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Geosciences 2018, 8(4), 118; https://doi.org/10.3390/geosciences8040118

Formation MicroScanner Providing Better Answers for Carbonate Secondary Porosity in Alamein Dolomite Formation, NW Desert, Egypt

Department of Physical and Geological Sciences, Universiti Brunei Darussalam, JalanTungku Link, Gadong BE1410, Brunei Darussalam
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Received: 19 December 2017 / Revised: 6 March 2018 / Accepted: 13 March 2018 / Published: 2 April 2018
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Abstract

The use of borehole imaging tools has become widespread in recent years with more specialized studies of reservoir properties, particularly in highly-porous and fractured carbonate systems. In this study, the Formation MicroScanner (FMS) borehole imaging tool and conventional well log data have been used to study the secondary porosity of the dolomitic Alamein Formation in the Alamein Field, north Western Desert, Egypt. Based on well log analyses of the formation from Tourmaline-1X and N.Alamein-6X wells, we show that secondary porosity occurs across the formation, and is filled mostly with hydrocarbon. We also show that the formation has good average effective porosity and hydrocarbon saturation. FMS images of the Tourmaline-1X well confirms that the formation is intermittently vuggy with solution-filled channels from the top to its base. The vug pores are observed to be well-connected, which supports good effective porosity values interpreted from petrophysical data. An additional set of core photographs of the Alamein Formation from N.Alamein-5X well confirms the presence of secondary pores, which are filled by hydrocarbon, and exhibit intense fluorescence under UV light. Our results show that the abundance of secondary porosity in Alamein Formation would play a key role in evaluating its reservoir quality and reservoir performance. View Full-Text
Keywords: borehole imaging; secondary porosity; formation evaluation; Egypt; vugs; fractures; formation microscanner; north western desert; well logging; petrophysical borehole imaging; secondary porosity; formation evaluation; Egypt; vugs; fractures; formation microscanner; north western desert; well logging; petrophysical
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Shalaby, M.R.; Jumat, N.; Islam, M.A. Formation MicroScanner Providing Better Answers for Carbonate Secondary Porosity in Alamein Dolomite Formation, NW Desert, Egypt. Geosciences 2018, 8, 118.

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