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

被引：0
|
作者：
Li W. [1 ,2 ]
Dou L. [2 ,3 ]
Wen Z. [2 ]
Zhang G. [3 ]
Cheng D. [3 ]
机构：
[1] CNOOC Research Institute Co. Ltd., Beijing
[2] College of Resources and Environment, Key Laboratory of Exploration Technologies for Oil and Gas Resources of the Ministry of Education, Yangtze University, Wuhan
[3] Research Institute of Petroleum Exploration & Development, PetroChina, Beijing
来源：
Diqiu Kexue - Zhongguo Dizhi Daxue Xuebao/Earth Science - Journal of China University of Geosciences | 2022年 / 47卷 / 04期
关键词：
Accumulation process; Evaporative fractionation; Melut basin; Palogue oilfield; Petroleum geology; Southern Sudan;
D O I：
10.3799/dqkx.2018.539
中图分类号：
学科分类号：
摘要：
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. © 2022, Editorial Department of Earth Science. All right reserved.
引用
收藏
页码：1459 / 1469
页数：10
相关论文
共 38 条
  • [1] Bao J.P., Si C.S., Jiang X.C., Et al., The Bimodal Distributions of n-Alkanes in the Post-Mature Marine Source Rocks and Solid Bitumen from the Northern Guizhou Depression, Acta Sedimentologica Sinica, 34, 1, pp. 181-190, (2016)
  • [2] Dou L.R., Formation Mechanism and Model of Oil and Gas Accumulations in the Melut Basin, Sudan, Bulletin of Mineralogy, Petrology and Geochemistry, 24, 1, pp. 50-57, (2005)
  • [3] Dou L.R., Cheng D.S., Li M.W., Et al., Unusual High Acidity Oils from the Great Palogue Field, Melut Basin, Sudan, Organic Geochemistry, 39, 2, pp. 210-231, (2008)
  • [4] Dou L.R., Pan X.H., Tian Z.J., Et al., Hydrocarbon Formation and Distribution of Rift Basins in Sudan-A Comparative Analysis of Them with Rift Basins in East China, Petroleum Exploration and Development, 33, 3, pp. 255-261, (2006)
  • [5] Dou L.R., Xiao K.Y., Cheng D.S., Et al., Petroleum Geology of the Melut Basin and the Great Palogue Field, Sudan, Marine and Petroleum Geology, 24, 3, pp. 129-144, (2007)
  • [6] Gao Y.Q., Liu L., Time Recording of Inorganic CO<sub>2</sub> and Petroleum Infilling in Wuerxun Depression, Hailaer Basin, Acta Sedimentologica Sinica, 25, 4, pp. 574-582, (2007)
  • [7] Genik G.J., Petroleum Geology of Cretaceous-Tertiary Rift Basins in Niger, Chad, and Central African Republic, AAPG Bulletin, 77, 8, pp. 1405-1434, (1993)
  • [8] Hanson A.D., Zhang S.C., Moldowan J.M., Et al., Molecular Organic Geochemistry of the Tarim Basin, Northwest China, AAPG Bulletin, 84, 8, pp. 1109-1128, (2000)
  • [9] He J.X., Xia B., Liu B.M., Et al., Origin, Migration and Accumulation of CO<sub>2</sub> in East China and Offshore Shelf Basins, Petroleum Exploration and Development, 32, 4, pp. 42-49, (2005)
  • [10] Jin Z.K., Bai W.H., Zhang X.X., Genetic Types and Distribution of Carbon Dioxide in the Huanghua Depression, Chinese Journal of Geology, 38, 3, pp. 350-360, (2003)
1234