Abstract
A simulation device of thermal degradation under high temperature-high pressure that is inforced by steam is developed by tLe authors.The test results of three samples （sapropelic kerogen, brown coal, crude oil） are describes in this article. It is proved that the pressure has little influence on R, H/C and δC-value of the samples' residual, but has much influence on the composation of thermal degradation products. When the temperature is more than 500℃,the data collected in the test may not be reliable due to the water-gas reaction.
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