Influencing factors and characteristics of Chang 6 reservoir in Wuqi area,Ordos Basin

Based on the analysis of cast slice and petrophysics,the petrology characteristics,porosity and permeability,pore structure and pore types of Chang 6 reservoir in Wuqi area are studied,and its influencing factors are analyzed.The result shows that Chang 6 reservoir is characterized by low mineral maturity and high structure maturity,medium porosity and low permeability with intergranular pore and solution pore developed well.Medium pore and small pore are the main reservoir space.Fine throat and middle throat are the basic seepage passage.The reservoir property is closely related to both sedimentary microfacies and diagenesis.It is affected by sedimentary facies belt on plane,and made poor by compaction and cementation in vertical direction,however,improved by secondary pores caused by dissolution.