A disequilibrium compaction model constrained by seismic data and application to overpressure generation in The Eastern Black Sea Basin

摘要: Locating and quantifying overpressures are essential to understand basin evolution hydrocarbon migration in deep basins thickly sedimented continental margins. Overpressures influence sediment cohesion hence fault slip seismically active areas or failure on steep slopes, may drive catastrophic fluid expulsion. They also represent a significant drilling hazard. Here, we present method calculate the pore pressure due disequilibrium compaction. Our provides an estimate of compaction factor, surface porosity sedimentation rate each layer column using decompaction model constraints imposed by seismic data geological observations. For range porosities, ad hoc iterative equation determines factor that gives calculated thickness matches observed within tolerance. The then used obtain density profile corresponding P-wave velocity (Vp). selected parameters those give good match with both thicknesses Vp profiles. We apply our centre Eastern Black Sea Basin (EBSB), where have been linked low-velocity zone (LVZ) at ca. 5500–8500 m depth. These were generated relatively high 0.28 ka?1 low permeability organic-rich Maikop formation 33.9–20.5 Ma even higher 0.85 13–11 Ma. maximum 138 MPa 8285 depth, associated ratio overpressure vertical effective stress hydrostatic conditions (inline image) 0.7. values lower than presented previous study for same area.