Pyrolysis parameter S

1

(content of free hydrocarbon) and chloroform-extractable bitumen "A" are often used to reflect oil content during shale oil resource assessment.However

due to inherent flaws of experimental procedures

laboratory-measured S

1

values fail to truthfully record the loss of light (bitumen "A" only) and heavy hydrocarbons and the measured bitumen "A" values cannot truthfully record the loss of light hydrocarbons.In order to be more accurate in quantitative assessment of oil shale resources

we performed correlation of these parameters to mend up the losses based on analyses of hydrocarbon genesis kinetics of organic matter and comparison of the parameters before and after extraction experiments on samples from mudstone/shale of the Qingshankou Formation in Songliao Basin.The results show that the correlated average S

1

and bitumen "A" are 4.2 and 1.2 times higher than the measured average ones

respectively.The S

1

equals to bitumen "A" after correction

while the former is only 0.28 times the value of the latter before correction.This indicates the necessity of correction to the two parameters in the resource assessment.