Abstract：The member Es1 of C9 block in CYT Oilfield is a major hydrocarbon containing target, which is mainly the fan delta front deposits. Based on core analysis, log interpretation, and sedimentary microfacies, we conduct a research on lithology characteristics, physical property and reservoir heterogeneity. The results show that the reservoir rock of C9 block is mostly quartz sandstone and reservoir physical property is a sandstone reservoir with medium-high pore and medium-high permeability. Affected by sediment source, physical property gradually become worse from northeast to southwest. The reservoir shows a strong heterogeneity according to the analysis of permeability variation coefficient, onrush coefficient, permeability differences. This study provides useful information for the future reservoir development.
