A STUDY ON CHARACTERISTICS AND KINETICS OF CATALYTIC DEGRADATION FROM KEROGEN IN CARBONATE ROCKS
Zhao Guiyu1 Li Shuyuan2 Liu Luofu1(1.Key Laboratory for Hydrocarbon Accumulation Mechanism, Ministry of Education, University of Petroleum, Beijing 102249; 2.School of Chemical Engineering, University of Petroleum, Beijing 102249)
The effects of catalysts on hydrocarbon generation from kerogen, with the simulated samples being the Ordovician carbonate rocks from Pingliang area, Gansu province, NW China, were investigated by using simulation experiment and chemical catalysis mechanism. The catalytic action of different catalysts was studied on the product composition, hydrocarbon yield, kinetics of hydrocarbon generation, and so on. It is found that different catalysts might have different effects on hydrocarbon generation. In a situation of carbonate rocks existing, the yield of generated hydrocarbon S 2 decreased because of the adsorption of carbonate on pyrlysates. The insoluble salt, CaSO 4, as a catalyst, enhanced kerogen degradation to increase the yield of hydrocarbon (S 2). The soluble salts including CaCl 2 ,Na 2SO 4 and NaHCO 3 had few effects on the hydrocarbon generation from kerogen. As the kinetics was concerned, carbonate rocks had a negative catalytic effect and decreased the reaction rate, but CaSO 4 had a positive effect and gave rise to the reaction rate. In addition, it was also found that the kinetics parameters, apparent activation energy and frequency factor had a relationship with each other, which could be reasonably described by an exponential function.