Study On Remaining Oil Evaluation For Field V In Golombia

Field V in Columbia has been developed over 60 years with multilayer and high intensity production,which resulted in serious interlayer contradiction.This study is based on structure research,layers subdivision,reservoir research and reserves calculation,analyze the remaining oil distribution,quantitative oil enrichment potential region.The causes and the theoretical derivation were analyzed.It is important in achieving effective development the potential of remaining oil,improving development effect,enhancing oil recovery.The main results are as the following:1.To establish the stratigraphic division and layer subdivision scheme:correlation of sand zones of 296 wells and subdivision contrast of 162 wells in key blocks.Combined with the seismic research,to carry out fine structure interpretation,reservoir prediction,and the structural features was clearly established for the first time.2.With the core,test and logging data,to establish the interpretation standard of oil-water for the first time:Logging response in water flooded layer was charactered for different flooding level.296 wells logging interpretation were conducted by logging,geology,reservoir engineering analysis and comparative analysis between wells.3.With the comprehensive application of core analysis,logging data,core photos,the sedimentary model was establish;Single well microfacies,section analysis and hierarchical system of phase plane analysis was studied.4.Reservoir and the heterogeneity were studied in-depth,and focused on petrology,reservoir physical properties,pore structure characteristics,interlayer distribution and inner layer,interlayer and plane heterogeneity.Based on structural analysis,log interpretation,dynamic and static data,fault block wells through strata and hydrocarbon,oil water distribution characteristics of oil 11 zones and 15 layers were analyzed.Combined with the parameters of logging,geological reserves were calculated and analyzed the distribution.5.The reservoir characteristics,development process and problems were in-depth analyzed.Through the behavior of water cut,water flooding effect evaluation,energy evaluation,measures of effect analysis,to evaluate development effect;Through the study on the calibration of the recoverable reserves,production split,water flooded analysis,the remaining reserves evaluation to analyze the adjustment potential for each block and layer and put forward to the potential block and potential layers.6.Simulation was conducted in this field.Combination of reser,voir engineering analysis,to carry out the research of remaining oil distribution,determine the relation between residual oil distribution and the the sand body,provide a basis for development adjustment scheme.Finally the development adjustment suggestion is proposed.7.The control factors on the residual oil distribution were discussed.The micro structure in hydrostatic conditions is the main factor controlling the remaining oil distribution,but in the hydrodynamic conditions,micro structure and hydrodynamic intensity together control the remaining oil distribution...