Folding of the Niger Delta in the Cenozoic and Its Related Traps
详细信息
- 责任者：Chen Shuping (State Key Laboratory of Petroleum Resource and Prospecting ; China University of Petroleum ; Beijing 102249 ; China) ; Wang Chunxiu
- 刊名：Geological Journal of China Universities
- 出版年：2013
- 卷期：19(2)
- 关键词：褶皱 ; folds ; 构造圈闭 ; structural traps ; 尼日尔 ; Niger
- 页码：p.355-363
- 图表：illus., 1 table, 30 refs.
- 分类号：1003
- issnNo：ISSN1006-7493
- isbnNo：CN32-1440/P
摘要
The Niger Oelta is an important oil-bearing area in the world and folds played an important role in its reservoir formation.By analyzing the exploration data,the types of folds and the sequential relationships among various kinds of folds are discussed.The Niger Delta can be divided into three tectonic belts,i.e.,tailing extensional belt,transitional belt,and leading compressive belt from the onshore to the offshore,respectively.The three belts constitute an integral gravitational sliding system.Rollover anticlines occurred in the extensional belt and the dominant traps were anticlines with fault blocks and lithology-stratum traps.Mudstone diapir-related drape anticlines occurred in the transitional belt and the dominant traps were anticlines with sand bodies at the banks of mudstone diapirs and between the diapirs.Thrust faulting-related anticlines occurred in the leading compressive belt and the main traps were anticlines with sand bodies at the banks of the anticlines and between the anticlines.Folding began at the Eocene,Miocene,and middle Miocene-Pliocene for these three belts,respectively.The shortening caused by folding was accommodated by extension in the extensional belt.The folding-related traps such as anticlines and sandstone lenses in various tectonic belts were the dominant traps that accumulated almost all the oil and gas reserves in the Niger Delta.
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