Formation evaluation of middle Miocene reservoirs via petrophysical analysis of well logging data; Case study from Southern part of Gulf of Suez, Egypt

Articles in Press

Document Type : Research Article

Authors

1 Geophysics department, faculty of science, cairo university

2 Geophysics department, faculty of science, Cairo university

3 Geophysics Department, Faculty of Science, Cairo university

Abstract

Amal oil field is located in the southern part of the gulf of suez. Amal field produces hydrocarbon mainly from middle Miocene reservoirs. Middle Miocene reservoirs in the southern part of the Gulf of Suez province are marked by uncertainties because of the complexities of their design, lateral facies change, different lithologies, and diverse reservoirs quality. Therefore, in this approach, different reservoir properties of Belayim Formation (Hammam Faraun Member or Zone), Kareem Formation (Markha Member or Zone), and Rudies Formation (Upper Rudies Member or Zone) are obtained and evaluated. The wireline logging data of 4 wells were used mainly for the petrophysical analyses of hydrocarbon reservoirs. The three most important parameters in petrophysical evaluation : shale content, porosity and fluids saturation are calculated for the middle Miocene reservoirs to construct the litho-saturation model for each well. Each of these parameters are mapped to study their areal variation across the study area and estimate the appropriate locations for the new development wells. Fluid saturations (water and hydrocarbon) are estimated based on the Indonesian formula due to shale presence. The study exhibited that Hammam Faraun reservoir was concluded with porosity values ranging from 0.15 to 0.17, the porosity values increase toward the central part of the area, Volume of shale (Vsh) ranging from 0.3 to 0.36, water saturation (Sw) ranging from 0.34 to 0.6, and the sandy facies increase toward the central of the area. The lower zone of the Kareem formation, which is represented by Markha, is also marked as a good reservoir, with porosity values increase toward the central part of the area with values ranging from 0.15 to 0.23, Vsh ranging from 0.12 to 0.28, water saturation ranging from 0.33 to 0.51, and nice sandy facies accumulating in the central horst block. Upper Rudies exhibit good reservoir properties with porosity values ranging from 0.12 to 0.27, Vsh ranging from 0.19 to 0.37, water saturation ranging from 0.48 to 0.6, and good sandy facies in the central horst block of the area. Based on the petrophysical evaluation and the petrophysical maps, the central part of the field is very promising for the development/production activities.The main goal of the current study was the interpretation of geological and geophysical data to assess lithofacies, and petrophysical characteristics of Middle Miocene reservoirs in the southern Gulf of Suez, as well as their distribution. In order to estimate the distribution and quality of the intricate Middle Miocene reservoirs and to lessen uncertainty during oilfield development in the research area, we employed integrated datasets in this work.

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Iranian Journal of Geophysics

Articles in Press, Accepted Manuscript
Available Online from 30 September 2023

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