Reservoir Characterrsistrcs of Chang 6 of Yanchang Formation (Triassic) in Dongkeng-shiwan Area,Ordos Basin

The pore structure character of Chang 6 reservoir was analyzed by studying the effect of lithology,pore types and clay minerals on pore structure.It discloses the main characteristics of reservoir microproperty.This study provides basis for further exploration and development in this area.Effect shows that,as delta front facies deposition,Chang 6 reservior presents low mineralogic maturity and high texture maturity,low to moderate porosity and low permeahility;its pore structure includes primary inter- granular pore,intergranular dissolved pore and intragranular dissolved pore.Diagenesis,granularity and shale content have main effect on pore structure.Sedimentary micro-facies control granularity and shale content.So the sedimentary microfacies of the reservoirs in this area must be intensified.