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
Petroleum Exploration and Development . 2021, (3): 549 -561 .  DOI: 10.11698/PED.2021.03.10