| DOI: | 10.1306/01021211094
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| Scopus记录号: | 2-s2.0-84865384014
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| 论文题名: | Present Jurassic petroleum charge facing Paleozoic biodegraded oil: Geochemical challenges and potential upsides, Embla field, North Sea |
| 作者: | Ohm S.E.; Karlsen D.A.; Phan N.T.; Strand T.; Iversen G.
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| 刊名: | AAPG Bulletin
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| ISSN: | 0149-1743
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| EISSN: | 1558-9473
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| 出版年: | 2012
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| 发表日期: | 2012
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| 卷: | 96, 期:8 | | 起始页码: | 1523
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| 结束页码: | 1552
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| 语种: | 英语
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| Scopus关键词: | Jurassic
; Light oil
; Mixing ratios
; North Sea
; Oil accumulation
; Oil and gas
; Oil water contact
; Paleozoic
; Pore space
; Pressure build up
; Reduced permeabilities
; Residual oil
; Source rocks
; Southern North Sea
; Triassic
; Biodegradation
; Microbiology
; Petroleum deposits
; Wells
; Geochronology
; biodegradation
; biomarker
; bitumen
; erodibility
; geochemical survey
; hydrocarbon generation
; Jurassic
; Paleozoic
; permeability
; petroleum
; pore space
; sealing
; source rock
; subsidence
; uplift
; Atlantic Ocean
; Ekofisk Field
; North Sea
; Norway
|
| Scopus学科分类: | Energy
; Earth and Planetary Sciences
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| 英文摘要: | The Embla field, located in the greater Ekofisk area of the Norwegian part of the southern North Sea, has been producing oil and gas since the early 1990s. The wells on the crest are the best and most continuous producers, whereas the wells on the flanks are only good producers over limited periods after pressure buildup. The reason for the poorer production from the flanks is reduced permeability caused by the presence of bitumen, a nonmovable biodegraded oil that fills the pore space. This oil is shown to be of Paleozoic age and is suggested to have charged the Embla field at the end of the Triassic. The structure was uplifted and eroded during the Jurassic, and the Paleozoic oil accumulation became biodegraded on the oilwater contact. The crest of the structure is believed to have been protected from biodegradation until the seal was eroded, which resulted in the escape of the oil and the biodegradation of the residual oil. Subsidence during the Cretaceous, the formation of a new seal, and the Upper Jurassic source rock intervals reaching oil window maturity resulted in the structure being recharged. Partly contradicting maturity estimates based on various biomarker ratios suggest that the analyzed oils represent different mixing ratios between the two oil generations. The change in light oil composition observed between the drillstem tests sampled approximately 20 yr ago and the presently produced oil suggests that the Embla field currently is receiving Jurassic-sourced oil. Copyright © 2012. The American Association of Petroleum Geologists. |
| URL: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-84865384014&doi=10.1306%2f01021211094&partnerID=40&md5=be35b961ab0765db36b6baefbf37cd49
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| Citation statistics: |
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| 资源类型: | 期刊论文
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/13313
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| Appears in Collections: | 过去全球变化的重建
影响、适应和脆弱性
科学计划与规划
气候变化与战略
全球变化的国际研究计划
气候减缓与适应
气候变化事实与影响
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| Recommended Citation: | |
Ohm S.E.,Karlsen D.A.,Phan N.T.,et al. Present Jurassic petroleum charge facing Paleozoic biodegraded oil: Geochemical challenges and potential upsides, Embla field, North Sea[J]. AAPG Bulletin,2012-01-01,96(8)
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