利用毛管压力资料计算储层原始含油饱和度的方法

A Method for Calculating Primary Oil Saturation of Reservoir Using Capillary Pressure Experimental Data

原始含油饱和度是油田开发中后期水淹层评价和油藏开发调整方案编制的重要参数。以油气运移成藏理论为基础,通过分析研究区不同物性储层的毛管压力曲线特征,明确了油层原始含油饱和度的高低主要受孔隙结构和油柱高度两方面的影响;在储层分类前提下采用归一化含水饱和度参数与J函数拟合的方法建立了一套综合考虑储层物性和油柱高度的原始含油饱和度计算方法。利用该方法对实测井的水淹层段进行计算,其结果与岩心分析值吻合良好,绝对误差在±5%之间;并且结合该参数,利用"Soy-So双饱和度法"进行A油田的水淹层解释,解释结论与油井实际初产情况吻合,方法的适用性较好。

The original oil saturation is an important parameter for the evaluation of watered out layer and the compilation of reservoir development adjustment plan in the middle and late stage of oilfield development.Based on the theory of oil-gas migration and reservoir formation,through the analysis of the capillary pressure curve characteristics of different physical reservoirs in the study area,it is clear that the original oil saturation of the reservoir is mainly affected by the pore structure and the height of the oil column.Under the premise of reservoir classification,the calculation method of original oil saturation witch considers physical properties and height of the oil column is established by using the method of the fitting of the normalized water saturation parameter and the J-function.Using this method to calculate the watered out interval of the real logging,the result is in good agreement with the core analysis value,and the absolute error is between±5%.Combining with this parameter,using the"Soy-So double saturation method"to interpret the flood level,the interpretation conclusion is consistent with the actual initial production of the oil well,and the applicability of this method is good.