Comprehensive classification and evaluation of low permeability reservoirs

Low permeability reservoirs are classified and evaluated by taking Pucheng oilfield as an example. According to evaluation standards and the main parameters, the reservoirs are divided into 6 types, including ordinary low permeability reservoirs, ultra - low permeability reservoirs, tight reservoirs, very tight reservoirs and fractured - porous reservoirs. It provides scientific basis for further understanding internal structure of oil layers, rationally developing oilfield and enhancing ultimate recovery factor.