Ordos Basin, located in the middle-west of China, is a polycycle sedimentary basin after evolution for a long period. The central region of the basin is the main production area of Mesozoic petroleum accumulations, and Yanchang Formation characterized by low permeability, low porosity and well-developed fractures is the main pays. Based on the previous research, and with several methods such as field investigation, core observation, thin section analysis, logging data etc, features of sedimentation, reservoir and it\’s fractrures of the oil bearing series of Yanchang Fm., upper triassic, in the central region of the Ordos Basin are studied deeply.Reservoir mainly consists of feldspathic sandstone, feldspathic lithic sandstone in the central region. And diagenesis of it, including compaction, cementation, metasomatism and dissolution, primarily in middle stage of diagenetic A~B, during which fissure develops easily. Different types of pores, such as macro pores, micro pores, mixed pores, intergranular remainder pores and intergranular dissolved pores, have been composing the main room of oil

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