光变可作为评价镜质体富氢类型的方法

PEOTOMETRIC CHANGES AS A METBOD TO EVALUATE THE HYDROGEN-RICH TYPES OF VITRINITES

根据对中国煤和烃源岩中镜质组光变详细的光度学分析结果，建立优质体光变特征与煤阶（成热度）和镜质体类型的相关关系，提出光变型式和幅度可作为评价镜质体富氢类型的新方法。石油窗或沥青化作用阶段富氢镜质体以明显正光变为特征，表现为荧光强度明显增高，荧光光诺向短波长“黄移”。富氢镜质体明显正光变与其中流动相含量较高有关。利用镜质体光变特征区分镜质体类型在炼焦配煤、煤和陆源有机质烃源岩评价和镜质体反射率抑制校正中都具有重要意义。

Based on the detailed photometric analytical results of vitrinite photometric changes in the coals and hydrocarbon source rocks of China,the interrelations of the characteristics ofvitrinite photometric changes and coal ranks(maturity)to vitrinite types are established,and the forms and ranges of photometric changes are suggested as a new method to evalu-ate the hydrogen-rich types of vitrinites. In oil windows or during the bituminizationstage, clear positive photometric changes are features of hydrogen-rich vitrinites, display-ing obvious increases of fluorescence intensity and “yellowward shift”of fluorescence spec-tra to short wavelength. The clear positive photometric changes of hydrogen-rich vitriniteshave something to do with the higher contents of flow facies among them. Using the fea-tures of vitrinite photometric changes to distinguish the types of vitrinites has importantsignificance in coking blend, the evaluation of hydrocarbon source rocks in coals and ter-rigenous orgnic mass and the restraint correction of vitrinite reflectance.