Sedimentary environment and oil-bearing characteristics of shale in Cretaceous Qingshankou Formation in Songliao Basin

BAI Xin; CHEN Ruiqian; SHANG Fei; ZHANG Nan

doi:10.11781/sysydz2024051063

Volume 46 Issue 5

Sep. 2024

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BAI Xin, CHEN Ruiqian, SHANG Fei, ZHANG Nan. Sedimentary environment and oil-bearing characteristics of shale in Cretaceous Qingshankou Formation in Songliao Basin[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2024, 46(5): 1063-1074. doi: 10.11781/sysydz2024051063

Citation:

BAI Xin, CHEN Ruiqian, SHANG Fei, ZHANG Nan. Sedimentary environment and oil-bearing characteristics of shale in Cretaceous Qingshankou Formation in Songliao Basin[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2024, 46(5): 1063-1074. doi: 10.11781/sysydz2024051063

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Sedimentary environment and oil-bearing characteristics of shale in Cretaceous Qingshankou Formation in Songliao Basin

doi: 10.11781/sysydz2024051063

BAI Xin^{1, 2
,},
CHEN Ruiqian^{1, 2
,
,},
SHANG Fei³,
ZHANG Nan^{1, 2}

1.
State Key Laboratory of Petroleum Resources and Engineering, China University of Petroleum (Beijing), Beijing 102249, China
2.
College of Geosciences, China University of Petroleum (Beijing), Beijing 102249, China
3.
Research Institute of Petroleum Exploration & Development, Beijing 100083, China

Received Date: 2023-09-14
Rev Recd Date: 2024-07-26
Publish Date: 2024-09-28

Abstract

Abstract

The Upper Cretaceous Qingshankou Formation in the Songliao Basin contains thick, widespread, and organic matter-rich shale layers, offering abundant shale oil resources. Studying the sedimentary environment during shale formation and exploring the oil-bearing characteristics of shale oil enrichment intervals provide a theoretical basis for the prediction of the intervals and sweet spots. Based on previous research, the study compared organic carbon content, pyrolysis data, types of organic macerals, and major and trace elements of samples from two typical wells of different sags, well GY8HC in the Gulong Sag and well ZY1 in the Sanzhao Sag, in the central depression zone of the Songliao Basin. The analysis delved into the differences in oil-bearing characteristics and sedimentary environment of the Qingshankou Formation shales in two different sags, further analyzing the factors influencing these differences. The oil-bearing indicators of shales from the two wells in the Qingshankou Formation of the Songliao Basin showed that the total organic carbon (TOC) content in well ZY1 was significantly higher than that in well GY8HC. However, the free hydrocarbon content (S₁) and oil saturation index (OSI) in well ZY1 were lower than those in well GY8HC. The geochemical environment during shale formation controlled organic matter enrichment. Comparing major and trace elements in samples from both wells, it was found that the climate in well ZY1 was more humid during its sedimentary period, the water body had stronger reducing conditions, and its paleoproductivity and paleo-water depth were significantly higher than those in well GY8HC. These conditions were favorable for the preservation of organic matter, thereby forming a higher organic matter abundance in the shale of well ZY1. In addition, it was found that the organic matter type in well GY8HC is mainly Type Ⅰ, sapropelic kerogen, at a mature to highly mature stage, whereas well ZY1 contains mainly Type Ⅱ₁ kerogen, with less Type Ⅰ, at a low to mature stage. Therefore, the shale in well GY8HC possesses better oil generation potential.
- oil-bearing characteristics,
- sedimentary environment,
- oil generation potential,
- shale,
- Qingshankou Formation,
- Cretaceous,
- Songliao Basin

Author CHEN Ruiqian is a Young Editorial Board Member of this journal. CHEN Ruiqian did not take part in peer review or decision making of this article.
The study was designed by SHANG Fei. The experimental operation was completed by BAI Xin and ZHANG Nan. The manuscript was drafted and revised by BAI Xin and CHEN Ruiqian. All authors have read the last version of the paper and consented to its submission.

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References(46)

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Sedimentary environment and oil-bearing characteristics of shale in Cretaceous Qingshankou Formation in Songliao Basin

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Sedimentary environment and oil-bearing characteristics of shale in Cretaceous Qingshankou Formation in Songliao Basin

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