LIU Dehan ),FU Jinhua ),ZHEN Congbin ),XIAO Xianming ),MI Jingkui ) ) The State Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou,) Research Institute of Changqing Oil Field, Xi''''an, ) Northwest University, Xi''''an,.2004. Research on Hydrocarbon Generation of Ordovician Marine Carbonatite of the Ordos Basin and Genesis of Changqing Gas Fields[J]. Acta Geologica Sinica,78(4):542-550