萨北油田北二西区点坝内部侧积层定量表征

萨北油田北二西区萨Ⅱ1+2b小层层内非均质性强,剩余油分散。本文依据研究区的地质特征和沉积环境,认为该区点坝内部侧积层的坝面分布为水平斜列式,分布形态呈"缓-陡"模式。基于研究区的密井网资料,在点坝内部侧积层分布模式的指导下,利用经验公式、岩心以及密井网剖面的方法对点坝内部侧积层进行了定量表征。得出研究区位于点坝顶部的侧积层倾角多在5°以内,而位于点坝中部的侧积层角度在4~10°之间,侧积层间距为40m,单一侧积体水平宽度约70m。以这些参数为基础,结合研究区侧积层的"缓-陡"模式,建立了能够用于油藏数值模拟的三维构型模型,分析了侧积层控制的剩余油分布模式,为厚油层剩余油挖潜提供了更准确的地质依据。

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.