globalchange  > 过去全球变化的重建
DOI: 10.1306/10211313002
Scopus记录号: 2-s2.0-84903625138
论文题名:
Porosity trends in the Skagerrak Formation, Central Graben, United Kingdom Continental Shelf: The role of compaction and pore pressure history
作者: Grant N.T.; Middleton A.J.; Archer S.
刊名: AAPG Bulletin
ISSN: 0149-1539
EISSN: 1558-9269
出版年: 2014
发表日期: 2014
卷: 98, 期:6
起始页码: 1111
结束页码: 1143
语种: 英语
Scopus关键词: Compaction ; Hydrocarbons ; Petroleum reservoirs ; Sandstone ; Anomalously high porosities ; Compaction control ; Effective reservoir ; Exploration targets ; Formation overpressure ; Reservoir property ; Sandstone reservoirs ; United kingdom continental shelves ; Porosity ; compaction ; continental shelf ; effective stress ; fluid flow ; graben ; high pressure ; hydrocarbon ; overpressure ; pore pressure ; porosity ; sandstone ; statistical analysis ; Atlantic Ocean ; North Sea ; Skagerrak ; United Kingdom
Scopus学科分类: Energy ; Earth and Planetary Sciences
英文摘要: This paper describes reservoir properties in the Triassic Skagerrak Formation in the Central North Sea. This prolific sandstone reservoir often possesses anomalously high porosity for its depth of burial. Simple statistical analysis of wire-line-log-derived porosity data is used to derive empirical trends as a function of both depth and vertical effective stress that show variations between neighboring hydrocarbon fields and between different parts of the basin. Porosity data from the Josephine (J) Ridge (Quadrant 30 of the United Kingdom Continental Shelf [UKCS]) show a marked degradation with depth, but the porosities are significantly higher than in similarly deeply buried areas such as the Puffin high to the west (Quadrant 29) or the Forties-Montrose high to the north (Quadrant 22). To understand the porosity patterns better the data have been analyzed by plotting against vertical effective stress. This allows a better comparison to be made between fields and wells within the high-pressure-high-temperature (HPHT) realm. High pressure here refers to fluid pressures above 10,000 psi (703 kg/cm), whereas high temperatures are above 300°F (149°C). Results show that porosity and fractional effective reservoir (the proportion of net sandstone with a porosity greater than a predetermined cutoff) decrease systematically with increasing vertical effective stress. Data from the different J Ridge fields fall on a common compaction trend even though they are derived from structures with marked variations in present-day depth of burial and static formation overpressure. Trends from the other areas of the Central Graben (the Puffin and Forties-Montrose highs) indicate more indurate reservoir states. The observed porosity trends are independent of fluid type within the reservoir and the absolute magnitude of overpressure. The main observed hydrocarbon effect is the result of buoyancy forces. The analysis supports the contention that, after accounting for facies-related grain-size variations, compaction controls average reservoir properties. Differences in compaction state between areas are postulated to relate primarily to structurally controlled timing of overpressure development relative to burial, and how these affect the resultant vertical effective stress history. Both the Puffin and Forties-Montrose highs are directly attached to the basin margins across stepped faults. These marginal terraces were open to lateral fluid flow for longer probably because across-fault seals were only established late in the burial history when higher temperatures promoted cementation and the destruction of permeability within fault cores. As a result, they developed overpressures in the last 5-10 m.y. or so and are largely normally compacted. The J Ridge horst block is hydrologically more isolated within the basin center by across-fault juxtaposition seals. Here, overpressure development appears to have started earlier, possibly between 50 and 60 Ma, retarding compaction and allowing preservation of higher porosities. Compaction continues to present day driven by the large static vertical effective stress gradients in these deeply buried reservoirs. The observed empirical trends offer a means of predicting average reservoir properties in deep untested exploration targets. Copyright © 2014. The American Association of Petroleum Geologists. All rights reserved.
URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84903625138&doi=10.1306%2f10211313002&partnerID=40&md5=10652c9b590e804cdad2716a2829b2c9
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/13110
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:
Grant N.T.,Middleton A.J.,Archer S.. Porosity trends in the Skagerrak Formation, Central Graben, United Kingdom Continental Shelf: The role of compaction and pore pressure history[J]. AAPG Bulletin,2014-01-01,98(6)
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