Pore structure research of Chang 6 reservoir in Huaqing area

Through application of rock-mineral analysis technology and high pressure mercury injection technology, the pore structure research of Chang 6 reservoir in Huaqing area has been carried out. The results indicate the sandstone types of the research area are mainly of lithic deldspar sandstone and feldspar lithic sandstone, with the characteristics of low compositional maturity and complex debris composition and filler content composition. The pore types are mainly of intergranular hole, feldspar dissolved pore and lithic dissolved hole, with bigger percent of area pores. The reservoirs are typical low porosity and low, ultra-low permeability, with good physical properties and medium-poor sorting. Generally, the pore structure has the characteristics of thin pore throat and regular pore shape.