Formation Conditions and Segment Correlation of the Giant Oil Gas Fields in Passive Continental Margin Basins in West Africa
详细信息
- 责任者：Wen Zhixin (Research Institute of Petroleum Exploration and Development ; PetroChina ; Beijing 100083 ; China) ; Wan Lunkun
- 刊名：Xinjiang Petroleum Geology
- 出版年：2013
- 卷期：34(5)
- 关键词：油气田 ; oil and gas fields ; 成藏模式 ; pool-formed model ; 西非 ; West Africa
- 页码：p.607-613,496
- 图表：5 illus., 20 refs.
- 分类号：1003
- issnNo：ISSN1001-3873
- isbnNo：CN65-1107/TE
摘要
Based on plate tectonics theory and various useful information or data,this paper presents the formation and evolution procedures of the coastal prototype basins in West African,the stage correlation of paleo-sedimentary environment changes and their controlling effects on the giant oil-gas fields’ formation conditions,and develops the hydrocarbon accumulation modes for the giant oil-gas fields in such three stages and four types of basins. It suggests that the three-segment basins in this area underwent three prototype stages such as the Late Jurassic-Early Cretaceous intra-continental rift stage,the Early Cretaceous intercontinental rift as a transition stage and the Early Cretaceous passive continental margin as a drift stage in West Africa. In the south segment formed the rift sequence structural-lithologic mode,due to little passive continental margin sequence; in the middle segment,the salt-bearing basins were characterized by transitional intercontinental rift halite,with the upper and the lower drift marine and rift lagoonal sediments which are all as premium source rocks,whereas the halite and marine shale as premium cap rocks,forming"dual-source and dual-seal"mode; in the north segment,the transitional basins were of great thickness of drift marine sediments,where narrow shelf and steep slope gave rise to drift turbidite sand bodies mode.Also,Niger delta basin with the unique high construction base formed"delta turbidite sand body"mode,in which the inner-ring rolling anticline belt is of the richest oil and gas,and giant oil-gas fields have been found in the turbidite sand bodies in the central anticline belt with muddy anticline belt and the outside ring thrust and compressional anticline belt.
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