RELATIONSHIP BETWEEN PRESERVED STATES OF KEROGEN AND MATURITY

The method of coal- petrology- study and some new measurement technologies such as vitrinite reflectance, DTA-DSC thermal analysis and pulse element analysis , ect. As indicatores in this paper are used to distinguish and divide the evolution stage of coal and kerogen. The author attempts to demonstrate that each evolution parameter of kerogen preserved in different rocks is approximate but an equal by making comprehensive studies of organic geochemical information . from sections of two drilling-wells. The facts prove that each evolution perameter of type Ⅲ dispersed kerogen is lower one or half coal rank than that of mimic coal in the same drilling section and burial depth. The result also proves that the parameter of coal kerogen is larger than that of dispersed kerogen in shale which is larger than that of in mud stone which is larger than that of in sandstone. The samples are in the approximately strata depth of the same drilling section. The above diversity may be caused by the difference of kerogen preserving state of kerogen, thermal conductivity of source rock, coefficient of heat gather and radiation.