DOI: 10.130e/01151311163
Scopus记录号: 2-s2.0-84883579872
论文题名: The role of fluid pressure and diagenetic cements for porosity preservation in Triassic fluvial reservoirs of the Central Graben, North Sea
作者: Nguyen B.T.T. ; Jones S.J. ; Goulty N.R. ; Middleton A.J. ; Grant N. ; Ferguson A. ; Bowen L.
刊名: AAPG Bulletin
ISSN: 0149-1665
EISSN: 1558-9395
出版年: 2013
发表日期: 2013
卷: 97, 期: 8 起始页码: 1273
结束页码: 1302
语种: 英语
Scopus关键词: Anomalously high porosities
; Current production
; Fluid pressures
; Fluvial channels
; Fluvial reservoirs
; Pressure history
; Reservoir quality
; Sandstone diagenesis
; Chloride minerals
; Hydrocarbons
; Porosity
; Sandstone
; Scanning electron microscopy
; Sedimentology
; Cements
; burial diagenesis
; cementation
; channel
; fluid flow
; fluid pressure
; fluvial landform
; halite
; overpressure
; porosity
; sandstone
; scanning electron microscopy
; Triassic
; Atlantic Ocean
; North Sea
; Skagerrak
Scopus学科分类: Energy
; Earth and Planetary Sciences
英文摘要: Anomalously high porosities and permeabilities are commonly found in the fluvial channel sandstone facies of the Triassic Skagerrak Formation in the central North Sea at burial depths greater than 3200 m (10,499 ft), from which hydrocarbons are currently being produced. The aim of our study was to improve understanding of sandstone diagenesis in the Skagerrak Formation to help predict whether the facies with high porosity may be found at even greater depths. The Skagerrak sandstones comprise fine to medium-grained arkosic to lithic-arkosic arenites. We have used scanning electron microscopy, pétrographie analysis, pressure history modeling, and core analysis to assess the timing of growth and origin of mineral cements, with generation, and the impact of high fluid pressure on reservoir quality. Our interpretation is that the anomalously high porosities in the Skagerrak sandstones were maintained by a history of overpressure generation and maintenance from the Late Triassic onward, in combination with early microquartz cementation and subsequent precipitation of robust chlorite grain coats, increasing salinity of pore fluids during burial diagenesis led to pore-filling halite cements in sustained phreatic conditions. The halite pore-filling cements removed most of the remaining porosity and limited the precipitation of other diagenetic phases. Fluid flow associated with the migration of hydrocarbons during the Neogene is inferred to have dissolved the halite locally. Dissolution of halite cements in the channel sands has given rise to megapores and porosities of as much as 35% at current production depths. Copyright © 2013. The American Association of Petroleum Geologists. All rights reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84883579872&doi=10.130e%2f01151311163&partnerID=40&md5=debfc3bb125d82f7a8e430a5b2a60dbf
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/13235
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:
Nguyen B.T.T.,Jones S.J.,Goulty N.R.,et al. The role of fluid pressure and diagenetic cements for porosity preservation in Triassic fluvial reservoirs of the Central Graben, North Sea[J]. AAPG Bulletin,2013-01-01,97(8)