Reservoir Fine Modeling Study On Mingyi Fault Block Of Wenmingzhai Oil Field

Wenmingzhai Oilfield is located in the vicinity of Shen County the junction ofShandong province and Henan Province, and the majority of the oilfield is in ShenCounty. The construct of Wenmingzhai is a horst structure which is located in thenorthern of the central uplift of Dongpu Depression. Because of faults cutting, theWenmingzhai structure is very complex.This study first analyzes the characteristics of the geological structure of thestudy area. The faults of the study area are so many and dense, and the stratum isbroken, that it is only a cursory understand of the structural characteristics of thestudy area using the structural interpretation results of3D seismic data. Logging datais imported into the Petrel software, and by contrasting and analyzing each well logcurve, the formation is divided again. Then the existing hierarchical data is reviewedand complemented, then all the hierarchical data and breakpoint data of all wells withwell logs are gotten. Using these hierarchical data and breakpoint data, the originalconstruction plan is improved, and the top structure maps of main sand groups andconstructed profile maps are gotten.On the basis of structural studies, using Petrel software, this study established athree-dimensional structural model for the study area. First of all, well head data anddeviation data are using to determine the distribution of wells in the three-dimensionalspace. Secondly, this study generated a rough fault plane and the tectonic trendsurface by digitizing the structural map. Then, the fault point is using to fine-tune thefault plane, to establish the fault model, and on the basis of fault model, the gridsystem is determined. At last, a fine level model is established using well tops data,completing the three-dimensional structural model of the study area.According to the research of the sedimentary facies, on the basis of the structuralmodel, the sedimentary microfacies model is established. The research shows that it isterminal fan sedimentary system at lower strata Es2, and it is shallow delta depositional system at upper strata Es3. Through variogram analysis, choosing thetruncated Gaussian simulation method, being restricted by sedimentary facies limitsurface, this study establishes the three-dimensional sedimentary microfacies modelof the study area.On the basis of sedimentary facies model, using AC-POR formula, this studycalculated the porosity data of each well. Using POR-PERM formula, this studycalculated the permeability data of each well. Through variogram analysis, usingfacies-controlled modeling technology, choosing the sequential indicator simulationmethod, a porosity and permeability model is established.On the basis of the structural model, using the floor plan of effective thicknessand the oil saturation formula, this study establishes NTG model and oil saturationmodel of the study area. The model is verified by calculation of reserves, and can beused for the numerical simulation.