Petrophysical and microfacies analysis as a tool for reservoir rock typing and modeling: Rudeis Formation, off-shore October Oil Field, Sinai

Nabawy, Bassem S.; Rashed, Mohamed; Mansour, Ahmed S.; Afify, Walaa S.M.

doi:10.1016/j.marpetgeo.2018.07.011

Cited by 69 publications

(28 citation statements)

References 24 publications

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“…Processing of these two storage capacity and deliverability parameters enables estimation of the reservoir quality parameters including RQI and FZI of Amaefule et al (). This concept has been tested through the last two decades by many authors (e.g., Abed, ; Corbett & Potter, ; El Sharawy & Nabawy, , , ; Guo, Diaz, Paz, Smalley, & Waninger, ; Nabawy et al, ; Nabawy & Al‐Azazi, ; Nabawy & Barakat, ; Teh, Willhite, & Doveton, ; Tiab & Donaldson, ).…”

Section: Discussionmentioning

confidence: 99%

Impacts of microfacies type on reservoir quality and pore fabric anisotropy of the Nubia sandstone in the central Eastern Desert, Egypt

et al. 2019

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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 qualityreducing 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 (∅ He ) values which are measured by the helium injection for the first and third facies samples are good to excellent (14.6 ≤ ∅ 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. ∅ He = 19.2% and av. k = 557 md). The hydraulic pore anisotropy (λ k ) of the studied three petrophysical facies is isotropic to moderately anisotropic (1.02 ≤ λ k ≤ 1.96), whereas the electric pore anisotropy (λ E ) is less intensive (1.11 ≤ λ E ≤ 1.61).

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Section: Discussionmentioning

confidence: 99%

Impacts of microfacies type on reservoir quality and pore fabric anisotropy of the Nubia sandstone in the central Eastern Desert, Egypt

et al. 2019

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“…In the October Field, to the southwestern offshore parts of the studied area, the Rudeis Formation consists of sandstones, highly calcareous shales, and argillaceous limestones. Its geologic setting has been studied in detail by Nabawy, Basal et al (2018), Nabawy, Rashed et al (2018).…”

Section: Geologic and Structural Settingmentioning

confidence: 99%

“…The diagenetic processes in the reservoir rocks are the main and continuous control of the reservoir quality and its heterogeneity since its deposition till now. The diagenetic factors control both the petrofabrics and pore fabrics off the reservoir rocks, that is, they have a reducing or enhancing effects on storage and flow capacity of the reservoir and on its potential as a storage unit and controls its quality and its spatial distribution (Lai et al, 2017(Lai et al, , 2018Nabawy, Basal et al, 2018);Nabawy, Rashed et al, 2018).…”

Section: Impacts Of Diagenetic Factors On Reservoir Qualitymentioning

confidence: 99%

“…The reservoir quality is affected and controlled by many factors, for example, mineral composition and diagenetic history. It is a critical and complicated issue that has been studied intensively by many authors (El Sharawy & Nabawy, 2016;Lai et al, 2017Lai et al, , 2018Nabawy, 2018;Nabawy, Rashed, Mansour, & Afify, 2018;Nabawy, Basal, Sarhan, & Safa, 2018;Nabway & Kassab, 2014). They studied the impacts of lithofacies and microfacies types, as well as diagenetic factors, on the reservoir quality of sedimentary rocks.…”

Section: Introductionmentioning

confidence: 99%

“…The reservoir quality of the Lower Miocene Rudeis Formation in the Gulf of Suez has been studied in detail for many decades (Barakat, El-Gendy, & Emara, 2015;El-Khadragy, Shazly, Ramadan, & El-Sawy, 2017;Gadallah, El-Terb, El-Kattan, & El-Alfy, 2010;Nabawy, & Barakat, 2017;Nabawy, Basal et al, 2018;Nabawy, Rashed et al, 2018;Sallam, Afife, Fares, Loon, & Ruban, 2019;Tewfik, Harwood, & Deighton, 1992;Zaid, 2012). The present study concerns the Aquitanian-Burdigalian Rudeis Formation in the offshore and onshore central province of the Gulf of Suez ( Figure 1); it is bordered by latitudes 28°45 ' and 29°15'N and longitudes 32°55' and 33°20'E.…”

Section: Introductionmentioning

confidence: 99%

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Implementation of sedimentary facies and diagenesis on the reservoir quality of the Aquitanian‐Burdigalian Rudeis Formation in the Gulf of Suez, Egypt: A comparative surface and subsurface study

et al. 2019

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The Lower Miocene Rudeis Formation has been studied in two surface outcrops on the eastern onshore of the Gulf of Suez at Wadi Wasit and Sarbut El Gamal localities and in the subsurface sequence of October oil field in the central part of the Gulf of Suez. A correlative study between the subsurface sequence and its surface analogs was carried out to assess the reservoir quality of the Rudeis Formation and the impacts of the lithofacies, microfacies, pore types and dominant diagenetic processes on its reservoir quality. The Rudeis Formation consists of a thick carbonate-clastics succession. The lower part consists of a cyclic sequence of laminated, fossiliferous and argillaceous limestone intercalated with mudstone, and sandstones. These units are unconformably overlain by alternations of conglomerate, coarse sandstones, and limestones. It is documented that the clastic microfacies have good reservoir quality in the October Field and poor quality in Wadi Wasit. This is due to the impacts of dissolution and fracturing diagenetic processes. The carbonate microfacies are impervious due to effects of cementation, mechanical compaction, quartz overgrowth, authigenic minerals, and micritization.

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Mesoscopic Heterogeneity

Tavakoli¹

2019

Carbonate Reservoir Heterogeneity

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Petrophysical and microfacies analysis as a tool for reservoir rock typing and modeling: Rudeis Formation, off-shore October Oil Field, Sinai

Cited by 69 publications

References 24 publications

Impacts of microfacies type on reservoir quality and pore fabric anisotropy of the Nubia sandstone in the central Eastern Desert, Egypt

Impacts of microfacies type on reservoir quality and pore fabric anisotropy of the Nubia sandstone in the central Eastern Desert, Egypt

Implementation of sedimentary facies and diagenesis on the reservoir quality of the Aquitanian‐Burdigalian Rudeis Formation in the Gulf of Suez, Egypt: A comparative surface and subsurface study

Mesoscopic Heterogeneity

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