Fluvial deposition and evolution of Yan 9 oilbearing interval of the Middle Jurassic Yanan Formation in Huachi area， Ordos Basin
李凤杰王多云刘自亮王峰
JOURNAL OF PALAEOGEOGRAPHY . 2009, (3): 275 -183 .  DOI: 10.7605/gdlxb.2009.03.003