Total Organic Carbon Enrichment and Source Rock Evaluation of the Lower Miocene Rocks Based on Well Logs: October Oil Field, Gulf of Suez-Egypt

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.

Characterization of Upper Cretaceous Matulla and Wata clastic reservoirs from October field, Central Gulf of Suez, Egypt

“…Sercombe et al (1997Sercombe et al ( , 2012 and Gawad et al (2021b) interpreted the structural geology of the field and reservoir modeling aspects. Lashin and Mogren (2012) and Gawad et al (2021a) characterized the source rock properties and analyzed the petroleum system of the October field. Kassem et al (2020) studied the organic geochemical and isotope data of the Cenomanian-Turonian shales and limestones from the October field and linked the sediments with oceanic anoxic event 2 (OAE 2) which produced organic-rich intervals.…”

Fracture detection using conventional well logging in carbonate Matulla Formation, Geisum oil field, southern Gulf of Suez, Egypt

“…Subsidence moves potential source rocks to depths suitable for generation of hydrocarbon, whereas stretching movement can provide petroleum structural traps in the fault blocks for hydrocarbon accumulation. This is characteristic of rift basins (Lashin and Mogren 2012).…”