Global perspectives on evaluating effective porosity and permeability: Insights from hydrocarbon reservoirs in the Lower Rutba Formation, Sijan Field, Syria

Purpose. This paper aims to evaluate the petrophysical characteristics of the Lower Rutba Formation in the Sijan Field, Syria, focusing on effective porosity and permeability, and their influence on hydrocarbon productivity. The study intends to develop a practical and cost-effective model for optimizing hydrocarbon recovery, contributing to energy resource sustainabi-lity and global energy security. Methods. The research utilizes log data from 10 wells in the Sijan Field. Sonic, density, and neutron logs were employed to calculate porosity and permeability, while water saturation was estimated using the Archie equation. A comparative analysis across wells was conducted to determine reservoir quality variations and identify high-potential production zones. Findings. Results revealed significant heterogeneity in petrophysical properties across the field. Wells such as SIJ.110 showed high effective porosity and good permeability, indicating enhanced hydrocarbon storage and flow capacity. In contrast, wells with elevated clay content, such as SIJ.115, displayed low permeability and diminished reservoir quality. Saturation maps effectively highlighted zones with promising production potential. Originality. The paper introduces a novel integration of log interpretation and mathematical modeling, enabling permeability estimation without core samples. This approach enhances reservoir evaluation, particularly in sandy clay formations, and is adaptable to similar geological settings worldwide. Practical implications. The study provides a robust and economical framework for assessing reservoir quality. It reduces dependency on core data, supports targeted field development, and promotes sustainable hydrocarbon extraction through improved decision-making in reservoir management.