皖南地区大隆组页岩生物标志化合物特征及其地质意义

丁江辉; 孙金声; 张金川; 杨向同; 石刚; 王如意; 黄波; 李会丽

doi:10.3799/dqkx.2022.140

Volume 48 Issue 1

Jan. 2023

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Article Navigation > Earth Science > 2023 > 48(1): 235-251

Ding Jianghui, Sun Jinsheng, Zhang Jinchuan, Yang Xiangtong, Shi Gang, Wang Ruyi, Huang Bo, Li Huili, 2023. Characteristics and Geological Significance of Biomarker for the Upper Permian Dalong Formation Shale in Southern Anhui Province. Earth Science, 48(1): 235-251. doi: 10.3799/dqkx.2022.140

Citation:

Ding Jianghui, Sun Jinsheng, Zhang Jinchuan, Yang Xiangtong, Shi Gang, Wang Ruyi, Huang Bo, Li Huili, 2023. Characteristics and Geological Significance of Biomarker for the Upper Permian Dalong Formation Shale in Southern Anhui Province. Earth Science, 48(1): 235-251. doi: 10.3799/dqkx.2022.140

Citation:

Ding Jianghui, Sun Jinsheng, Zhang Jinchuan, Yang Xiangtong, Shi Gang, Wang Ruyi, Huang Bo, Li Huili, 2023. Characteristics and Geological Significance of Biomarker for the Upper Permian Dalong Formation Shale in Southern Anhui Province. Earth Science, 48(1): 235-251. doi: 10.3799/dqkx.2022.140

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Characteristics and Geological Significance of Biomarker for the Upper Permian Dalong Formation Shale in Southern Anhui Province

doi: 10.3799/dqkx.2022.140

1.
CNPC Engineering Technology R & D Company Limited, Beijing 102206, China
2.
PetroChina Research Institute of Petroleum Exploration & Development, Beijing 100083, China
3.
School of Energy Resources, China University of Geosciences, Beijing 100083, China
4.
Nanjing Center of China Geological Survey, Nanjing 210061, China

Received Date: 2022-01-23
Available Online: 2023-02-01
Publish Date: 2023-01-25

Abstract

Abstract

In order to elucidate shale characteristics of the Upper Permian Dalong Formation in southern Anhui Province in the Lower Yangtze, a total of 20 shale samples collected from Gangdi-1 Well were analyzed by conducting organic geochemical test, argon ion polishing-scanning electron microscopy (SEM) observation, and mineral composition analysis. Results show that total organic carbon (TOC) content for the Dalong Formation shale in southern Anhui Province is in the range of 1.18%-4.35%. The kerogen type is dominated by type Ⅰ and followed by type Ⅱ₁. The vitrinite reflectance (R_o) is between 1.15% and 1.29%, demonstrating that the Dalong Formation shale is in a mature stage of hydrocarbon generation. Moreover, the Dalong Formation shale extracts display a full range of C₁₁-C₃₅ n-alkanes and acyclic isoprenoids. The chromatograms are characterized by a unimodal distribution of n-alkanes with carbon peak in the range of nC₁₈-nC₂₂ and low quantities of long-chain (nC₂₅₊) n-alkanes. Furthermore, the steranes are dominated by C₂₇, C₂₈, and C₂₉ sterane homologs of regular steranes, with the following relative distributions: C₂₇≈C₂₉>C₂₈ regular steranes, which belongs to the V-shaped distribution, indicating that the organic matters in Dalong Formation black shale are mainly originated from lower aquatic organisms (e.g., bacteria and algae) and followed by higher plants in a local area. This conclusion is also supported by the variations of the δ¹³C values of C₁₃-C₂₆ n-alkanes for the target samples being in the range of 3.0‰-5.6‰ offset, which is slightly higher than the corresponding value (1.6‰) of n-alkanes from a single source. In addition, the cross plot of TOC vs. TS as well as the Pr/Ph ratio and the Pr/nC₁₇-Ph/nC₁₈ diagram indicate that Dalong Formation black shale was mainly formed in a marine anoxic-dysoxic environment, which is beneficial to the preservation of organic matter.
- black shale,
- biomarker,
- organic matter source,
- sedimentary environment,
- Dalong Formation,
- southern Anhui Province,
- petroleum geology

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References(59)

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Characteristics and Geological Significance of Biomarker for the Upper Permian Dalong Formation Shale in Southern Anhui Province

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