A Method for Observation of Characteristics of Hydrocarbon Generation Materials in Electron Probe Thin Sections of Black Source Rock by the Reflected-light Viewing System of a Pola... oleh ZHENG Qing-hua, LIU Xing-jun, LIU Qiao, LIANG Xiu-ling, ZHANG Xiao-long, ZUO Qin, YANG Kai-yan, MA Ting, XU Feng