干旱区生态环境知识资源中心(Arid): Impacts of microfacies type on reservoir quality and pore fabric anisotropy of the Nubia sandstone in the central Eastern Desert, Egypt

Arid

DOI	10.1002/gj.3690
	Impacts of microfacies type on reservoir quality and pore fabric anisotropy of the Nubia sandstone in the central Eastern Desert, Egypt
	Nabawy, Bassem S.1; Khalil, Hamza M.2; Fathy, Mohamed S.2; Ali, Fatma 2
通讯作者	Nabawy, Bassem S.
来源期刊	GEOLOGICAL JOURNAL
ISSN	0072-1050
EISSN	1099-1034
出版年	2020
卷号	55 期号:6 页码:4507-4524
英文摘要	The Nubia sandstone has a high potential for water and hydrocarbons exploration in its subsurface extensions. The present work aims to study the Nubia sandstone at Gebel Duwi in the central Eastern Desert to characterize its lithostratigraphic setting, microfacies types, and its petrophysical properties. In addition, impacts of mineral composition and diagenetic history of the Nubia sandstone on its storage and deliverability capacities and on its hydraulic and electric pore fabrics will be estimated. The Nubia sandstone is subdivided into three informal members: a lower trough cross-bedded, coarse-grained with little mud braided fluvial member; a middle planar cross-bedded sandstone with ferruginous siltstone intercalations of meandered fluvial member; and an upper gypsiferous coarsening upward clastic coastal to deltaic sediments. The microfacies analysis indicated that six microfacies are present: quartz arenite, subarkose, arkose, sublitharenite, ferruginous greywacke, and ferruginous siltstone microfacies. Several types of diagenetic processes affected the Nubia sandstone; cementation, compaction, and pressure solution are the main reservoir quality-reducing factors, whereas fracturing, dissolution, and leaching out are the most important reservoir quality-enhancing factors. For the present study, helium and water porosities, air permeability, and electric resistivities (for plugs drilled in three perpendicular directions for each block sample) were measured. Petrophysically, the studied Nubia sandstone can be summed up into three petrophysical facies: Facies-1 (quartz arenite and subarkose), Facies-2 (ferruginous subarkose to greywacke), and Facies-3 (sublitharenite and arkose). The slight ferruginous and clay content of the second facies has slightly increased the grain density values and reduced its storage capacity and deliverability. Porosity ( null (He)) values which are measured by the helium injection for the first and third facies samples are good to excellent (14.6 <= null (He) <= 28.9%), whereas their permeability (k) values are good to excellent (106 <= k <= 2231 md). The second facies is characterized by relatively less petrophysical potential than the other two facies (av. null (He) = 19.2% and av. k = 557 md). The hydraulic pore anisotropy (lambda(k)) of the studied three petrophysical facies is isotropic to moderately anisotropic (1.02 <= lambda(k) <= 1.96), whereas the electric pore anisotropy (lambda(E)) is less intensive (1.11 <= lambda(E) <= 1.61).
英文关键词	diagenesis Gebel Duwi microfacies Nubia sandstone pore fabric porosity
类型	Article
语种	英语
国家	Egypt
收录类别	SCI-E
WOS记录号	WOS:000536930700023
WOS关键词	POROSITY EXPONENT ; ARCHIES EQUATION ; LITHOLOGY FACTOR ; PETRO-FABRICS ; CENTRAL GULF ; DIAGENESIS ; BASIN ; SUEZ ; TOOL ; CONDUCTIVITY
WOS类目	Geosciences, Multidisciplinary
WOS研究方向	Geology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/318725
作者单位	1.Natl Res Ctr, Dept Geophys Sci, Cairo, Egypt; 2.Tanta Univ, Dept Geol, Fac Sci, Tanta, Egypt
推荐引用方式 GB/T 7714	Nabawy, Bassem S.,Khalil, Hamza M.,Fathy, Mohamed S.,et al. Impacts of microfacies type on reservoir quality and pore fabric anisotropy of the Nubia sandstone in the central Eastern Desert, Egypt[J],2020,55(6):4507-4524.
APA	Nabawy, Bassem S.,Khalil, Hamza M.,Fathy, Mohamed S.,&Ali, Fatma.(2020).Impacts of microfacies type on reservoir quality and pore fabric anisotropy of the Nubia sandstone in the central Eastern Desert, Egypt.GEOLOGICAL JOURNAL,55(6),4507-4524.
MLA	Nabawy, Bassem S.,et al."Impacts of microfacies type on reservoir quality and pore fabric anisotropy of the Nubia sandstone in the central Eastern Desert, Egypt".GEOLOGICAL JOURNAL 55.6(2020):4507-4524.