Mesozoic and Cenozoic Fault Superposition Basin
详细信息
- 责任者：Pan Liangyun (Geological Research Center ; Research Institute of BGP ; CNPC ; Zhuozhou 072751 ; China) ; Zeng Zuoxun
- 刊名：Acta Geologica Sinica
- 出版年：2012
- 卷期：86(4)
- 关键词：叠合盆地 ; superposed basins ; 油气藏形成 ; reservoir formation ; 酒泉盆地 ; Jiuquan Basin
- 页码：p.535-547
- 图表：7 illus., 1 table, 56 refs.
- 分类号：1003
- issnNo：ISSN0001-5717
- isbnNo：CN11-1951/P
摘要
Based on identification markers of sedimentary basins such as tectonic settings and geometry of the basins,sedimentary structures,paleogeotemperature and volcanic rocks,it is concluded that Jiuquan basin is a Mesozoic and Cenozoic fault superposition basin,which was an extensional fault basin during Early Cretaceous and an intracontinental compressional fault basin and intercontinental foreland basin during Cenozoic.The basin of this kind is characterized by orthogonal superposition of between intracontinental fault basin or foreland basin and fault basin.Superposition modes of intracontinental fault superposition basins can be classified into drape,local and non-superposed.Based on the superposed structure location of the Cretaceous fault basin and intracontinental foreland basin,the superposition can be divided into four types: the superposition of the Cretaceous secondary sag with Cenozoic foreland thrust belt,the Cretaceous secondary sag with Cenozoic foreland depression,the Cretaceous secondary sag with Cenozoic foreland slope and the Cretaceous secondary sag with Cenozoic depression after foreland uplift.During the Mesozoic and Cenozoic,superposition basins controlled oil and gas accumulation.Early Cretaceous fault basin controlled the distribution of hydrocarbon source rock,and scale and quality of various oil-and gas-bearing depressions.During Middle Cenozoic,basin superposition not only promoted source rock mature,provided strong forces for oil and gas migration,but also played a vital role in formation of structure traps and oil-gas migration and development of reservoirs fissures.It is the differences of superposition modes and various secondary depression intensities that jointly resulted in the differences of oil and gas migration and accumulation,reservoir characteristics and enrichment degree.