Research On Shasan3 Group Reservoir Characteristics In Banshen51 Fault Block

This research study,on the basis of comprehensive utilization of well logging,logging core and reservoir dynamic data,using the theory of Sequence stratigraphy,Sedimentary petrography,Reservoir geology,Petroleum geology,completed Fine stratigraphic contrast and division,Study on sedimentary microfacies,fan-delta front of Reservoir configuration,Reservoir heterogeneity.With the dynamic production data,it analyzes the effects of the reservoir characteristics on the development of the oil field,and it guides the adjustment to the spacing of the well spacing in the later stage of development.Through careful stratigraphic division and correlation,38 Wells completed 8 small layers,17 the single sand body reservoir contrast;The subfacies of fan delta front in the study area is divided into underwater distributary channel(between),channel flank,mouth bar,far sand dam and lake basin mud five microfacies.Compiled Es33 oil group 10 main sedimentary microfacies plane figure.Based on the study of sedimentary microfacies,the three-level structural units are subdivided to identify five types of three-level structural units: a single distributary channel,a single estuary dam,a single far-sand dam and a single channel flank.According to the experimental data of mercury injection,the pore type of the study area is mainly secondary intergranular pore,and the pore roar type is low-permeability throat ~ ultra-low permeability micro-throat reservoir.The porosity is mainly distributed in the 15~25% interval,and the permeability is concentrated in the interval of 0.5~50x10-3 belonging to the medium-pore low-permeability ~ ultra-low permeability reservoir.Estuary dam and underwater distributary channel has relatively good physical properties,which is generally characterized by medium-porosity and low-permeability,and is a relatively high quality reservoir.It's clear that the surface of the reservoir surface is controlled by the sedimentation,and the surface of the plane is shown to be a fan,and the layers are not homogenous and non-homogenous.According to a single distribution channel and a single mouth bar sand body width between 220~ 500 m,so suggest 220 m as a reasonable well spacing of the district.