储层原始含油饱和度评价新方法研究

毛管压力曲线是用来评价储层孔隙结构和储层原始含油饱和度的最有效的方法。通过对毛管压力曲线形态特征的深入分析,提出了一种利用砂岩渗透率逐点构造毛管压力曲线的新方法,该方法适合于各种不同类型岩石的毛管压力曲线的构造。利用构造的毛管压力曲线实现对油藏原始含油饱和度的连续评价,与测井解释的含油饱和度相比,计算结果的绝对误差为1.46%,相对误差2.5%。

Study on a new method for evaluating initial oil saturation of reservoir

Capillary pressure curve is considered to be the most effective way to evaluate reservoir pore structure and initial oil saturation of reservoir. Based on the analysis of the morphologic characteristics of capillary pressure curves thoroughly, a new method to obtain capillary pressure curve at point - to - point was presented using the permeability of sandstone. This method was available in various types of reservoirs. Using this constructive capillary pressure curves, the initial oil saturation of reservoir can be e-valuated consecutively. Compared with the oil saturation which was gained by well logging interpretation, the absolute error was 1. 46% and the fractional error was 2. 5%.