Accumulation conditions and exploration directions of Ordovician lower assemblage natural gas, Ordos Basin, NW China

XU Wanglin,LI Jianzhong,LIU Xinshe,LI Ningxi,ZHANG Caili,ZHANG Yueqiao,FU Ling,BAI Ying,HUANG Zhengliang,GAO Jianrong,SUN Yuanshi,SONG Wei

Fig. 3. Variation in the gas carbon isotopic composition of methane and ethane with the thermal evolution during thermal simulation in gold tubes.