Well Logging Interpretation Of The Second Member Reservoir Of Jiaowei Formation In Weizhou 11-1 Oilfield

For weizhou area caused by the low resistance reservoir logging fluid identification is difficult,and with a primary development well,horizontal well log interpretation of horizontal well technique is weak,the vertical low resistance oil layer,on the basis of logging reservoir evaluation,interprete and verificate the result of the horizontal well logging.For vertical Wells in logging interpretation,firstly select the high resolution logging series and combined with core scale logging method to deal with curve so as to eliminate the influence of the thin layer,making clear to the changes of different sedimentary microfacies,microfacies parameter interpretation model is established,through inspecting porosity,permeability calculation value relative error with core analysis data up to the standard,Around Wei Zhou 11-1 oilfield complicated problem,Successively from vertical Wells,horizontal Wells,from the causes of low resistance oil layer,through a large number of experimental data,the low resistivity oil layer is mainly composed of clay additional conductivity,cation exchange capacity and high bound water saturation and other factors.Finding the method in identifying the low resistance reservoir,proposing△SP/△R_Xoo and M2RX crossplot,△GR×△R_Xoo and R_waa crossplot、S_wi-R_waa crossplot.Determine the low resistivity reservoir identification standard.The interpretation result and the actual production of coincidence rate was 86.5%.For horizontal well logging interpretation,because of the special wellbore trajectory,well logging curve is easily influenced by the degree of mud invasion,anisotropy,layer thickness,a variety of factors interference of surrounding rock.Use the calculation formula and standard chart of resistivity curve to correct.According to the common logging curves in different response characteristics of formation interface,Combined with horizontal well track and strata relations,determining the key stratum interface,and applies a high resolution processing on the horizontal well logging curve,to better identify the interlayer for horizontal well has carried on the fine reservoir characterization.For the reservoir with unified oil-water interface,Adopting oil-water interface method for horizontal well fluid identification,While for oil-water transition zone based on vertical Wells fluid interpretation standards,Combiningwell track and the position relationship between reservoir fluid identification of horizontal well,the interpretation conclusion and production coincidence rate was 90%.