| DOI: | 10.1306/02211211075
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| Scopus记录号: | 2-s2.0-84869450962
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| 论文题名: | How clay grain coats inhibit quartz cement and preserve porosity in deeply buried sandstones: Observations and experiments |
| 作者: | Ajdukiewicz J.M.; Larese R.E.
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| 刊名: | AAPG Bulletin
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| ISSN: | 0149-1723
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| EISSN: | 1558-9453
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| 出版年: | 2012
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| 发表日期: | 2012
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| 卷: | 96, 期:11 | | 起始页码: | 2091
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| 结束页码: | 2119
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| 语种: | 英语
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| Scopus关键词: | Anhedral
; Authigenic
; Clay grains
; Clay particles
; Diagenetics
; Grain surface
; High temperature
; Hydrothermal reactor
; Moderate temperature
; Naturally occurring
; Petrophysical
; Porous sandstone
; Primary control
; Quartz cements
; Quartz grains
; Rock properties
; Secondary control
; Cements
; Coalescence
; Experiments
; Grain growth
; Nucleation
; Porosity
; Sandstone
; Scanning electron microscopy
; Quartz
; authigenesis
; burial diagenesis
; cement
; coalescence
; grain size
; hydrothermal system
; porosity
; quartz
; sandstone
; scanning electron microscopy
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| Scopus学科分类: | Energy
; Earth and Planetary Sciences
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| 英文摘要: | Observations and hydrothermal experiments were used to derive new information about how clay grain coats inhibit quartz cement and preserve porosity in deeply buried sandstones. Samples of deeply buried, porous sandstones with different types of clay coats were split in two, coats removed from one of each pair of splits, and grain surfaces inspected with scanning electron microscopy. Quartz grains in a fluvial-deltaic sandstone buried to 115°C had no visible authigenic quartz on grain surfaces cleaned of diagenetic chlorite coats, though well-developed overgrowths occurred on nearby, naturally uncoated grains. However, in similar sandstones buried to ≥164°C, quartz-grain surfaces exposed by chlorite-coat removal were covered with small (5 μm), mainly anhedral, syntaxial quartz overgrowths. Similar overgrowths were observed under various detrital and diagenetic clay coats in porous eolian sandstones buried to temperatures up to 215°C. We conclude that clay coats may retard quartz nucleation at moderate temperatures, but at high temperatures, many coats permit quartz nucleation and preserve porosity by limiting cement growth. To investigate cement growth-limitation mechanisms, samples with coats removed were subjected to quartz-cementing conditions in a hydrothermal reactor. During experiments, the naturally occurring small overgrowths on clay-cleaned grains coalesced and grew, suggesting that clay particles in coats inhibit cement growth by forming barriers to early-overgrowth coalescence. Although the fraction of grain-surface coverage is the primary control on cement inhibition by coats, cement growth-interference textures vary with coat type, providing a mechanism by which coat composition may be a secondary control on inhibitory effectiveness. In deeply buried sandstones, quartz cement can fill significant microporosity within diagenetic chlorite coats, potentially affecting mechanical and petrophysical rock properties. Copyright © 2012. The American Association of Petroleum Geologists. All rights reserved. |
| URL: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-84869450962&doi=10.1306%2f02211211075&partnerID=40&md5=7b901c1ef66b8f15558860d420c84ba3
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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/13293
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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: | |
Ajdukiewicz J.M.,Larese R.E.. How clay grain coats inhibit quartz cement and preserve porosity in deeply buried sandstones: Observations and experiments[J]. AAPG Bulletin,2012-01-01,96(11)
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