Reservoir characteristics and genesis analysis of Lishuao area in Biyang sag

Through core observation,scanning electron microscopy(SEM),thin section identification,physical property,mercury injection data analysis of Lishuao area,the systematic research on reservoir physical properties and pore structure characteristics has been carried out.The main types ofthe reservoir sandstone in the area are of lithic arkose,rich feldspathic lithic sandstone,presenting complex lithology.From the lithology of coarser grit gravel,coarse sand to finer powder sandstone,all of oil-bearing characteristics.Reservoir pore type is given priority to primary intergranular pore,with a small grain of solution pores development,uneven pore throat sorting and separation of medium-poor,big pore throat ratio,low coordination number and poor pore connectivity.The medium reservoir porosity and permeability of the longitudinal difference is bigger,generally belonging to medium porosity,medium-low permeability reservoir,which mainly depends on the content source distance and of sedimentary facie,with stronger reservoir property in plane and vertical heterogeneity.