Steps Towards a Complete CCS Storage Atlas in Greece: Workflow and Pilot Application

The Hellenic CO2 Geological Storage Atlas is a pilot project to establish a structured, transparent, and scientifically robust workflow for mapping, screening, ranking and assessing CO2 storage opportunities in Greece. The pilot phase of the Hellenic CO2 Geological Storage Atlas utilizes a probabilistic, stepwise workflow that successfully translates legacy hydrocarbon data into robust national-scale CO2 storage insights. Key outcomes include:

• Establishment of a probabilistic screening and ranking methodology for all ba-sins.
• First P10–P90 basin-scale storage capacity estimates.
• Development of an interactive GIS Atlas integrating geological and infrastructur-al data.
• Demonstration of the workflow in the Mesohellenic Basin pilot, advancing from screening to static/dynamic modeling.

Although this product is the first step, it provides the essential foundation for a fully functional national Atlas. The next phase will require systematic integration of the full national hydrocarbon archive and Geological Survey data, enhanced cooperation among Greek institutions, and site-specific appraisal campaigns. By following this structured workflow, Greece is well positioned to meet its NZIA obligations, accelerate national CCS deployment, and emerge as a regional storage hub for the Mediterranean.