Reservoir Geological Modeling Of The T? Formation In Lunnan 2 Oilfield

The reservoir of T?Formation in Lunnan 2 Oilfield belongs to the braided river delta front sub-facies.Subsea distributary channel sandbodies are in the majority of its front sub-facies.But other microfacies are less developed.This sedimentary feature leads to large reservoir thickness,high ratio between sandstone and stratum thickness.But sandstones formed by different reasons and periods make them complex in reservoir structure and strong in heterogeneity due to their physical properties.This really increases the difficulty of the development of residual oil.In order to improve the development efficiency,it is an urgent need for Lunnan Oilfield to deepen the geological cognitions of its structure,sedimentary,reservoir characters and oil and gas distribution,and then integrate them into a set of digital model.In this paper,the preparation of modeling consists of the following several aspects.Firstly,we accomplished the isochronal stratigraphic framework on the basis of stratigraphic correlation of T?Formation by the integration of well-logging and seismic data.Secondly,we finished the analysis of the spatial distribution of microfacies based on core facies,logging facies and seismic facies marks.Thirdly,we analyzed the influence factors of reservoir's physical properties according to its characters.At last,we completed a series of models as follow: 1)the structure model on the basis of the results of stratigraphy correlation,structure analysis;2)the lithology model,which was restricted by well-logging and constrained by seismic inversion,by the method of Sequential Gaussian Simulation in the framework of structure model;3)the lith-cotrolled microfacies model by the method of Sequential Indicator Simulation.And the microfacies-controlled reservoir attributes models,which were chosen from models established by the methods of both Co-kriging and Collaborative Sequential Gaussian Simulation.It is practically proved that the reservoir modeling methods and technologies we used are appropriate and effective for the targets of adjusting development plan and improving the status quo of injection and production.