The study on hydrocarbon generation histories in Kuqa depression using the method of kinetics

On the basis of the kinetic parameters of source rocks,with the combination of the data of sedimentary burial and paleo-thermal histories,hydrocarbon generation histories of Triassic-Jurassic source rocks in Kuqa Depression,Tarim Basin were studied using the method of kinetics in this paper.It demonstrated that Triassic-Jurassic source rocks(e.g.coal and mudstone) in Kuqa Depression generated gas relatively later,which mainly occurred at the late stage of Himalayan Period(after 10 Ma) and main gas peak was in the last 5 Ma.The gas generation time and main gas peak of the Middle and Upper Triassic source rocks were slightly earlier than those of the Middle and Lower Jurassic coal-bearing source rocks.The characteristics of late gas generation would provide the favorable hydrocarbon source for the late accumulation of natural gas in Kuqa Depression.