Kinetics of Natural Gas Generation of Mandong 1 Gas Pool in Tarim Basin

A pyrolysis experiment of gas generation of Hade crude oil sample from Tarim Basin was carried out with closed-gold tube-high pressure reaction system.The kinetic parameters of gaseous hydrocarbon generation were also obtained.The results indicate that Hade crude oil could yield a large amount of gaseous hydrocarbon.When pyrolysis temperature was 600.6℃in heating rate of 2℃/h,the yield of C1-5could reach 599ml/g.The kinetic parameters of C1-5 generation from Hade crude oil were as follows:activation energy distribution is 59～70kcal/mol,which is distributed between 60～65kcal/mol.Its frequency factor was 5.0×1014s-1.Based on the kinetic modeling of gas generation by using the kinetics(2000)software,in combination with the geological background,it was suggested that natural gas of the Mandong 1Gas Pool in Tarim Basin had the characteristics of oil cracking gas.The result demonstrates that oil-cracking occurs between the top of Cambrian and bottom of Ordovician,oil is cracked with a large amount in early time and generates a huge number of natural gas.The Mandong 1Gas Pool IS believed to be an accumulation of gases resulted from crude oil cracking.