ANALYSIS ON CHARACTERISTICS OF DEEP-WATER SEDIMENTARY TIGHT SANDSTONE RESERVOIR OF CHANG 6 IN HUAQING AREA
The sedimentary characteristics,lithology characteristics,porosity-permeability characteristics,diagenesis types,pore texture and pore types of the reservoir of the Change 6 formation in Huaqing area are studied through analyzing the core,thin sections,casting thin sections and physical property.The result indicates that the deep-water sedimentary sandstone reservoir of Chang 6 formation has the following characters-ultrafined grain size of the deposits,low comparative maturity and moderated textural maturity,the pore types include residual interparticle pores,and secondary dissolution pore.The pore structure is mainly composed by the micropore fine-throat type.Between porosity and permeability of the investigated area,there are good positive correlations.It is a typical reservoir from low pore,low osmosis to extra low pore,extra low osmosis.