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特低渗储层油水分布关系复杂、微观孔喉网络分布模式及油水微观渗流机理复杂多变、水驱效率低、开发矛盾突出.可动流体饱和度是精细评价特低渗储层的关键因素,因此,利用铸体薄片、扫描电镜、X衍射、常规压汞、恒速压汞、核磁共振等实验手段,研究分析甘谷驿油田长6储层可动流体饱和度的分布特征及主控因素.结果表明:研究区长6储层的可动流体饱和度偏小,平均值为37.42%.微观孔隙结构是控制可动流体饱和度大小的主要因素,粘土矿物次之,储层物性的影响最弱.渗透率对可动流体饱和度的敏感性显著强于孔隙度.孔隙连通性好,孔喉比小,喉道半径粗、残余粒间孔保存较好、次生孔隙发育,粘土矿物含量小,可动流体饱和度相对较高.粒间孔的剩余程度、溶孔及喉道的发育程度等对储层的好坏及可动流体饱和度的大小具有至关重要的作用.孔隙特征参数中,喉道半径,孔隙半径,孔喉比、单位体积总有效孔喉体积与可动流体饱和度的关系更为密切.
The distribution of oil and water in the ultra-low permeability reservoir is complex, the distribution pattern of micro-pore-throat network and the micro-seepage mechanism of oil and water are complicated and changeable, the waterflooding efficiency is low, and the contradiction between development is prominent.Movable fluid saturation is the key factor to finely evaluate the ultra-low permeability reservoir Therefore, the distribution characteristics and main controlling factors of the movable fluid saturation in Chang 6 reservoir in the Ganguyi Oilfield are studied by the means of casting thin films, scanning electron microscopy, X-ray diffraction, conventional mercury intrusion, constant pressure mercury intrusion and nuclear magnetic resonance The results show that the movable fluid saturation of reservoir No.6 in the study area is small, with an average value of 37.42% .Micro pore structure is the main factor controlling the saturation of mobile fluid, followed by clay mineral and physical property of reservoir The weakest permeability is more sensitive to the saturation of mobile fluid than that of porosity.The porosity connectivity is good, pore-throat ratio is small, throat radius is coarse, residual intergranular pores are well preserved, secondary pores are developed, clay minerals The content is small and the fluid saturation is relatively high.The residual degree of intergranular pores, the growth of dissolved pores and throats are crucial to the quality of reservoirs and the size of the movable fluid. Among the characteristic parameters, The throat radius, pore radius, pore throat ratio, total effective pore throat volume per unit volume are more closely related to the mobile fluid saturation.