The Flow Units Research For C1and Y10Reservoir Of Y54Wellarea In YC Oilfield

Y54well area of YC oilfield is located in the West dipping monocline betweenYishan slope and Tianhuan depression in Ordos Basin. The main production horizonis Jurassic C1layer of YanChang formation and Triassic Y10layer of Yan’anformation.The development test for well area was launched in2000, May. Till2009,the proven geological reserves reached5.6×106t, which, in recent years, is one of thekey areas in terms of increasing development and production for ChangQing Branch.Therefore, the hydrocarbon flow unit study is carried out for C1and Y10reservoir ofY54wellarea in YC oilfield, thereby building up a solid foundation for thefollowing-up exploration.Thoughout the fine stratigraphic division and comparison on C1layer and Y10layer, along with the comprehensive analysis of single well facies, well-logging faciesand connected wells’ cross-section, combined with sedimentary microfacies evolutionand plane distribution features, it is dictated that C1reservoir is a delta plain, mainlydeveloped underwater distributary channel, floodplain, swamps as well as othermicrofacies; Y10reservoir mainly consists of rejoinder fluvial facies, along with acomposition of a series of riverbeds, dams, flood plains and other micro-phase relatedto river effect.According to the data collected from Laboratory analysis, logging data,production information and so on during coring, conducting the analysis on reservoirfour sexual relationships, physical lower limit and water-oil boundary identificationstandard, logging interpretation model is established, responsible for the secondaryprocessing and interpretation of67wells logging data in the whole region. Then, theoverall study on features of reservoir is in progress, where rock and mineralcharacteristics, microstructure characteristics, physical characteristics andheterogeneity characteristics are included. Based on the previous steps, SPSS softwareis applied, in which parameters such as porosity, permeability, flow zone indicator arebeing as variables, to run a cluster analysis for samples during coring. Then, on thebasis of performing a discriminant analysis for clustering results of coring, non-coring information can be detemined, along with hydrocarbon flow units being carved whichreport the reservior, seepage and other information as well. With the help of3Dvisualization technology and Petrel geological modeling software, to structural modelis established by using the interpolation method. Under the trend in the single wellsedimentary facies, sedimentary facies model is established by employing sequentialindicator stochastic simulation method. With the constraints on sedimentary faciesmodel, sequential Gaussian simulation method is utilized to create porosity andpermeability property model and to finally complete three-dimensional geologicalmodel for flow unit. At last, with employing the carved-out flow units, combined withproduction and oil testing data, delineation of favorable areas for the whole oil regionis executed. And as a result, five favorable oil zone are obtained, which lays afoundation for later potential reservoir development.