论文部分内容阅读
含油饱和度是油层的基本参数,可根据测井资料计算砂层的视含油饱和度,进而划分油水层(见图1、图2)。实践证明,这方法对一般纯砂岩层效果显著,而对自然电位岩性减小系数(α)小于0.5,自然伽(亻马)相对值(△GR)大于0.4的差岩性油层,计算的视含油饱和度往往偏低,与水层难以区分。采用综合判断方法,符合率也很低。如港中205井(油基泥浆取心)33号层,岩心分析S_w=67％,岩性、电性也差,考虑取心及录
Oil saturation is the basic parameter of oil reservoir. According to logging data, the oil saturation of sand layer can be calculated, and then the oil-water layer can be divided (see Figure 1 and Figure 2). It has been proved that this method is effective for general pure sandstone formations. However, for poor lithologic reservoirs with a natural reduction coefficient (α) less than 0.5 and a natural gamma (ΔGR) greater than 0.4, Depending on the oil saturation is often low, difficult to distinguish with the water layer. Using a comprehensive method of judgment, the coincidence rate is also very low. Such as Hong Kong 205 wells (oil-based mud coring) 33 layer, core analysis S_w = 67%, lithology, electrical properties are poor, taking into account the heart and recorded