幔源CO<sub>2</sub>对中非裂谷系油气成藏的影响：以Palogue油田为例

李威; 窦立荣; 文志刚; 程顶胜

doi:10.3799/dqkx.2023.133

Volume 49 Issue 10

Oct. 2024

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Article Navigation > Earth Science > 2024 > 49(10): 3488-3498

Li Wei, Dou Lirong, Wen Zhigang, Cheng Dingsheng, 2024. Effect of Mantle-Derived CO2 on Hydrocarbon Accumulation in Central African Rift System: A Case Study of Palogue Oilfield. Earth Science, 49(10): 3488-3498. doi: 10.3799/dqkx.2023.133

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Li Wei, Dou Lirong, Wen Zhigang, Cheng Dingsheng, 2024. Effect of Mantle-Derived CO₂ on Hydrocarbon Accumulation in Central African Rift System: A Case Study of Palogue Oilfield. Earth Science, 49(10): 3488-3498. doi: 10.3799/dqkx.2023.133

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Effect of Mantle-Derived CO₂ on Hydrocarbon Accumulation in Central African Rift System: A Case Study of Palogue Oilfield

doi: 10.3799/dqkx.2023.133

Li Wei^{1, 2, 3
,
,},
Dou Lirong^{2, 3
,
,},
Wen Zhigang³,
Cheng Dingsheng²

1.
CNOOC Research Institute Co.Ltd., Beijing 100028, China
2.
PetroChina Research Institute of Petroleum Exploration and Development, Beijing 100083, China
3.
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

Received Date: 2022-12-23
Available Online: 2024-11-08
Publish Date: 2024-10-25

Abstract

Abstract

The discovery of Palogue oilfield in Melut Basin has opened a new exploration direction of the Central African Rift Paleogene and confirmed that the northern sag of Melut Basin is rich in oil and gas resources. The Lower Cretaceous source rock is the major source rock of Melut basin, the Palaeogene 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 accumulations were influenced of mantle CO₂. Relationship between CO₂ and hydrocarbon accumulation was investigated using a suite of hydrocarbon generation and expulsion history, tectonic evolution history, fluid inclusions, CO₂ and crude by taking Palogue oil reservoir as an example. The results show that the Late Paleogene-Neogene, the occurrence of the mantle source CO₂ migration tectonic thermal event have an important influence on oil and gas accumulation in Palogue oilfield. Under the action of tectonic-thermal events, the thermal evolution of source rocks rapidly enters the mature stage, and intense hydrocarbon generation and expulsion occurs, CO₂ in supercritical state quickly blends into crude oil. The crude oil saturated with supercritical CO₂ quickly migrated through the reservoir and developed a large number of high-temperature mixed hydrocarbon inclusions, which showed the rapid accumulation event under the abnormal high heat event. After the crude oil full of supercritical CO₂ entered the Palogue trap, CO₂ gas began to separate out from the crude oil layer by layer due to the change of formation temperature and pressure conditions, CO₂ gas carries light components into the upper reservoir for mixing. This results in a series of changes in vertical physical properties.
- Melut basin,
- Palogue oilfield,
- accumulation process,
- evaporative fractionation,
- petroleum geology

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References(57)

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Effect of Mantle-Derived CO2 on Hydrocarbon Accumulation in Central African Rift System: A Case Study of Palogue Oilfield

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Effect of Mantle-Derived CO₂ on Hydrocarbon Accumulation in Central African Rift System: A Case Study of Palogue Oilfield