DOI: 10.1306/12090909075
Scopus记录号: 2-s2.0-79951528589
论文题名: Reactive transport modeling of early burial dolomitization of carbonate platforms by geothermal convection
作者: Whitaker F.F. ; Xiao Y.
刊名: AAPG Bulletin
ISSN: 0149-1928
EISSN: 1558-9658
出版年: 2010
发表日期: 2010
卷: 94, 期: 6 起始页码: 889
结束页码: 917
语种: 英语
Scopus关键词: Carbonate platforms
; Diagenetics
; Dolomitization
; High-temperature experiments
; Key control
; Low permeability
; Non-Linearity
; Quantitative investigation
; Reactive bed
; Reactive surface area
; Reactive transport modeling
; Reactive transport models
; Relative sea level
; Reservoir quality
; RTM simulation
; Sediment permeability
; Shallow depths
; TOUGHREACT
; Anoxic sediments
; Models
; Sea level
; Seawater
; Stratigraphy
; Sedimentology
; boundary condition
; burial (geology)
; carbonate
; diagenesis
; dolomitization
; experimental study
; geometry
; geothermal system
; nonlinearity
; numerical model
; permeability
; quantitative analysis
; reactive transport
; reservoir
; sea level change
; seawater
; sediment analysis
; stratigraphy
; surface area
; temperature effect
Scopus学科分类: Energy
; Earth and Planetary Sciences
英文摘要: Reactive transport models (RTMs) permit quantitative investigation of diagenesis and its effects on reservoir quality. The RTM TOUGHREACT is used to investigate diagenesis in an isolated platform driven by geothermal (Kohout) convection of seawater, which has been invoked to explain dolomitization during early burial. Previous short (0.1 m.y.) RTM simulations suggested that convection can drive dolomitization, mostly at greater than 50°C, and anhydritization, but complete dolomitization requires greater than 30-60 m.y. Our more extended RTM simulations (<30 m.y.) indicate significant nonlinearities in the system, consistent with high-temperature experiments, with parts of the platform completely dolomitized within 10-15 m.y. As dolomitization proceeds, the process becomes predominantly flux controlled, with development of a wedge-shaped dolomite body, which thins from the margin to the interior, at considerably shallower depth and cooler temperatures (20-30°C) than suggested by short simulations. Dolomitization is relatively insensitive to boundary conditions such as relative sea level and platform geometry but is significantly slower in circular than elongate platforms. Sediment permeability and reactive surface area, commonly inversely related, are key controls. Dolomitization is limited to the margin of low-permeability muddy platforms despite a high reactive surface area. Dolomitization of more permeable grainy platforms is limited by a lower reactive surface area, occurring only in the platform core due to widespread cooling. Sedimentary layering produces a complex diagenetic stratigraphy, dolomitization favoring more reactive beds at shallow depth where permeability is not limiting, but switching to more permeable beds at depth. Bank-marginal fracturing limits dolomitization of the platform interior, whether the fractures are baffles or conduits for flow. Copyright ©2010. The American Assodation of Petroleum Geologists. All rights reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-79951528589&doi=10.1306%2f12090909075&partnerID=40&md5=a6efbcd999c8e9a25e5615e988298223
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/13497
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:
Whitaker F.F.,Xiao Y.. Reactive transport modeling of early burial dolomitization of carbonate platforms by geothermal convection[J]. AAPG Bulletin,2010-01-01,94(6)