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石油实验地质  2017, Vol. 39 Issue (5): 618-624    DOI: 10.11781/sysydz201705618
盆地·油藏 本期目录 | 过刊浏览 |
四川盆地早三叠世多尺度海平面变化旋回及对储层发育的影响
肖娇静, 王龙樟, 陈梅, 陈志斌, 周杰, 陈鹏
中国地质大学 海洋学院, 武汉 430074
Multiple scale fluctuations of the Early Triassic sea level and its influence on reservoirs in the Sichuan Basin
Xiao Jiaojing, Wang Longzhang, Chen Mei, Chen Zhibin, Zhou Jie, Chen Peng
College of Marine Science and Technology, China University of Geosciences, Wuhan, Hubei 430074, China
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摘要: 四川盆地东北部鸡唱峭壁剖面发育了下三叠统碳酸盐鲕粒浅滩层序。为揭示该层序形成过程中的海平面变化,进行了一系列同位素和元素地球化学分析。C和O同位素变化反映了高频的海平面变化,可用于地层层序的划分。δ13C增加和δ18O的减少,表明海平面的上升,发育退积准层序组;δ13C的减少和δ18O的增多表明海平面下降,发育进积准层序组。样品采自飞一段至飞二段,这两段共识别了5个准层序组,即pss1-pss5。整个研究层段共划分了5个五级海平面变化旋回及2个四级海平面变化旋回。Sr和Mn含量变化反映了低频的海平面变化,也可用于背景分析以及验证样品是否保持原始沉积成岩环境。Sr同位素的上升趋势,与全球海平面的上升同步;Mn的含量与古水深有关,常富集于深水区,表现为Mn的含量在离岸深水区较岸边浅水区高。Sr、Mn含量的变化揭示了长期的海平面变化趋势。
关键词 碳氧同位素海平面变化层序早三叠世四川盆地    
Abstract:Multiple scale sequences of carbonate oolitic bank developed in Jichang profile of the northeastern Sichuan Basin in the Early Triassic. Several isotopic and elemental proxies were used to reveal the sea-level fluctuation when those sequences formed. The changes of carbon and oxygen isotopes, which are coincident with the high frequency sea level fluctuation, could be used for stratigraphic sequence division. δ13C increasing and δ18O decreasing are used as the proxies of sea level rising, showed in regressive parasequence sets. δ13C decreasing and δ18O increasing are used as the proxies of sea level falling, detected from trangressive parasequence sets. Five parasequence sets, named as pss1-pss5, were distinguished from the first and second members of the Feixianguan Formation from where we sampled. 5 fifth order cycles of sea level fluctuation were recognized and grouped into 2 forth order cycles of sea level fluctuation. The Sr and Mn contents indicate the low frequency fluctuation of sea level, indicating the background of sedimentary and diagenetic environment. The increasing contents of Sr isotope are coincide with the long-term fluctuation of global sea level. Mn contents are related to water depth, enriching in deep water and poor in shallow littoral water. The Sr, Mn content changes indicate the long-term trend of the sea level fluctuation.
Key wordscarbon and oxygen isotopes    sea level fluctuation    sequence stratigraphy    Early Triassic    Sichuan Basin
收稿日期: 2017-03-14     
ZTFLH:  TE122.2  
基金资助:中国石油化工股份有限公司基础攻关项目“川东北碳酸盐岩沉积相及储层建模研究”及“川东北台缘沉积建模及地震沉积学研究”。
通讯作者: 王龙樟(1965—),男,博士,教授,从事石油地质与海洋地质研究.E-mail:longz_wang@cug.edu.cn.     E-mail: longz_wang@cug.edu.cn
作者简介: 肖娇静(1993—),女,硕士研究生,从事海洋地质与资源研究.E-mail:13098805730@163.com.
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肖娇静, 王龙樟, 陈梅, 陈志斌, 周杰, 陈鹏. 四川盆地早三叠世多尺度海平面变化旋回及对储层发育的影响[J]. 石油实验地质, 2017, 39(5): 618-624.
Xiao Jiaojing, Wang Longzhang, Chen Mei, Chen Zhibin, Zhou Jie, Chen Peng. Multiple scale fluctuations of the Early Triassic sea level and its influence on reservoirs in the Sichuan Basin. PETROLEUM GEOLOGY & EXPERIMENT, 2017, 39(5): 618-624.

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http://www.sysydz.net/CN/10.11781/sysydz201705618      或      http://www.sysydz.net/CN/Y2017/V39/I5/618

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