Genetic types and their relationship with oil-gas accumulation of the Lower and Middle Jurassic reservoirs in Ordos Basin, China

Based on the synthetic study of field outcrops, drilling section data, indoor drawn charts, and data of stratigraphic correlation, the authors discuss the relationship of the different sedimentary facies with oil-gas accumulation of the Lower and Middle Jurassic Fuxian Formation and Yan’an Formation in Ordos Basin. The result shows that the oil reservoir is closely related with palaeogormorphy and sedimentary facies. At the same time, the paper proposes that in future, people should select the margin of palaeogormphy and old stream channel, point bar and distributary channel as main exploration regions. In addition, people should also notice the reservoir of rudaceous rocks due to alluvial vallay on the surface of uncomformity.