Evaluation of Reservoir Geological Parameters for CO2 Capture and Storage, The Depleted Obaiyed Gas Field, North Western Desert, Egypt

Document Type

Article

Publication Date

2026

Abstract

Carbon capture and storage (CCS) is a technology that captures Carbon dioxide (CO₂) from point sources, transports it through pipeline and injects it for storage safely in deep subsurface reservoirs. Evaluation of a subsurface geological parameters to store CO2 safely is an essential process to establish a successful (CCS) project. The main purpose of this paper is to evaluate reservoir (Lower Safa Member) geological parameters to show at what extend the studied reservoir suitable for (CCS) project. This work demonstrates the geophysical workflow by using Seismic and well data for (CCS) geological reservoir parameters; site containment, capacity and injectivity.

Seismic data used to map and delineate Lower Safa potential CCS container. Site containment was validated by analysing the trap setting of the studied container which proved to hold around 75 m hydrocarbon column height for long time that indicates effective lateral and top seals. Reservoir properties derived from petrophysical evaluation (8% porosity, 75 m total thickness, and 67% net to gross) then applied in the container area (4.7 km2) to estimate container Pore Rock Volume (PRV) that indicates storage capacity. The reservoir injectivity assessed by utilizing available core porosity and permeability from wells. A neural network Petrel module approach used to classify Lower Safa reservoir zone (unit1-3) within the container into four classes and ranking them in term of quality; the classes (1 and 2) are optimum for CO2 injection. The applied workflow identified Lower Safa reservoir in Obaiyed depleted gas Field as a promising candidate for CCS implementation.

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