Chemical Kinetics Application of Hydrocarbon Generation of Upper Permian Dalong Stratum in the Northeastern Sichuan Basin

To determine hydrocarbon source rock characteristics of Dalong stratum in the northeastern Sichuan Basin,it is selected dark mudstone in Kuangshanliang of Guangyuan to launch Rock-Eval(open system) thermal simulation,and Brass instrument thermal simulation(closed system) is done e to determine the gas characteristics cracking from crude Generation by Dalong Stratum and Migration into Feixianguan Stratum.Through thermal simulation data to demarcate a kinetic model,the Dalong Stratum mudstone samples reveal the kinetic parameters of activation energy is mainly distributed in(190—230) kJ/mol),the average activation energy is 212 kJ/mol.Oil and gas generation history indicates that the considerable hydrocarbon generation geological time around 210 Ma to 170 Ma(Middle Jurassic),and basically get termination hydrocarbon generation after 170 Ma(Middle Jurassic),oil cracking gas occurs mainly in the period(180—160) Ma.Kaijiang-Liangping trough and Guangyuan-wangcang average gas intensity strength is(10—20×10~8) m~3·km~2 in Dalong stratum Northeast Sichuan Basin,Dalong stratum source rocks accumulated gas reached 32.63×10~(12)m~3.Oil and gas generation history is short and late of Dalong Stratum source rocks,made great contributions to the accumulation.