Characteristics of multi-source petroleum systems in Sichuan basin

Analysis of petroleum system in the composite petroliferous basin must be integrated with analyses on the basin evolution, multicycle tectonic-sedimentation the basin underwent and basin type, heat mechanism of hydrocarbon forming, and geological elements of petroleum system, clearly indicating the distribution and evolution of each petroleum system in the basin. The characteristics of mutli-source petroleum system mainly include several source kitchens piled up completely or partly and shared the common migration paths and same cap rocks. Some critical moments were in the same period, some of them were not. Paleo-uplifts are favorable area for hydrocarbon early accumulation in multi-source petroleum system.