利用测井解释渗透率获取拟毛管压力曲线的方法及其应用

摘要

通过集成应用不同学者研究成果,得到了一种依据取心井岩心压汞分析数据并利用测井解释渗透率重构拟毛管压力曲线的方法,并将该方法应用于渤海NB油田,重构的拟毛管压力曲线与实测毛管压力曲线相关性较好.渤海CF油田储层岩性复杂,利用常规方法计算的地层含烃饱和度误差较大,于是利用重构的拟毛管压力曲线计算地层含烃饱和度,所得结果较为准确.利用拟毛管压力曲线计算地层含烃饱和度的方法原理与J函数法相同,但其充分考虑了砂体内非均质性及不同深度处距离油水界面远近的影响,并且不受地层电阻率的影响,因此计算结果更为准确.%By integrating the results from various researchers, a method to reconstruct pseudo-capillary pressure curves based on core mercury-intrusion data and by using log-interpreted permeability has been developed. In NB oilfield in Bohai Sea, the reconstructed pseudo-capillary pressure curves by this method are in quite good correlation with the measured capillary pressure curves on cores. In CF oilfield in Bohai Sea, there are greater errors in calculating hydrocarbon saturation by the conventional method due to its complicated lithology, and the reconstructed pseudo-capillary pressure curves were applied to calculate hydrocarbon saturation, resulting in more accurate data. The principle to calculate hydrocarbon saturation by the reconstructed pseudo-capillary pressure curves is similar with that by the J function method, but the new method has sufficiently considered the impacts from reservoir heterogeneity and distance of various depth to the oil-water contact, without the influence of formation resistivity, therefore making the calculations more accurate.