ANALYSIS OF GAS FORMATION SOURCES, MIGRATION PATHWAYS, AND GAS PROSPECTIVITY IN THE MANGYSHLAK–USTYURT GEOSTRUCTURAL ZONES
Keywords:
Mangyshlak–Ustyurt Basin; Gas generation; Kerogen; Migration pathways; Geochemical modeling; Basin simulation; Gas prospectivityAbstract
The Mangyshlak–Ustyurt geostructural region, extending across western Kazakhstan and northwestern Uzbekistan, represents one of Central Asia’s most promising sedimentary basins for hydrocarbon exploration. This study investigates the geochemical characteristics, gas formation sources, and migration pathways controlling gas accumulation within this zone. Using integrated geochemical, structural, and simulation data — including PetroMod basin modeling, isotope composition analysis, and GIS-based spatial correlation — a hypothetical model was developed to predict gas generation and migration dynamics. The results indicate that the main gas-bearing horizons belong to the Devonian–Carboniferous and Jurassic sequences containing mixed Type II–III kerogen. Modeled temperature gradients (45–60 mW/m²) and burial depths (3–8 km) support active thermogenic gas generation. Gas migration occurs predominantly along NW–SE fault systems from source rocks toward structural traps in the Berdakh and Sudochi depressions. The study concludes that the Mangyshlak–Ustyurt geostructure retains high gas prospectivity, providing a conceptual framework for future exploration and development.
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References
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