白垩世巴什基奇克组是新疆塔里木盆地北部地区克拉苏大型气田的主要储层,其沉积环境一直存在争议。本文依据塔里木盆地北部地区库车坳陷巴什基奇克组地球化学资料,对塔北地区晚白垩世时期发育海侵沉积进行了分析。结合野外露头剖面和钻井剖面巴什基奇克组上段新发现的大量海相钙质超微化石和沉积相特点,认为塔北地区晚白垩世时期曾发生明显的海侵作用,海水分布范围向东可达库车河地区,但沉积环境比较闭塞,古盐度指数反映水介质为咸水,古气候以干旱高温为特点。这一研究为塔西南地区和塔北地区晚白垩世地层对比奠定了基础,对本区的油气勘探和远景分析具有重要意义。

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