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Vol.3 , No. 3, Publication Date: Jun. 15, 2016, Page: 28-32
 transgression. Nuclear magnetic resonance (NMR) measurements have been carried out in 30 sandstone core samples, obtained from this formation. The estimated transverse relaxation times (T<sub>2</sub>) fall in the interval of 100 µs and 600. µs. Application of a model related core-porosity and (T<sub>2</sub>) measured from NMR spectrum have allowed determination of the cementation exponent of Wyllie’s type with high accuracy. Consequently, it is possible to enhance in the determination of the water saturation and hydrocarbon saturation. The irreducible water saturation (S<sub>wirr</sub>) calculated from the mercury injection capillary pressure (MICP) measurements is found to be related to the normalized area under < 4 µs of (T<sub>2</sub>). Use of a regression model with a reliable coefficient of correlation has permitting calculation of (S<sub>wirr</sub>) with high accuracy. The natures of lithologic laminations present in some intervals of the Bahariya Formation have been examined using both measurements of (MICP) and (T<sub>2</sub>). Thin sections and SEM-micrographs were made for some selected core samples in order to recognize petrography and mineralogy of the Bahariya sandstones. Glauconitic, mica, zircon, rutile and pyrite minerals are found to be predominant in the laminated sandstone intervals.&picture=http://www.aascit.org/aascit/decorators/img/journal/899.jpg)
| [1] | Abdel Moktader A. El Sayed, Department of Geophysics, Ain Shams University, Cairo, Egypt. |
| [2] | Nahla A. El Sayed, Egyptian Petroleum Institute, Nasr City, Cairo, Egypt. |
The Bahariya Formation in the Western Desert of Egypt is a sedimentary sequence which was deposited under fluvial to shallow marine conditions at the beginning of the Upper Cretaceous (Cenomanian) transgression. Nuclear magnetic resonance (NMR) measurements have been carried out in 30 sandstone core samples, obtained from this formation. The estimated transverse relaxation times (T2) fall in the interval of 100 µs and 600. µs. Application of a model related core-porosity and (T2) measured from NMR spectrum have allowed determination of the cementation exponent of Wyllie’s type with high accuracy. Consequently, it is possible to enhance in the determination of the water saturation and hydrocarbon saturation. The irreducible water saturation (Swirr) calculated from the mercury injection capillary pressure (MICP) measurements is found to be related to the normalized area under < 4 µs of (T2). Use of a regression model with a reliable coefficient of correlation has permitting calculation of (Swirr) with high accuracy. The natures of lithologic laminations present in some intervals of the Bahariya Formation have been examined using both measurements of (MICP) and (T2). Thin sections and SEM-micrographs were made for some selected core samples in order to recognize petrography and mineralogy of the Bahariya sandstones. Glauconitic, mica, zircon, rutile and pyrite minerals are found to be predominant in the laminated sandstone intervals.
Keywords
Bahariya Formation, NMR Relaxometry, Capillary Pressure, Irreducible Water Saturation, Egypt
Reference
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