| Melut盆地富含CO2油气藏的成因及期次 |
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| 引用本文： | 李威,窦立荣,文志刚,张光亚,程顶胜.Melut盆地富含CO2油气藏的成因及期次[J].地球科学,2022,47(4):1459-1469. |
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| 作者姓名： | 李威 窦立荣 文志刚 张光亚 程顶胜 |
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| 作者单位： | 1.中海油研究总院, 北京 100028 |
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| 基金项目： | 国家油气重大专项;中国石油天然气股份有限公司科技专项 |
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| 摘 要： | Palogue油田的发现打开了Melut盆地古近系勘探新方向，证实了北部凹陷为富油气凹陷.Palogue油田具有以下白垩统为主力烃源岩，古近系为主力成藏组合的跨时代运聚风格，幔源CO2气体对油气的聚集和改造具有不可忽略的作用.通过对CO2气体、原油特征、生标特征、包裹体特征进行研究，结合地层埋藏史，分析油气特征及成藏期次.结果表明:Palogue油田具有两期成藏的特征，古近纪中期发生第1期油气成藏事件，随后原油被降解；古近纪晚期-新近纪以来，伴随幔源CO2气体油气发生第2次运移充注事件，且CO2气体对油藏进行了强烈的气洗作用.
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| 关 键 词： | Melut盆地 Palogue油田 成藏过程 蒸发分馏作用 南苏丹 石油地质. |
| 收稿时间： | 2017-07-14 |
Genetic Origin of CO2-Rich Oil Reservoirs and Pool-Forming Period in Melut Basin,Southern Sudan |
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| Li Wei,Dou Lirong,Wen Zhigang,Zhang Guangya,Cheng Dingsheng.Genetic Origin of CO2-Rich Oil Reservoirs and Pool-Forming Period in Melut Basin,Southern Sudan[J].Earth Science-Journal of China University of Geosciences,2022,47(4):1459-1469. |
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| Authors: | Li Wei Dou Lirong Wen Zhigang Zhang Guangya Cheng Dingsheng |
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| 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. |
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