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.

引用

页码：1307 / 1320

页数：13

共 40 条

[1] Ma Xinhua, Yang Yu, Wen Long, Et al., Distribution and exploration direction of medium-and large-sized marine carbonate gas fields in Sichuan Basin, SW China, Petroleum Exploration and Development, 46, 1, pp. 1-13, (2019)
[2] Shi Zhensheng, Zhu Xiaomin, Zhang Yaxiong, Et al., Advances and trending topics in sedimentary reservoir research of the Upper Triassic Xujiahe Formation, Sichuan Basin, Oil & Gas Geology, 42, 4, pp. 784-800, (2021)
[3] Qin Zhenchao, Miu Zhiwei, Wei Jianxin, Et al., Seismic physical model of the Maokou Formation reservoirs of platform-margin shoal in Yuanba area, Sichuan Basin, Oil & Gas Geology, 42, 3, pp. 652-660, (2021)
[4] Huang Changbing, Huang Zegui, Wang Xiaofei, Et al., Characte-ristics and main controlling factors of the microbial carbonate reservoirs in the 3rd member of Feixianguan Formation in Puguang Gas Field, Petroleum Geology & Oilfield Development in Daqing, 40, 1, pp. 17-25, (2021)
[5] Zu Kewei, Fan Lingxiao, Wang Bo, Et al., Development patterns of fractures in carbonate reservoirs in the 2nd member of Jialin-gjiang Formation, Puguang area, Sichuan Basin, Oil & Gas Geology, 41, 6, pp. 1188-1196, (2020)
[6] Liu Jingdong, Liu Guangxiang, Wei Qingliang, Et al., Pore evolution characteristics of beach facies reservoir of Feixianguan II Member in Yuanba area, Sichuan Basin, Journal of China University of Petroleum(Edition of Natural Science), 40, 1, pp. 10-17, (2016)
[7] Wei Guoqi, Yang Wei, Liu Mancang, Et al., Characteristics and distribution of platform-margin reef-shoal reservoirs in Changxing-Feixianguan Formations to the west of ocean trough, E'xi-Chengkou area, Oil & Gas Geology, 42, 3, pp. 661-672, (2021)
[8] Ma Yongsheng, Cai Xunyu, Li Guoxiong, Basic characteristics and concentration of the Puguang Gas Field in the Sichuan Basin, Acta Geologica Sinica, 79, 6, pp. 858-865, (2005)
[9] Dong Qingmin, The isotope geochemical response characteristics and significance of carbonate rocks in Changxing-Feixianguan Formation of northeastern Sichuan Basin, (2019)
[10] Shao Hongmei, Lu Xi, Gao Bo, Et al., Geochemical analyzing technique of the microzone's normal position and its application: A case study on the diagenetic evolution of the carbonate reservoir in Gucheng area, Petroleum Geology & Oilfield Development in Daqing, 38, 5, pp. 160-168, (2019)

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