南黄海盆地碳酸盐岩碳氧同位素特征及意义

郑仰帝; 蔡进功

doi:10.11781/sysydz201303307

南黄海盆地碳酸盐岩碳氧同位素特征及意义

doi: 10.11781/sysydz201303307

郑仰帝,
蔡进功^,

同济大学海洋地质国家重点实验室, 上海 200092

基金项目: 中国自然科学基金(41072089);国家油气重大专项(2011ZX05023-003-003)资助.

详细信息

作者简介:
郑仰帝(1987- ),男,硕士研究生,石油地质学专业.E-mail:zhengyangdi1987@126.com.

通讯作者:
蔡进功(1961- ),男,教授,博士生导师,海洋沉积学和石油地质学专业.E-mail:jgcai@tongji.edu.cn.

中图分类号: TE122.1⁺13
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出版历程
- 收稿日期: 2012-08-03
- 修回日期: 2013-04-17
- 刊出日期: 2013-05-28

Characteristics of carbon and oxygen isotopes of carbonate rocks in South Yellow Sea Basin and their implication

Zheng Yangdi,
Cai Jingong^,

State Key Laboratory of Marine Geology, Tongji University, Shanghai 200092, China

摘要

摘要: 对南黄海盆地碳酸盐岩烃源岩(P₁q-T₁q)进行了碳氧同位素测定及孢粉相等分析,研究海相碳酸盐岩有效烃源岩的形成和控制因素.通过对样品δ¹³C与δ¹⁸O相关性等的分析,发现碳氧同位素组成基本保留了原始海洋的同位素组成.栖霞组δ¹³C相对青龙组偏重,预示着较高的生物生产力,更有利于烃源岩的发育.栖霞组δ¹³C以均值为基准可以划分为3个演化阶段,并与孢粉相的变化相对应,表明不同层段烃源岩发育具有差异性.WX5-ST1井青龙组δ¹³C_PDB(均值3.83‰)明显比CZ24-1-1井(均值-1.34‰)的偏重,并与高无定形孢粉相相对应,表明同一层段不同区域烃源岩形成也具有差异性.对比碳氧同位素和孢粉相资料,发现生物生产力与保存条件有效的匹配是烃源岩发育的有利层段.
- 生物生产力 /
- 保存条件 /
- 孢粉相 /
- 碳氧同位素 /
- 烃源岩 /
- 碳酸盐岩 /
- 南黄海盆地
Abstract: Based on the analyses of carbon and oxygen isotope composition and palynofacies of carbonate source rocks (P₁q-T₁q) from the South Yellow Sea Basin,the formation and controlling factors of effective source rocks of marine facies were studied.The correlation between δ¹³C and δ¹⁸O indicated that the carbon and oxygen carbon isotope compositions were similar to those in original ocean.The δ¹³C_PDB values in P₁q were heavier than those in T₁q,indicating for higher biological productivity,which was favorable for source rock generation.Based on mean value,the δ¹³C_PDB values of P₁q were divided into 3 evolution stages corresponding to the changes of palynofacies,indicating that the formation of source rocks varied among different layers.The δ¹³C_PDB values in P₁q from well WX5-ST1 were 3.83‰ in average,obviously heavier than those from well CZ24-1-1 (-1.34‰ in average).It corresponded to the high content of amorphous organic matter,and proved the differences of source rock formation among different regions in the same layer.The comparison of carbon and oxygen isotopes and palynofacies showed that the effective matching of biological productivity and preservation condition was favorable for source rock formation.
- biological productivity /
- preservation condition /
- palynofacies /
- carbon and oxygen isotopes /
- source rock /
- carbonate rock /
- South Yellow Sea Basin

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