In the Transylvanian Basin have been discovered more than ninety gas fields. The gases consist only of biogenic methane reservoired in the Upper Badenian, Sarmatian and Lower Pliocene rocks. The almost all gas structures are dome-shaped and most of them are controlled by salt diapirism of different intensities that suggest more mechanisms of the salt movement. To study the salt flow and the formation of the gas structures we used a simple model considering an elastic plate overlying a viscous fluid. In this model the viscous fluid is the layer of Badenian salt and the elastic plate is represented by the overburden composed of Upper Miocene and Pliocene deposits. The model shows that the early stages of salt movement have been due to folding of the overburden during compression in the Uppermost Sarmatian and Pliocene compressive regime and dragged by the Sarmatian deltaic deposits. The salt buoyancy was the main mechanism in the later stage of diapirism. The results are in agreement with the geological evolution of the basin, gas generation and accumulation. <br>


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