Melut盆地富含CO<sub>2</sub>油气藏的成因及期次

李威; 窦立荣; 文志刚; 张光亚; 程顶胜

doi:10.3799/dqkx.2018.539

Volume 47 Issue 4

Apr. 2022

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Li Wei, Dou Lirong, Wen Zhigang, Zhang Guangya, Cheng Dingsheng, 2022. Genetic Origin of CO2-Rich Oil Reservoirs and Pool-Forming Period in Melut Basin, Southern Sudan. Earth Science, 47(4): 1459-1469. doi: 10.3799/dqkx.2018.539

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Li Wei, Dou Lirong, Wen Zhigang, Zhang Guangya, Cheng Dingsheng, 2022. Genetic Origin of CO₂-Rich Oil Reservoirs and Pool-Forming Period in Melut Basin, Southern Sudan. Earth Science, 47(4): 1459-1469. doi: 10.3799/dqkx.2018.539

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Genetic Origin of CO₂-Rich Oil Reservoirs and Pool-Forming Period in Melut Basin, Southern Sudan

doi: 10.3799/dqkx.2018.539

Li Wei^{1, 2
,
,},
Dou Lirong^{2, 3
,
,},
Wen Zhigang²,
Zhang Guangya³,
Cheng Dingsheng³

1.
CNOOC Research Institute Co. Ltd., Beijing 100028, China
2.
College of Resources and Environment, Key Laboratory of Exploration Technologies for Oil and Gas Resources of the Ministry of Education, Yangtze University, Wuhan 430100, China
3.
Research Institute of Petroleum Exploration & Development, PetroChina, Beijing 100083, China

Received Date: 2017-07-14
Publish Date: 2022-04-25

Abstract

Abstract

The oil discovery in the Paleogene of Palogue oilfield of the Melut basin is a milestone in the potentiality of new exploration play direction, it confirmed that the northern sag is hydrocarbon⁃rich sags. The Lower Cretaceous source rock is the major source rock of Melut basin, the Paleogene is its main seal reservoir assemblage.The formation mechanism and model of oil and gas accumulated were proposed based on the specific tectonic-stratigraphic assemblages and evolution history of the Melut basin. Oil and gas accumulation were influenced by mantle CO₂. Analyzed characteristics of oil and hydrocarbon accumulation were investigated using a suite of burial history, fluid inclusions, CO₂ and crude biomarker characteristics by taking Palogue oil reservoir as an example. The results show that the Palogue oil reservoir has experienced two episodes of hydrocarbon accumulations, the first episodes of the hydrocarbon accumulation happened in the Middle Paleogene, but the crude oil was strongly biodegraded.Since the Late Paleogene to Neogene, the second episodes of hydrocarbon accumulations accompany by mantle CO₂.The oil and gas enter traps to form the anticlina reservoirs, CO₂ under the gravity differentiation has carried on the intense gas washing effect to reservoir.
- Melut basin,
- Palogue oilfield,
- accumulation process,
- evaporative fractionation,
- Southern Sudan,
- petroleum geology.

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References(53)

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Genetic Origin of CO2-Rich Oil Reservoirs and Pool-Forming Period in Melut Basin, Southern Sudan

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Genetic Origin of CO₂-Rich Oil Reservoirs and Pool-Forming Period in Melut Basin, Southern Sudan