塔里木盆地古城地区下奥陶统碳酸盐岩碳氧同位素特征

Marine Geology & Quaternary Geology(2016)

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Abstract
下奥陶统碳酸盐岩储层是塔里木盆地古城地区的主要产气层.为了探讨研究区下奥陶统碳酸盐岩碳同位素变化的原因,对取自塔中地区古城7、古城8、古城9和古城12等4口井的51块碳酸盐岩样品进行了分析,结果显示,δ13C值为-2.26‰~1.55‰,δ18O值为-10.57‰~-4.69‰,Mn/Sr也小于2~3的范围.结果表明,研究区碳酸盐岩样品基本保持了碳氧同位素的原始组成.δ13C值与海平面变化存在正相关关系,证明研究区早奥陶世晚期存在一海退期.
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Key words
Lower Ordovician,carbonate rocks,carbon and oxygen stable isotope,sea-level changes,Gucheng region
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