The gas hydrate system of the western Black Sea Basin

• DOI: 10.1016/j.marpetgeo.2024.107026
• Publication Date: 2024-07-31T02:00:16Z
• Authors: Ewa Burwicz-Galerne; Matthias Haeckel; Christian Hensen; Rohit Samant; Klaus Wallmann
• Keywords: Clathrate hydrate; Black Sea

The basin-scale distribution of gas hydrates and methane migration pathways in the western Black Sea remains enigmatic, owing to region's complex geological history. Characterizing abundant hydrate accumulations across temporal scales poses significant challenges. In this study, we developed applied a 3D large-scale numerical model study formation, development, fate natural systems sub-basin. Our enables us simulate dynamic evolution basin geometry facies over last 98 million years under dynamically changing boundary conditions, e.g. due sea-level changes. estimates total volume stored within sediments at ∼14,607 MtC, equivalent ∼30,073 × 1011 m3 CH4 (at STP conditions) which is about 5 times higher than average density continental margins. findings reveal three distinct mechanisms driving reservoir formation reconstructed sub-basin: recycling zones, chimney-like structure deposits associated with paleo-deep sea fans. We identified simulated key controlling parameters, related regional geomorphology, governing each type formation. Subsequently, conduct detailed analysis systems, focusing on Dniepr paleo-fan system, Danube region, multiple offshore locations near Turkey, central area. Furthermore, investigate various biogenic kinetics their impact generation. sensitivity studies enable predict optimal temperature range for microbial activity methanogenesis 30 °C–40 °C. Overall, our provides novel understanding quantitative correlation between generation, migration, storage form Sea.