Isotope geochemical responses and their geological significance of Changxing-Feixianguan Formation carbonates, northeastern Sichuan Basin

被引：0
|
作者：
Dong Q. [1 ,2 ]
Hu Z. [3 ]
Chen S. [1 ,2 ]
Li S. [4 ]
Cai J. [4 ]
Zhu Y. [4 ]
Zhang Y. [5 ]
机构：
[1] School of Geosciences, China University of Petroleum(East China), Qingdao
[2] Key Laboratory of Deep Oil and Gas, China University of Petroleum(East China), Qingdao
[3] Sedimentary Basin Research Center, Yangtze University, Wuhan
[4] Chongqing Gas Branch, Southwest Oil & Gas Field Company, PetroChina, Chongqing
[5] Sino Technology Co., Ltd., Dongying
来源：
Oil and Gas Geology | 2021年 / 42卷 / 06期
关键词：
Carbonate rock; Changxing Formation; Feixianguan Formation; Isotope geochemical characteristic; Northeastern Sichuan Basin; Sichuan Basin;
D O I：
10.11743/ogg20210606
中图分类号：
学科分类号：
摘要：
The carbon and oxygen isotopes are important geochemical indexes for the study of carbonate rocks and have been widely used in revealing global climate changes and sea level fluctuation as well as diagenesis and stratigraphic correlations. This study starts with outcrop observation, thin-section identification and trace element analysis, continues with establishing isotope evolution curves with emphasis on the regional comparative analysis of the geochemical response characteristics of carbon and oxygen isotopes based on analyses of carbon and oxygen isotope compositions of 241 carbonate samples from the Changxing-Feixianguan Formations in northeastern Sichuan Basin, and ends with a discussion on the geological significance of these characteristics. The results show that the carbon isotope evolution curves positively correlate with sea level changes in the Changxing period and correspond well with the system tracts in the sequence. The oxygen isotope composition shows a relatively stable trend during this period. Strong negative drift of carbon and oxygen isotope values occurs near the Permian/Triassic boundary while reaching their lowest values. After entering the Feixianguan period, the carbon isotope value keeps rising with a low-amplitude fluctuation until reaching the maximum value inside the fourth member of Feixianguan Formation. The oxygen isotope composition is stable during the Feixianguan period. It is also suggested that the strong negative drift of carbon and oxygen isotopes at the Permian/Triassic boundary may be closely related to methane release and volcanic eruption events. © 2021, OIL & GAS GEOLOGY Editorial Board. All right reserved.
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页码：1307 / 1320
页数：13
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