1. A method to couple fluid-flow model and geomechanical model for integrated petroleum systems, comprising: analyzing historical data associated with a reservoir to determine one or more triggering events that trigger abrupt changes in a state of stress of the reservoir solid framework and in pore pressure; defining one or more time steps based on the determined triggering events; coupling, by a processor, the fluid-flow model and the geomechanical model at the one or more defined time steps; and calculating automatically a number of iterations for the coupling to converge.