哈得逊油田位于满加尔凹陷哈得逊构造带上,主要开发石炭系东河砂岩段油层。储层的岩石类型为岩屑石英砂岩,孔隙度为13.7%,渗透率为172.7×10-3μm2。油层有效厚度和含油饱和度是容积法地质储量计算的主要参数,而划分油层有效厚度大小的基础是油层的下限标准。油层下限标准也是油层识别和容积法储量计算的前提,可以用能够渗流流体的最小孔隙度与渗透率来度量;油水层识别可以用含油饱和度来度量。采用含油产状法、频率分布法、最小流动孔喉半径法、试油法、阿尔奇公式等方法,对哈得逊油田东河砂岩段油层下限标准进行研究。结果表明,哈得逊油田东河砂岩段油层的岩性和含油性下限为油迹细砂岩,孔隙度下限为8.0%,渗透率下限为5×10-3μm2,含油饱和度下限为42%。研究结果为储量计算提供了依据,对油田的开发生产具有指导作用。 The Hudson oilfield is located in the Hudson tectonic belt in the Manjiaer Sag, mainly for the development of the Carboniferous Donghe sandstone reservoir. The rock type of the reservoir is lithic quartz sandstone with a porosity of 13.7% and a permeability of 172.7 × 10-3μm2. The effective thickness and oil saturation of the reservoir are the main parameters of the volumetric method for calculating the geological reserves. The basis of the effective thickness of the divided reservoir is the lower limit of the reservoir. The lower limit of oil formation is also the prerequisite for reservoir identification and volumetric reserves calculation, which can be measured by the minimum porosity and permeability of seepage fluid. Oil-water layer identification can be measured by oil saturation. The methods of oil producing method, frequency distribution method, minimum flow pore throat radius method, test oil method and Archie formula were used to study the lower limit of oil layer of Donghe sandstone in Hudson oilfield. The results show that the lower limit of lithology and oil content of the East River sandstone section of the Hudson oilfield is oil trace fine sandstone with the lower limit of porosity of 8.0%, the lower limit of permeability of 5 × 10-3μm2 and the lower limit of oil saturation of 42%. The results provide the basis for the calculation of reserves, which can guide the development and production of oilfields.