Quantitative characterization of laterally accretionary beds within the point bars in West II district of the Sabei Oil Field, Daqing placanticline

The SaII 1 + 2b layers from the West II district of the Sabei Oil Field are typical of highly heterogeneity and dispersion of residual oil. The laterally accretionary beds within the point bars in the study area are horizontally aligned and display the "gentle-steep" patterns. The quantitative characterization of laterally accretionary beds within the point bars are determined on the basis of empirical formula, cores and dense well section data. The results of research in this study show that the dip angles of laterally accretionary beds are less than 5° for the top of the point bars, and range between 4° to 10° for the middle part of the point bars. The space between the laterally accretionary beds is about 40 m, and the width of a single laterally accretionary body is about 70 m. The integration of above-mentioned parameters and "gentle-steep" patterns results in the construction of 3D model for the numerical simulation of oil reservoirs. The model for residual oil in this study may provide relatively accurate geological information for the exploration and development of residual oil within thick oil reservoirs.