Abstract
October oil field is one of the largest hydrocarbon-bearing fields which produces oil from the sand section of the Lower Miocene Asl Formation. Two marl (Asl Marl) and shale (Hawara Formation) sections of possible source enrichment are detected above and below this oil sand section, respectively. This study aims to identify the content of the total organic carbon based on the density log and a combination technique of the resistivity and porosity logs (Δlog R Technique). The available geochemical analyses are used to calibrate the constants of the TOC and the level of maturity (LOM) used in the (Δlog R Technique). The geochemical-based LOM is found as 9.0 and the calibrated constants of the Asl Marl and Hawara Formation are found as 11.68, 3.88 and 8.77, 2.80, respectively. Fair to good TOC% content values (0.88 to 1.85) were recorded for Asl Marl section in the majority of the studied wells, while less than 0.5% is recorded for the Hawara Formation. The lateral distribution maps show that most of the TOC% enrichments are concentrated at central and eastern parts of the study area, providing a good source for the hydrocarbons encountered in the underlying Asl Sand section.
Highlights
October Field is the third largest field in Egypt
This study aims to identify the content of the total organic carbon based on the density log and a combination technique of the resistivity and porosity logs (Δlog R Technique)
This study aims mainly to investigate the organic richness and to estimate the total organic carbon content (TOC%) of the Asl Marl section and Hawara Formation using a methodology based on the density log and combination of the resistivity and porosity tools
Summary
October Field is the third largest field in Egypt. It is structurally trapped in a complex of rotated fault blocks [1,2], a common scenario throughout the Gulf of Suez. The first platform (A) was installed in 1977 at the southwestern block of October concession, after the discovery of GS 195-1 well (OCT-A1) This well had an initial production rate of 14.000 BOPD from Nubia oil reservoir [4]. In 1989, the Asl reservoir sand (Miocene) was discovered by the drilling of NO 183-1 well, on the hanging wall of a large normal fault bounding the west of October field. From this date and upcoming a large number of wells were drilled in this newly discovered “J” named platform and around it [6]
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