Impacts of dolomitization on the petrophysical properties of El-Halal Formation, North Sinai, Egypt

Nabawy, Bassem S.

doi:10.1007/s12517-011-0369-5

Cited by 43 publications

(3 citation statements)

References 21 publications

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“…From the literatures, m varies from slightly less than 1.0 up to 5.12 for well-consolidated rocks, as the lithology factor may reach high values up to 9.0 for Fig. 8 Dependence of the electric anisotropy λ E on a electric foliation F E and b electric lineation L E for the studied petrophysical facies Table 2 Petrophysical and electric pore fabric parameters for the studied Albian-Cenomanian facies in north Eastern Desert σ b bulk density, σ g grain density, ∅c connected porosity, F formation resistivity factor, F av average F, T electric tortuosity, F E electric foliation, L E electric lineation, λ E electric anisotropy carbonate rock samples (Wyble 1958;Aguilera 1976;Keller 1982;Jorgensen 1988;Salem and Chilingarian 1999;Nabawy 2013;Nabway and Kassab 2013). For the present samples, the relatively high a value for facies 1 may be attributed to its calcareous content, whereas the relatively low a value for facies 3 may be attributed to its clay content.…”

Section: Discussionmentioning

confidence: 99%

Pore fabric assignment using electrical conductivity of some Albian–Cenomanian sequences in north Eastern Desert, Egypt

2014

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The electric pore fabric concept has been testified in many previous studies, mostly concerned with sandstone rock samples. The present study is a further trial to testify the reliability of the proposed concept on carbonate and clastic facies. The studied facies are representative for the AlbianCenomanian Raha and Abu Qada Formations at the western side of the Gulf of Suez in Egypt. A total of 37 samples have been studied petrophysically by measuring electric conductivity in 3-D to rank their petrophysical potentiality and to detect their electric pore fabric. The studied samples are grouped into four facies, namely: (1) facies 1 (calcareous sandy siltstones) and (2) facies 4 (glauconitic quartz arenite) as clastic facies as well as (3) facies 2 (bioclastic limestones, and dolostones) and (4) facies 3 (clayey to sandy limestones) as carbonate facies. Porosity values of the studied carbonate facies are very good due to dolomitization and dissolution, whereas porosity values of the clastic facies are poor due to their high clay content. The formation resistivity factor values are low to medium values due to the reducing effect of the clay content and the very good porosity values. Archie's parameters a and m are mostly related to the formation resistivity factor and to some extent to the mineralogical composition as well as the electric tortuosity. The electric pore fabrics of the studied facies are slightly anisotropic, mostly as primary depositional fabrics affected by slight foliation rather than lineation. Presence of a slight fracturing system can be revealed by assigning the minimum formation resistivity factor through the vertical direction perpendicular to the bedding plain. However, the fracturing system is still not strong enough to affect the electric pore anisotropy by increasing the electric pore lineation as a secondary fabrics' indicator.

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Section: Discussionmentioning

confidence: 99%

Pore fabric assignment using electrical conductivity of some Albian–Cenomanian sequences in north Eastern Desert, Egypt

2014

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“…Petrophysical studies were used to determine the extent to which the petrophysical behavior was affected by the diagenetic events. Petrophysical data that was extracted revealed that they aren't homogeneous to a large extent, the nonhomogeneous depended on rock type and their pore space distribution, mineralogical composition, fossils, clay content and size of crystal, [42]. The following is a discussion of the studied petrophysical behaviors.…”

Section: Petrophysical Relationshipsmentioning

confidence: 99%

Petrographical and petrophysical properties of the Upper Cretaceous Matulla Formation at Gabal Libni, Sinai, Egypt

Abuseda

Nabawy

Kassab

et al. 2023

Journal of Petroleum and Mining Engineering

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The present work aims to flash up at the microfacies and integration of reservoir properties of 86 core limestone samples collected from Matulla Formation (Upper Cretaceous) at Gabal Libni were collected. The studied Matulla Formation is classified into five types of microfacies: Dolostone, Echinoidal foraminiferal grainstone, Echinoidal foraminiferal packstone, Echinoidal bioclastic packstone/grainstone, and Molluscan echinoidal packstone, the studied samples reveals most of the carbonate samples were tight, and various diagenetic processes including Dolomitization, Neomorphism, and Dissolution with iron oxides, carbonates, or clays. The porosity of rock samples directly affects the bulk density, as it increases if the porosity is filled by oxides (iron oxide) or cemented by clay content (cementation). The limestone reservoir reflects poor characteristics in most intervals as a result of low porosity and low permeability due to matrix and diagenesis. The reservoir quality index (RQI) is controlled mainly by permeability and the reservoir quality of carbonate rock samples are very low. The FZI for all carbonate microfacies ranged from 0.06 to 1.91 μm which infers impervious to poor reservoir quality. The pore throat radius R35 ranges from 0.01 to 2.66 µm, comprised of micromesoporosity 0.01 µm < R35 ≤ 2 µm, due to their tight nature, are generally impervious to poor flow potential and the studied carbonate microfacies are expressed by two hydraulic flow units.

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“…The lower average permeability of F2 is seemingly more strongly influenced by smaller pore diameter (i.e. : reduced cross-sectional area of pores and pore throats) than by the calculated tortuosity (Nabawy, 2013;Kassab et al, 2014). The permeability in some samples of Facies F4 is anomalously higher [e.g.…”

Section: Derivation Of Saturation Exponent From Formation Resistivitymentioning

confidence: 99%

Reservoir characterization of the Lower Abu Madi Formation using core analysis data: El-Wastani gas field, Egypt

Kassab

Teama

Cheadle

et al. 2015

Journal of African Earth Sciences

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Impacts of dolomitization on the petrophysical properties of El-Halal Formation, North Sinai, Egypt

Cited by 43 publications

References 21 publications

Pore fabric assignment using electrical conductivity of some Albian–Cenomanian sequences in north Eastern Desert, Egypt

Pore fabric assignment using electrical conductivity of some Albian–Cenomanian sequences in north Eastern Desert, Egypt

Petrographical and petrophysical properties of the Upper Cretaceous Matulla Formation at Gabal Libni, Sinai, Egypt

Reservoir characterization of the Lower Abu Madi Formation using core analysis data: El-Wastani gas field, Egypt

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