用核磁T2谱法评价原始气藏流体饱和度——以大庆深层火山岩复杂气藏为例

从油气藏形成机理与油气藏饱和度主控制因素入手，研究了饱和度与毛管压力关系，利用毛管压力饱和度理论构建核磁共振T2分布谱的毛管压力，建立了核磁T2分布谱法评价原始油气藏流体饱和度的新模型。在大庆深层天然气藏饱和度评价中运用该模型进行了含水（气）饱和度处理，结果表明核磁T2谱饱和度处理结果与取心分析饱和度和生产测试饱和度一致性好，认为用核磁T2谱法原始油气藏流体饱和度评价，对复杂、疑难储集层的测井饱和度解释具有实际应用意义。

NMR T2 DISTRIBUTION METHOD FOR EVALUATING FLUID SATURATION OF ORIGINAL HYDROCARBON RESERVOIRS: A CASE FROM COMPLEX GAS RESERVOIRS IN DEEP ZONE VOLCANICS, DAQING

Physical properties and fluid potential are two important factors in the formation of sand lens reservoirs. Based on the two-dimention physical experiment, the paper studies the fluid potential and the interrelations between physical property, fluid potential and accumulation of sand lens. The results of the experiments show that oil always moves from high potential to lower one, and fluid potential determines whether sand lens can be input by oil or not. The oil saturation of sand lens reservoir varies consistently with the change of the porosity and permeability. The sand lens in the lower potential district is more prone to form oil reservoirs than that in high potential district. Moreover, the bigger the fluid potential difference between the sand lens and that of surroundings, the higher the oil saturation of sand lens.