Reservoir diagenesis and physical propety influence factors of Chang 6 reservoir group upper triassic

Through the core observation of core wells and a large number of samples thin sections,scanning electron microscopy analysis of the Chang 6 reservoir,oil Ansai oilfield, the result shows that:(1)The main sandstone of the reservoir sandstone of Chang 6 oil,Ansai Oilfield is fine-grained arkose and lithic feldspathic sandstone,detrital feldspar-based, characteristics of low compositional maturity,high structure maturity.(2)The diagenesis which closely related to formation and evolution of pore,in this field including compaction, filling cementation and dissolution.(3)The sandstone pore type including intergranular dissolution pores,intragranular dissolved pores,micro cracks and intercrystal pore,ect.The frist two types are effective opening of the area.(4)Reservoir physical properties impact on depostion microfacies and diagenesis.Deposition determined the mineral composition and structure of the debris,and diagenesis can make its mineral composition and pore structure produces major change.