Research Of Geologic Modeling And Residual Oil Distribution Of Wen 135 Block In Wenliu Region

The long-term development resulting complex relationship between oil and water,and seriously affecting the further adjustments tapping in Wen135 block.This project uses the theory of sequence stratigraphy,structural geology,sedimentology and petroleum geology as the theoretical guidance,through the computer technology to establish a fine geological model of the state of a real reservoir geology,using reservoir simulation method to complete the distribution of the residual oil reservoir simulation,and according to the distribution of the residual oil to work out adjustments to tap the potential to improve development efficiency measures.On the basis of reservoir division and correlation in Wen 135 block,cycle-thickness method and elevation method are used for fine reservoir division and correlation of the lower submember Es2₄ to upper Es3₃,divided into 48 thin layers,and built up a fine stratigraphic framework of the area.Based on drilling data,seismic interpretation results of the study area has carried on the fine structure research,and combined stratigraphic division and correlation of data packets to establish a structural model 135.On the basis of sedimentary microfacies combination in the logging responses,establishing correspondence relations between sedimentary facies and microfacies logging,divided and analyzed sedimentary microfacies.I drew the sandstone thickness maps and sandstone figure percentage maps of all sub layers,and analyze d the characteristic of the plane distribution of sedimentary facies.Logging interpretation is used to establish the relationship between sedimentary micro facies and properties.Constitute the main microfacies of the oil and gas reservoirs in this area are underwater distributary channel sand body,shore and shallow lake sedimentary and edge river deposition,etc.And finally on the structural model corresponding depositional model is established.Combined with single well oil and water interpretation result,stochastic modeling method is adopted to establish the lower submember Es2₄ to upper Es3₃ discrete attribute model such as sand mudstone model and fluid model.Phased modeling techniques was used to establish a porosity model,permeability model,oil saturation and net-to-gross model.Using the Eclipse 2006 numerical simulation technology to fitting the production history,quantitatively calculate the residual oil saturation.Wen 135 block residual oil is mainly corner type and inter well type,further tap adjustment is difficult,potato shaped reservoirs with low permeability and low rate of oil.Combined with dynamic analysis analyzed the residual oil distribution.Provides a good theoretical basis for improving the development efficiency of Wen 135 block.