Study Of Reservoir Logging Evaluation Of E₃²Reservoir In GS Oilfield

It is generally believed that E₃²reservoir of the GS oilfield which presentscontinental sedimentary structure lithologic is a self-generated and self-storage model.It is due to the complicated geological conditions and multi-stage tectonic movementsin this area that a very complex stress system came into being.While planedistribution law of this reservoir remains unimplemented, characteristics of reservoir,which was provided with serious heterogeneity, complex reservoir types, uncertaintyphysical parameters and difficulty fluid discrimination, are not clear. In this article,basing on core analysis, oil testing, test mining as well as other first-hand information,we make full use of existing data to create a reliable reservoir parameterscomputational model under conditions of geological setting. Then with multi-wellprocessing, the study of classification standard on effective thickness can beconducted on the basis of four-property relationship. According to data from welltesting and production testing and the reservoir parameters calculated by the logging,It is easy to establish standards of this area for identifying oil-water layer. In the end,comprehensive evaluation to E₃²reservoir can be carried on, relying on evaluationmethod of reservoir single factor and reservoir characteristics which containheterogeneity, parameters distribution and oil-water distribution.First of all, depending on reservoir lithology, physical, electrical, oilcharacteristics and four-property relationship, we can set up a logging interpretationmodel, utilizing cross plot between log data and core data. Secondly, we takegeological inspection among the key wells for calculating reservoir parameters.Thirdly, combining with information from well testing and production testing, platebetween oil saturation and porosity, plate between the acoustic time and inductionresistivity, plate between deep lateral or deep induction and neutron logging, we cancreate criterion suitable for the area for identifying oil-water layer, which can be usedfor fluid discrimination and log fine Interpretation.Secondly, the study of the heterogeneity in target area indicates that the mainoil-producing layer is relatively weak heterogeneity in the vertical, however the strong heterogeneity area in the plane distributes on the side parts of the structure where thelithology changes quickly and the north-south strip distribution is parallel to the axisof the structure. The distribution of heterogeneity has influence on the properties ofthe reservoir. The distribution features of lithological parameter, physical parametersand oil parameter in the plane show that the better area of logging reservoirparameters controlled by the structure is north-south distribution along the crest of thestructure. Reservoir sections show that the distribution of oil and water is mainlyinfluenced by structure, water in the low parts of the structure; in the contrary,oil inthe high parts of the structure. At the same time lithology has some influence on thedistribution of oil and water.Finally, combining distribution features of heterogeneity and reservoir parameterswith single factor evaluation which is according to storage coefficient, formationcoefficient and flow unit index evaluate E₃²reservoir and classify it to four categories.