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鄂尔多斯盆地长7致密油资源丰富,储层地面空气渗透率小于0.3×10-3μm2,物性较差,可动流体饱和度是该类储层评价的关键参数之一。采用离心实验和核磁共振T2谱分析技术相结合的方法,开展了鄂尔多斯盆地长7致密储层可动流体分布特征研究,研究结果表明:一是长7致密储层单相可动水饱和度平均为39.40%,其中微米级(大于1μm)、亚微米级(0.1~1.0μm)及纳米级(小于0.1μm)可动水饱和度分别为2.2%、25.67%及11.52%;岩心束缚水下可动油含量平均为26.07%,其中微米级(大于1μm)、亚微米级(0.1~1.0μm)及纳米级(小于0.1μm)可动油含量分别为0.79%、9.48%及15.81%;可动流体主要分布在亚微米和纳米孔喉中。二是随着岩心渗透率的增大,可动水和可动油饱和度都增大;但不同喉道半径控制的可动流体饱和度增加幅度不同,喉道半径为0.10~0.5μm的可动流体饱和度随着岩心渗透率的增大都增大,且增幅最大,其次是喉道半径处于0.5~1.0μm的可动流体,喉道半径大于1.0μm的可动流体饱和度增幅最小,而喉道半径小于0.1μm的可动流体饱和度相对含量降低的趋势比较明显。
Ordos Basin, Chang 7 tight oil is rich in resources, the reservoir permeability of the ground air is less than 0.3 × 10-3μm2, poor physical properties, mobile fluid saturation is one of the key parameters of this type of reservoir evaluation. Centrifugal experiments and T2 magnetic resonance spectroscopy were used to study the distribution characteristics of the movable fluid in the Chang 7 tight reservoir in the Ordos Basin. The results show that: 1) the average single-phase movable water saturation in the Chang 7 tight reservoir Is 39.40%. The movable water saturations of micron (more than 1μm), submicron (0.1 ~ 1.0μm) and nanoscale (less than 0.1μm) are respectively 2.2%, 25.67% and 11.52% The average oil content was 26.07%. The content of movable oil in the order of micron (more than 1μm), submicron (0.1 ~ 1.0μm) and nanoscale (less than 0.1μm) were 0.79%, 9.48% and 15.81% The fluid is mainly distributed in the sub-micron and nano-pore throat. Second, with the increase of core permeability, both movable water and movable oil saturation increase. However, the range of increase of movable fluid saturation controlled by different throat radius is different, and the throat radius is 0.10-0.5 μm The dynamic fluid saturation increases with the increase of core permeability, followed by the moving fluid whose throat radius is 0.5 ~ 1.0μm, and the moving fluid saturation with the throat radius greater than 1.0μm increases least The tendency of the relative content of the movable fluid with the throat radius less than 0.1μm to decrease is obvious.