Computer modelling of the geologic evolution of the Carboniferous – Lower Permian Total Petroleum System enabled spatial reconstruction of hydrocarbon generation and migration in the Polish part of the Southern Permian Basin (SPB). As a result of the research, the authors established that the phase responsible for generation and migration of gas filling contemporary traps took place at the end of Late Triassic. Quantitative analysis based on the Schmoker method and modified differential mass balance method allowed to calculate undiscovered reserves of natural gas in the Rotliegend reservoir as equal to 1.49 x 1012 m3 (Burzewski et al., 2009). Taking into account the generation and migration processes intensity and timing, structural evolution, and petrophysical variability of reservoir rocks, favourable places of possible gas accumulation were indicated in the deeper zone of the investigated part of the basin.


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