AN EXPERIMENTAL SIMULATION ON THE HYDROCARBON QUANTITY GENERATED UNDER PRESSURE SUPPRESSION-A CASE STUDY FROM THE JIYANG DEPRESSION OF THE BOHAI BAY BASIN

Hydrocarbon generation is influenced by geologic settings such as temperature,pressure and so on.The process can be described in chemical kinetic models.Open-system and closed-system simulation experiments were used to study the kinetic characteristics of 4 kinds of main source rocks in the Ji-yang Depression,the Bohai Bay Basin.Vertical pressures equivalent to underground strata were taken into account in closed-system experiments.Some conclusions were made on the basis of the comparative analysis of the experiments.Pressure suppressed the hydrocarbon generation on different extents according to different source rocks and different evolutionary stages.With increase of the hydrocarbon generation potential of mother materials,the evolutionary degree or formation pressure,it was showed more suppression of hydrocarbon generation.The kinetic parameters of hydrocarbon generation of the source rocks related to different pressures were accordingly determined.