层序地层格架下烃源岩地球化学研究:以尼日尔Termit盆地为例

李美俊; 赖洪飞; 毛凤军; 刘计国; 肖洪; 唐友军

doi:10.3799/dqkx.2018.223

Volume 43 Issue 10

Oct. 2018

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Article Navigation > Earth Science > 2018 > 43(10): 3603-3615

Li Meijun, Lai Hongfei, Mao Fengjun, Liu Jiguo, Xiao Hong, Tang Youjun, 2018. Geochemical Assessment of Source Rock within a Stratigraphic Geochemical Framework: Taking Termit Basin (Niger) as an Example. Earth Science, 43(10): 3603-3615. doi: 10.3799/dqkx.2018.223

Citation:

Li Meijun, Lai Hongfei, Mao Fengjun, Liu Jiguo, Xiao Hong, Tang Youjun, 2018. Geochemical Assessment of Source Rock within a Stratigraphic Geochemical Framework: Taking Termit Basin (Niger) as an Example. Earth Science, 43(10): 3603-3615. doi: 10.3799/dqkx.2018.223

Citation:

Li Meijun, Lai Hongfei, Mao Fengjun, Liu Jiguo, Xiao Hong, Tang Youjun, 2018. Geochemical Assessment of Source Rock within a Stratigraphic Geochemical Framework: Taking Termit Basin (Niger) as an Example. Earth Science, 43(10): 3603-3615. doi: 10.3799/dqkx.2018.223

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Geochemical Assessment of Source Rock within a Stratigraphic Geochemical Framework: Taking Termit Basin (Niger) as an Example

doi: 10.3799/dqkx.2018.223

1.
Key Laboratory of Exploration Technologies for Oil and Gas Resources, Ministry of Education, College of Resources and Environment, Yangtze University, Wuhan 430100, China
2.
State Key Laboratory of Petroleum Resources and Prospecting, College of Geosciences, China University of Petroleum, Beijing 102249, China
3.
Research Institute of Petroleum Exploration and Development, PetroChina, Beijing 100083, China

Received Date: 2018-04-02
Publish Date: 2018-10-20

Abstract

Abstract

How to improve the accuracy of source rock evaluation and prediction based on limited source rock samples data and geological data is a key problem that needs to be solved in the study of source rock geochemistry.By using sequence stratigraphy and petroleum organic geochemistry, this paper studies the spatial distribution and geochemical nature of source rocks of Upper Cretaceous Yogou Formation in the Termit Basin, Niger. This case study preliminarily exhibits the method, application and advantages of geochemical sequence stratigraphy. The main source beds in the Termit Basin are the marine mudstones of the Upper Cretaceous Yogou Formation, which can be divided into three third-order sequences, namely, YSQ1, YSQ2 and YSQ3 from the bottom to the top. Five types of source rocks with different sedimentary facies were subdivided on the basis of sequence/systems tracts, lithology and loggings, which include the lower offshore, upper offshore mudstones, delta and shoreface mudstones, coal seams/carbonaceous mudstones. Different sequences and systems tracts have different vertical and areal distribution patterns of these five source rock types. The organic matters from different source rocks have distinctly different geochemical characteristics. Lower and upper offshore mudstones have fair to good hydrocarbon generative potential with more contribution of lower aquatic organisms, depositing in relatively reducing environment. While delta and shoreface mudstones have good to excellent organic carbon abundances with organic matter input of both lower aquatic organisms and terrestrial organic matter, which deposited in oxidizing environment. The occurrence and lateral distribution of different types of source rocks are evidently controlled by the sedimentary facies distribution and evolution within the third-order sequences or systems tracts, and the same type of source rocks has similar geochemical characteristics. Compared with conventional source rock geochemical assessment, geochemical sequence stratigraphy can provide a practical framework to describe the detailed geochemical characteristics of different sequences, systems tracts and depositional facies within a formation or a member, and subsequently improve the accuracy of hydrocarbon resources assessment and oil-source correlation.
- source rock assessment,
- sequence stratigraphic framework,
- geochemical characteristics,
- Termit Basin,
- Central-West Africa Rift System,
- petroleum geology

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Geochemical Assessment of Source Rock within a Stratigraphic Geochemical Framework: Taking Termit Basin (Niger) as an Example

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