Petrographical and petrophysical integrated studies, Jurassic rock samples, North Sinai, Egypt
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ORIGINAL PAPER
Petrographical and petrophysical integrated studies, Jurassic rock samples, North Sinai, Egypt Mohamed A. Kassab 1 & Hesham H. Abuseda 1 & Nahla A. El Sayed 1 & Amir M LaLa 2 & Osama M. Elnaggar 1
Received: 29 December 2014 / Accepted: 18 September 2015 / Published online: 22 February 2016 # Saudi Society for Geosciences 2016
Abstract For the hydrocarbon production enhancement and development, many petrophysical parameters are needed while some of them are usually calculated using relevant equations or even assumed by geologist or geophysicist. In the present study, 112 core samples obtained from six formations at Gebel El-Maghara Jurassic rocks, Mashaba Formation, Rajabia Formation, Shusha Formation, Bir Maghara Formation, Safa Formation, and Masajid Formation. The studied samples were classified into two following main groups: sandstone rock samples (27 samples) and carbonate rock samples (85 samples). Based on the mineralogical composition, texture, structure, and faunal content, thin section examination and scanning electron microscope study of Jurassic rocks at Gebel El-Maghara revealed that the studied carbonate rock samples were classified into five carbonate microfacies, biomicrite, fossiliferous biomicrite, sandy biomicrite, oobiosparite, and foraminiferal biomicrite, while the studied sandstone rock samples are mainly quartz arenite. The porosity of the studied samples is mainly primary
mixed with secondary porosity due to the effect of the diagenetic processes (cementation, dissolution, leaching, neomorphism, and compaction). The permeability of the most samples increases with increasing the porosity. The studied sandstone samples reflected good reservoir characteristics in some intervals due to high porosity and permeability, while fair to bad reservoir characteristics in some other intervals due to low porosity and permeability caused by matrix and diagenesis. The limestone reflected bad reservoir characteristics in the most intervals. The reservoir quality index depends mainly on permeability, where the high permeability offsets by the high reservoir quality and the low permeability offsets by the low reservoir quality, where the reservoir quality index with average values of 0.70 and 0.13 μm offsets by the permeability with average values 231.44 and 1.16 mD for sandstone and limestone rock samples, respectively. Keywords Jurassic rocks . Diagenesis . Porosity . Permeability . Reservoir quality index
Introduction * Mohamed A. Kassab [email protected] Hesham H. Abuseda [email protected] Nahla A. El Sayed [email protected] Amir M LaLa [email protected] Osama M. Elnaggar [email protected] 1
Egyptian Petroleum Research Institute, Naser City, Cairo 11727, Egypt
2
Ain Shams University, Cairo, Egypt
This work aims to throw more lights on mineralogical composition, diagenesis, environmental conditions, and petrophysical parameters (porosity, permeability, and rock density) and the relationships between these parameters controlling the reservoir quality for some of
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