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Experimental study on effects of minerals on oil cracking

JIANG Lan-lan,PAN Chang-chunand LIU Jin-zhong(Guangzhou Institute of Geochemistry,Chinese Academy of Sciences,Guangzhou 510640,China)  
Oil cracking experiments were conducted in a confined system(gold capsules)in the presence and absence of minerals,i.e.,montmorillonite and calcite.Compared with the result of the experiment for oil alone,the amounts of methane and total hydrocarbon gases(C1-C5)are generally similar in most experimental temperature ranges,but relatively high in the high experimental temperatures in the experiment for oil plus montmorillonite,demonstrating the catalytic effect of montmorillonite on oil cracking.However,they are relatively low in most experimental temperature ranges,and substantially low in the high experimental temperatures in the experiment for oil plus calcite,indicating the inhibitive effect of calcite on oil cracking.The relative concentrations of iso-alkanes and gaseous olefins are similar between the experiments for oil alone and oil plus calcite,but they are substantially higher in the experiment for oil plus montmorillonite than the other two experiments.Based on the data of oil cracking at the heating rates of 2 ℃/h and 20 ℃/h,kinetic parameters for the generation of methane and total gaseous hydrocarbons were modeled using the KINETICS software developed by LLNL,USA.The results were used to estimate the temperatures of the main stage of oil cracking under geological condition.
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