DOI: 10.1306/12031010092
Scopus记录号: 2-s2.0-79959951641
论文题名: Continuum-based rock model of a reservoir dolostone with four orders of magnitude in pore sizes
作者: Roth S. ; Biswal B. ; Afshar G. ; Held R.J. ; Øren P.-E. ; Berge L.I. ; Hilfer R.
刊名: AAPG Bulletin
ISSN: 0149-1859
EISSN: 1558-9589
出版年: 2011
发表日期: 2011
卷: 95, 期: 6 起始页码: 925
结束页码: 940
语种: 英语
Scopus关键词: Control volumes
; Discretizations
; Dolomite crystals
; Dolostones
; Electron microscope images
; Four-order
; Geometric objects
; High resolution
; Higher resolution
; Interconnected pore networks
; Macro scale
; Macropores
; matrix
; Matrix phasis
; Micro-scales
; Micropores
; Orders of magnitude
; Petrophysical properties
; Pore-size analysis
; Reservoir rock
; Rock fabrics
; Rock microstructure
; Rock sample
; Three dimensions
; X-ray tomographs
; Xray imaging
; Crystallography
; Electron microscopes
; Mineralogy
; Minerals
; Pore size
; Size distribution
; Solvents
; X rays
; Rocks
; anhydrite
; cement
; diagenesis
; dolostone
; electron microscopy
; image analysis
; magnitude
; mineralogy
; mudstone
; numerical model
; percolation
; petrography
; porosity
; reservoir
; rock mechanics
; rock microstructure
; size distribution
Scopus学科分类: Energy
; Earth and Planetary Sciences
英文摘要: A continuum-based pore-scale representation of a dolomite reservoir rock is presented, containing several orders of magnitude in pore sizes within a single rock model. The macroscale rock fabric from a low-resolution x-ray microtomogram was combined with microscale information gathered from high-resolution two-dimensional electron microscope images. The low-resolution x-ray microtomogram was segmented into six separate rock phases in terms of mineralogy, matrix appearances, and open- versus crystal-filled molds. These large-scale rock phases were decorated (modeled) with geometric objects, such as different dolomite crystal types and anhydrite, according to the high-resolution information gathered from the electron microscope images. This procedure resulted in an approximate three-dimensional representation of the diagenetically transformed rock sample with respect to dolomite crystal sizes, porosity, appearance, and volume of different matrix phases and pore/matrix/cement ratio. The resulting rock model contains a pore-size distribution ranging from moldic macropores (several hundred micrometers in diameter) down to mudstone micropores (<1 μm in diameter). This allows us to study the effect and contribution of different pore classes to the petrophysical properties of the rock. Higher resolution x-ray tomographs of the same rock were used as control volumes for the pore-size distribution of the model. The pore-size analysis and percolation tests performed in three dimensions at various discretization resolutions indicate pore-throat radii of 1.5 to 6 μm for the largest interconnected pore network. This also highlights the challenge to determine appropriate resolutions for x-ray imaging when the exact rock microstructure is not known. Copyright ©2011. The American Assodation of Petroleum Geologists. All rights reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-79959951641&doi=10.1306%2f12031010092&partnerID=40&md5=bf94cea87634866c177c8b3d723547dc
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/13428
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:
Roth S.,Biswal B.,Afshar G.,et al. Continuum-based rock model of a reservoir dolostone with four orders of magnitude in pore sizes[J]. AAPG Bulletin,2011-01-01,95(6)