Study on the standard of the four relationships of reservoir and the lower limit of effective reservoir in Nantun Formation of Oilfield A

By using the data of logging, cuttings thin section identification and analysis in study area to four characteristics Nantun Formation reservoir their relationship, lower limit standard effective physical property is established by logging interpretation model mud content, porosity, permeability saturation, mercury injection method, oil production test method cumulative frequency statistics method. The electrical determined fluid chart. results show that lithology second member mainly sandy conglomerate, first sandstone, sandstone more developed. content full oil, spots stains. porosity between 4~20% 0.01~100 mD, showing low permeability. 7%, 0.05mD, sonic time difference 63μs/ft, density 2.55 g/cm3 water saturation 20%.