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低阻油层是指在同一油水系统内油层电阻率小于和近似等于围岩电阻率的绝对低阻油层;或油、水层电阻率增大率小于2的相对低阻油层。受内因及外因的共同影响,某些低阻油层测井所得到的视电阻率值往往不能反映油层真实的含油饱和度情况,因此开展非电阻率方法计算低阻油层含油饱和度研究非常重要。本文将实验室压汞曲线换算为储层条件下的毛管压力、烃柱高度与含油饱和度的关系曲线,建立含油孔隙体积与烃柱高度、孔隙度的关系曲线,进而求取含油饱和度,为准确评价储层含油性、精确计算低阻油层储量提供了保障。
Low resistivity reservoir refers to the same oil and water system in the reservoir resistivity less than and equal to the absolute resistivity of the surrounding rock resistivity of the absolute low resistivity oil or water resistivity increase rate of less than 2 relatively low resistivity reservoir. Due to the combined effect of internal and external factors, the apparent resistivity values obtained from some low-resistivity oil well logging often can not reflect the true oil saturation of the oil layer. Therefore, it is very important to carry out non-resistivity method to calculate the oil saturation of low oil resistivity reservoirs. In this paper, the laboratory mercury inoculum curve is converted to capillary pressure under reservoir conditions, hydrocarbon column height and oil saturation curve, the establishment of oil-bearing pore volume and hydrocarbon column height and porosity curve, and then obtain the oil saturation, In order to accurately evaluate the oil content of reservoirs, it provides a guarantee for accurately calculating the reserves of low resistivity reservoirs.