Petroleum Geologic Features and Exploration Potentials in Deep-Sea Fan, Bay of Bengal
详细信息
- 责任者：Wu Yiping (Research Institute of Petroleum Exploration & Development ; PetroChina ; Beijing 100083 ; China) ; Zhang Yanmin
- 刊名：Petroleum Geology & Experiment
- 出版年：2013
- 卷期：35(1)
- 关键词：油藏 ; oil reservoirs ; 孟加拉湾 ; Bengal Bay
- 页码：p.48-52,58
- 图表：illus., 24 refs.
- 分类号：1003
- issnNo：ISSN1001-6112
- isbnNo：CN32-1151/TE
摘要
The deep-sea fan of the Bay of Bengal served as the main body for the LST of deep sequence.Tertiary complex sand bodies with giant thickness deposited.5 sequence boundaries were identified.3 sets of source rocks in the Bhuban Formation of Miocene,the Jenam Formation of Oligocene and the Kopili Formation of Eocene gave birth to hydrocarbon during the early Pleiocene(5 Ma),the end of Oligocene(29.3 Ma) and the end of Paleogene(23.3 Ma),respectively.Deepwater turbidity sandstones worked as the main reservoir,and were featured by a depositional model of multi-period vertical overlap.Oligocene-Miocene reservoir and seal assemblage was the most favorable.Vertically,faults,unconformities and continuously-distributed sand bodies provided good pathways for petroleum migration.The possible accumulation models belong to stratigraphic reservoirs of "above-generation and below-storage" or complex ones.Natural gas is the dominant product in the deep water zone of the Bay of Bengal.Therefore,the Tertiary aggradational confined channel complexes in the deep-water basin of the Bay Rim of Bengal,such as the upper-middle deep water fans of the Ganges river system and the Indian eastern sea,as well as the natural alluvial sand embankments near to "bottomless channel" in the middle-lower deep water fans are considered as the most potential zones.