中东某油田低阻油层含水饱和度计算方法探讨

中东某地区H油田N-B地层下部砂岩含有一定的泥质,岩石骨架含黄铁矿导电矿物以及高矿化度地层水,是该段地层的低阻形成机理。在地质、试油等资料较少的条件下,建立了综合考虑这3个因素的新的含水饱和度计算模型,将该模型与传统的Archie公式所计算的含油气饱和度结果进行对比,前者的含油气饱和度结果明显高于后者。根据该含水饱和度模型在中东某油田低阻油层的应用效果表明,该模型计算的含油气饱和度结果与地区的试油、岩心资料较为一致。

Method for Calculating Water Saturation in Low-resistivity Reservoirs of An Oilfield in Middle East

The clay content,pyrite in matrix and formation water with high sanity existed in low resistivity sandstone of N-B formation of H Oilfield in the Middle East,it was the formation mechanism of low resistivirty.For the incompletion of geological data and oil test data,a new water saturation model considering the clay content,pyrite in matix and formation water with high sanity was established.Compered with the calculated hydrocarbon saturation of the model with the traditional one calculated by Archie Formula,the hydrocarbon saturation of the former is significantly higher than that of the latter.The application effect of the established water saturation model of the low-resistivity oil reservoir in the Middle East is examined,and the hydrocarbon saturation result calculated by this model is coincidence with the oil test data and core data of the zone.