Kinetics of Hydrocarbon Generation for Jurassic Source Rocks and Application in Northern Qaidam Basin:Take Saishenteng Depression as an Example
柴北缘侏罗系烃源岩生烃动力学及其应用——以赛什腾凹陷为例

A pyrolysis experiment of gas generation of source rock sampling from Qaidam basin was carried out with a high pressure and closed gold tube reaction system.The kinetic parameters of gaseous hydrocarbon generation were also obtained.The results show that activation energy of CH4 ranges from 49kcal/mol to 67kcal/mol with two peaks of 57kcal/mol and 66kcal/mol in a diagram of activation energy distribution if its frequency factor of 1×1012/s is assumed.C1-5 activation energy ranges from 52kcal/mol to 66kcal/mol with a unique peak of 59kcal/mol in the diagram and its frequency factor of 1.10×1015/s.Based on gas generation history simulated by kinetics software and two artificial simulation wells at the centre of Saishenteng depression and its slope,it is suggested that the Lower Jurassic source rock in the central Saishiteng depression and its slope entered the gas generation threshold at 29.8Ma(RO is 0.67%) and 23.8Ma(RO is 0.87%),respectively.