关键词: 脉冲中子测井, 含水率, 含油饱和度, 沉积相, 剩余油分布, 四维模型, 随机建模

Abstract: The sedimentary facies and reservoir heterogeneity are the main control factors for the distribution of remaining oil.Taking N reservoir of M Oilfield as an example,the variation of oil saturation in the development of oilfield was analyzed.Two methods for calculating remaining oil saturation of oilfield including the pulse neutron lifetime log and the production profile log were investigated.The calculation method of oil saturation at different time in development stage was proposed.The sedimentary facies were taken as the control condition,and the random modeling method was used to establish four-dimensional model for studying the distribution of remaining oil in different development stage according to the chronological order.Some measurements such as subdivision of reservoir,killing formation and water block-off,re-perforation were applied in the objective oilfield.The better economic results were obtained.The production practice proved that it was available to develop four-dimensional model of remaining oil distribution under the control of reservoir sedimentary facies using the new method.

Key words: pulse neutron lifetime log, water cut, oil saturation, sedimentary facies, remaining oil distribution, four-dimension model, random modeling