Reservoir Evaluation And Favourable Regions Prediction Of Chang 6 Member In QingPingchuan Oil Production Plant

The present make full use of logging data,the core sample analysis test data of target area,I finished small layer division and contrast of 296 wells,identify sedimentary microfacies and Analysis on sedimentary microfacies and sandbody distribution patterns.Using thin section identification,property of core analysis,high-pressure mercury injection and scanning electron microscope analysis data.Focus on the development of reservoir macroscopic and microscopic characteristics,established a reservoir classification evaluation standard,and divided into small layers of reservoir evaluation.Based on the above research,reservoir evaluation of Chang 6 in Qing Pingchuan is displayed.According to the reservoir characteristics and the main controlling factors of the reservoir formation,and summarized regularity of oil distribution of Qing Pingchuan,filted out the favourable oil and gas zone.The study shows that:Chang 6 reservoir strata changes unconspicuous,which can be subdivided into Chang 6₁?Chang 6₂?Chang 6₃ and Chang 6₄,The top layer structure is presented the characteristics of high-east and low-west.The Chang 6 developed delta front-delta plain system,further can be divided into distributary channel?interdistributary bay?underwater distributary channel and underwater interdistributary bay.The main reservoir rock types are arkose and lithic arkose,the pore type is mainly primary intergranular pore and dissolution pore,feldspar dissolved pores particularly development.The average porosity of Chang 6 reservoir is 7.56%,and average permeability is 0.86×10^-3?m²,Belongs to especially low porosity and low permeability reservoir.Mainly according to the lithology,sedimentary microfacies,physical properties,pore structure parameters,Chang 6 reservoir can be divided into four categories.The results show that,III and IV reservoir accounts for a larger proportion in Chang 6,class II reservoirs are relatively small,class I reservoir has been developed in Chang 6₁ and Chang 6₂ layer.Based on the characteristics of oil reservoirs and the control factors analysis of oil enrichment,this paper provides favourable areas of Chang 6 reservior,which consist two type?areas,five type?areas and seven type ?areas,provide the geological basis for the further exploration of oil fields development.