CHARACTERISTICS OF GEOCHEMICAL PARAMETERS OF COAL MEASURES SOURCE ROCK IN THE THERMAL SIMULATION EXPERIMENT

With pyrolysis experiment, we extracted and analyzed the soluble organic matter from original samples of hydrocarbon source rock of Jurassic coal measures in Zhungeer basin and residual of different temperature, treated residual kerogen, measured R \-o and TOC, and gave chromatograph and mass spectrograph test to some sample series The results indicate that there is some geological and geochemical difference of hydrocarbon source rock of coal measures at different thermal evolution stage, natural gas generated at low evolution stage and thermal degradation stage is the result of different thermodynamic conditions and chemical reaction of mother matter of gas generation At low evolution stage, the vitrinite reflectance of source rock does not increase much, usually R \-o0 7% The analytical results of soluble organic matter of original samples and residue in pyrolysis experiment indicate that hydrocarbon gas is mainly from releasing of radicals of original soluble organic matter and thermal degradation of marginal hydrocarbon (polar component) of large\|molecule bitumen and kerogen At thermal degradation\|thermal cracking stage, the temperature of hydrocarbon source rock increases following the increase of buried depth, and thermal evolution relatively accelerates, the vitrinite reflectance increases from 0 55%~0 70% to 1 40%~1 70% quickly, at the same time, the thermodynamic effect is big enough to destroy the constitutional hydrocarbon of kerogen to generate oil and gas, it is the time of kerogen to release a lot of hydrocarbon Geochemical parameters at this stage show properties of thermal degraded constitutional hydrocarbon of kerogen