Study And Application Of Geological Modeling Of Y54Well Field In Yuancheng Oilfield

Y54exploration area of Yuancheng oil field whose main oil-bearing formations areYan10and Chang1formations lies in the southwest of Northern Shanbei Slope,OrdosBasin.There are many problems of Chang1formation,such as water injection wells have beeninjected water with high pressure for a long time,a part of water injection wells did not meetthe requirements of geological condition,reservoir energy did not get the supplementeffectively,the foundation of stable production gradually becomes poor.Yan10formation is inearly development phase now,it was exploited by natural energy,formation pressuremaintenance level gradually becomes low.Now,producing wells have came into high waterstage.Therefore,in order to carry out the further work of reservoir numericalsimulation,describing finely reservoir,building reliable three-dimensional geological modeland predicting the distribution of remaining oil,which lay a solid foundation,it is of greatsignificance to draw up reasonable oilfield development plan lately.This paper takes Chang1and Yan10formations of Y54well field as study objects.FirstChang1formation was divided into two sub-groups11and12,Yan10formation was dividedinto two sub-groups101and102,which based on index bed,sedimentary cycle and lithofaciesthickness method;Secondly,the sedimentary distribution and evolution law of each sub-groupsare studied through the analysis of single well core,well logging facies and single wellfacies.Thirdly,the four-relationship of the Chang1and Yan10formations are studied with testoil result and geological parameter from core data.The logging parameter interpretationmodels are established by geological condition control.Based on these interpretationmodels,the author processes the logging data and interprets68wells in this regioncomprehensively.Then the macroscopic and the microscopic characteristics of Chang1andYan10are described by the combination of various data from the core assay.With the studyabove,the author uses geostatistics for guilding theory and chooses the modeling methodswhich suit the geological characteristic in this area.Also the author sets up reservoirgeological models of Chang1and Yan10formations,which include structuralmodel,sedimentary facies model and physical property(porosity、permeability、oil saturation)model with modeling software of Petrel.Through the reliability analysis of geological models,the result shows that the reasonable prediction results are consistent to geologicalknowledge in this area.Finally,the geological models could provide the distribution ofremaining oil and the favorable area prospecting.