Equivalent Characterization And Three-dimensional Geological Model Of Reservoir Heterogeneity

By a variety of data, such as cored well core data, logging data, seismic data and so on, reservoir causes and characteristics, reservoir heterogeneity, heterogeneous reservoirs equivalent characterization, three dimensional geological model are studied. The results reveal, southwest direction is mainly area source direction, sedimentary facies type is shallow water deltaic, identify six microfacies which are subdivided into 12 energy units. Rhythm types are divided into positive rhythm, reverse rhythm, homogeneous rhythm and composite rhythm. Grain size rhythm and permeability rhythm are mainly positive rhythm. Establish interlayer identification standard by core calibration logs, identify totally inner layer sandwich 874, inner layer sandwich is not developed on plane, most of sandwich distribute like potato, poor continuity. From main river- first category of river- second category of river- Other microfacies, inner layer sandwich frequency and density increased, heterogeneity gradually. Three oil group totally identify six relatively stable spacing layer, three key oil group are divided into 7 sands development section. By sandstone thickness, effective sandstone thickness, porosity, permeability plane contour maps, reservoir plane heterogeneity is studied, different microfacies have significant difference, distributary channel microfacies have large sandstone thickness and good physical property, which is more favorable microfacies.The study find that, lateral mesh step coarsening to 40 m or more, vertical grid step coarsening to 4m or more, the cumulative oil production, water production and recovery have large error. Lateral mesh step is less than 40 m, vertical grid step is less than 4m, model is roughly equivalent to original model, simulated reservoir do not change too much. Build three oil group structure stratigraphic framework model, 27 small layer sedimentary facies model are established by deterministic modeling, porosity and permeability properties model of 27 small layer are established by sequential Gaussian random algorithm, which provides a three dimensional perspective and more basis for reservoir characteristics and heterogeneity fine study.