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Ganguyi oil field is located in the Northern Slopes in the Ordos Basin, Triassic Upper of the Chang 6 oil group for the area one of the main producing formation. My paper is aimed to research Chang 6 reservoir of the exploration area, using multidisciplinary knowledge, especially the method of fine reservoir description, studied the fine sedimentary facies, diagenesis, physical property characteristic and reservoir heterogeneity. made a reservoir comprehensive evaluation of Chang 6 reservoir, provided a reliable theoretical basis to the continued water flooding development.According to the marker bed and the sedimentary cycle, the Chang 6 reservoir group is divided into four sub-groups, 61, 62, 63, 64, in which the 61, 62sub-group is the main producing reservoir.In this paper, based on previous studies, the study area for further research, 61 sub-group is subdivided into 61-1, 61-2, 61-3 three small layer, and 62 sub-group is subdivided into 62-1, 62-2 two small layer.By subtle description of rock core and facieses analysis of well logging, this paper describes the Chang6 reservoir bed in Tang157 area reservoir detailedly. The deposition granulated substance body of under water distributaries channel is the Chang6 reservoirs mainly reservoirs. the residual mouth bar and front sheet sands is not development.The rock types of the reservoir consists mostly of celadon to gray fine-grained feldspathic sandstones, and a small amount of middle-fine grained sandstone with low compositional maturity, and higher texture maturity. Diagenesis mainly ranged from compaction, cementation, dissolution. average porosity of reservoir is 8.3%, average permeability is 0.82×10-3μm2, this shows that Chang 6 reservoir belongs to the low porosity, super low permeability reservoirs; by reservoir heterogeneity study found that the oil and gas distribution in both vertical plane and horizontal plane exist in varying degrees of imbalance; classifying and evaluating the Chang 6 reservoir comes to the conclusion that the main part of Chang 6 reservoir belongs to the low permeability,super-low permeability reservoir. Chang61-2 and Chang62-1are the main small layer.which have oil.
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