Reservoir Evaluation And Favourable Regions Prediction Of Chang 6 Member Of Wangyao Tract In Ansai Oilfiled

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 223 wells of study area,analysis on sedimentary microfacies and sandbody distribution patterns.Using thin section identification,high-pressure mercury injection and scanning electron microscope analysis data,Focus on the development of reservoir macroscopic and microscopic characteristics.establish ed a reservoir classification evaluation standard and displayed reservoir evaluation of the non-active layers of Chang 6 in WangYao.According to the reservoir characteristics and the main controlling factors of the reservoir formation,and summarized regularity of oil distribution of WangYao,filted out the favourable oil and gas zone.The study shows that:Chang 6 reservoir strata changes unconspicuous,the top layer structure is presented the characteristics of high-east and low-west.The Chang 6 developed delta front system,further can be divided into underwater distributary channel,interdistributary bay,estuary dam etc.The main reservoir rock types are arkose,the pore type is mainly primary intergranular pore and dissolution pore.The average porosity of reservoir is 11%,and average permeability is 0.78�10-3?m2,Belongs to especially low porosity and low permeability reservoir.Analysis of main factors affectiing the reservoir physical property are sedimentation and diagenesis.According to the lithology,sedimentary microfacies,physical properties,pore structure parameters,the non-active layers of Chang 6 reservoir can be divided into four categories.The results show that,? and ? reservoir accounts for a larger proportion in the non-active layers of Chang 6.Based on the characteristics of oil reservoirs and the control factors analysis of oil enrichment,this paper provides favourable areas of the non-active layers of Chang 6 reservior,which consist three type I areas,eight type ? areas and seven type ? areas,provide the geological basis for the further exploration of oil fields development.