Petrographic and petrophysical investigation on carbonate samples (Upper Cretaceous) from the Tushka Area (Egypt) with special focus on the effective pore radius

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• 作者：Ümit Öner ; Andreas Weller ; Carl-Diedrich Sattler…
• 关键词：Tushka Area ; Egypt ; Limestone ; Petrophysical properties ; Porosity ; Permeability
• 刊名：Arabian Journal of Geosciences
• 出版年：2016
• 出版时间：March 2016
• 年：2016
• 卷：9
• 期：3
• 全文大小：1,270 KB
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• 作者单位：Ümit Öner (1)
  Andreas Weller (1)
  Carl-Diedrich Sattler (2)
  Mohamed A. Kassab (3)
  
  1. Institut für Geophysik, Technische Universität Clausthal, Arnold-Sommerfeld-Str. 1, 38678, Clausthal-Zellerfeld, Germany
  2. Institut für Geologie und Paläontologie, Technische Universität Clausthal, Leibnizstraße 10, 38678, Clausthal-Zellerfeld, Germany
  3. Egyptian Petroleum Research Institute (EPRI), El Zohour Region, Naser City, Cairo, Egypt
  
• 刊物类别：Earth and Environmental Science
• 出版者：Springer Berlin Heidelberg
• ISSN：1866-7538

文摘

Petrographic and petrophysical properties of 42 carbonate rock samples from the Tushka Area, Egypt have been investigated. The samples originate from the Upper Cretaceous taken from seven shallow wells and were subdivided into three microfacies. The petrographic characterization of the glauconite-rich, fossiliferous limestones was carried out over 17 thin sections and an additional measurement of the glauconite content by color differentiation. The facies were characterized as (1) oolithic, low-dolomitic, and low-glauconitic, fossil-rich packstone with a tendency towards floatstone or rudstone; (2) glauconite-rich, low-dolomitic floatstone with a tendency towards rudstone; and (3) glauconite and iron mineral-rich, sparry calcitic cemented, and low-dolomitic rudstone. The petrophysical investigation providing grain density, porosity, electrical conductivity, specific internal surface, permeability, magnetic susceptibility, and the pore throat geometry supports the classification into three facies. A strong relation between permeability and formation factor is observed. The median pore radius derived from mercury porosimetry proves to be a good estimate of the effective hydraulic radius. An increased content of iron oxides was identified in facies 3. The increased iron content is related to higher values of both magnetic susceptibility and specific internal surface.