| 塔里木盆地古城地区下奥陶统碳酸盐岩碳氧同位素特征 |
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| 引用本文： | 张振伟, 丁寒生, 张亚金. 塔里木盆地古城地区下奥陶统碳酸盐岩碳氧同位素特征[J]. 海洋地质与第四纪地质, 2016, 36(2): 59-64. doi: 10.16562/j.cnki.0256-1492.2016.02.007 |
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| 作者姓名： | 张振伟 丁寒生 张亚金 |
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| 作者单位： | 大庆油田有限责任公司勘探开发研究院, 大庆 163712 |
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| 摘 要： | 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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| 关 键 词： | 碳酸盐岩 碳、氧同位素 海平面变化 古城地区 下奥陶统 |
| 收稿时间： | 2015-07-22 |
| 修稿时间： | 2015-09-20 |
CARBON AND OXYGEN STABLE ISOTOPE FEATURES OF THE LOWER ORDOVICIAN IN GUCHENG REGION OF TARIM BASIN |
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| ZHANG Zhenwei, DING Hansheng, ZHANG Yajin. CARBON AND OXYGEN STABLE ISOTOPE FEATURES OF THE LOWER ORDOVICIAN IN GUCHENG REGION OF TARIM BASIN[J]. Marine Geology & Quaternary Geology, 2016, 36(2): 59-64. doi: 10.16562/j.cnki.0256-1492.2016.02.007 |
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| Authors: | ZHANG Zhenwei DING Hansheng ZHANG Yajin |
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| Affiliation: | Exploration and Development Science Research Institute of Daqing Oilfiled Company Ltd., Daqing 163712 |
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| Abstract: | The Lower Ordovician carbonate reservoirs in the Gucheng region of the Tarim Basin are mainly gas plays. 51carbonate rock samples collected from the Well GC7, 8, 9 and 12 are analyzed for carbon and stable oxygen isotopes. The results demonstrate that the δ13C fluctuates from -2.26‰ to 1.55‰(PDB), and the δ18O from -10.57‰ to -4.69‰(PDB). The Mn/Sr is less than 2 or 3. It suggests that the original ratios of C and O isotopes are well preserved. As δ13CPDB values have positive correlation with sea-levels, the results indicate a regression period in Early Ordovician. |
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| Keywords: | Lower Ordovician carbonate rocks carbon and oxygen stable isotope sea-level changes Gucheng region |
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