The pore throat structure characteristics of Paleogene tight sandstone and sandy conglomerate in the Jiyang depression are studied using cast thin section, conventional mercury injection, constant rate mercury injection and micro CT scanning data, and a reservoir classification scheme based on pore throat structure parameters is established. The material composition and structural characteristics of tight reservoirs are analyzed by casting thin section data. The pore throat structure characteristics of tight reservoirs are studied by conventional mercury injection, constant rate mercury injection and micro CT scanning. Ten pore throat structure parameters are analyzed by cluster analysis. Based on the classification results and oil test results, the classification scheme of Paleogene tight reservoirs is established. The Paleogene tight reservoirs in the Jiyang depression have the characteristics of macropores and microthroats, with pores in micron scale, throats in nano-submicron scale, and wide variation of ratio of pore radius to throat radius. The permeability of the tight reservoir is controlled by throat radius, the smaller the difference between pore radius and throat radius, and the more uniform the pore throat size, the higher the permeability will be. The lower limits of average pore throat radius for the tight sandstone and tight sandy conglomerate to produce industrial oil flow without fracturing are 0.6 μm and 0.8 μm, respectively. Reservoirs that can produce industrial oil flow only after fracturing have an average pore-throat radius between 0.2–0.6 μm, and reservoirs with average pore throat radius less than 0.2 μm are ineffective reservoirs under the current fracturing techniques. Different types of tight sandstone and sandy conglomerate reservoirs are classified and evaluated, which are well applied in exploratory evaluation.

利用铸件薄片，常规注汞，等速注汞和显微CT扫描数据研究了济阳depression陷古近系致密砂岩和砂砾岩的孔喉结构特征，建立了基于孔喉结构参数的储层分类方案。 。通过浇铸薄断面数据分析致密储层的物质组成和结构特征。通过常规注汞，恒速注汞和显微CT扫描研究了致密储层的孔喉结构特征。通过聚类分析来分析十个孔喉结构参数。根据分类结果和试油结果，建立了古近系致密油藏分类方案。济阳depression陷古近系致密储层具有大孔微喉特征，孔隙大小为微米级，喉孔为亚亚微米级，孔半径与喉半径之比变化较大。致密储层的渗透率受喉道半径控制，孔半径与喉道半径之差越小，孔喉尺寸越均匀，渗透率越高。致密砂岩和致密砂质砾岩在不破裂的情况下产生工业油流的平均孔喉半径的下限分别为0.6μm和0.8μm。仅在压裂后才能产生工业油流的油藏的平均孔喉半径在0.2-0.6μm之间，而平均孔喉半径小于0的油藏。在目前的压裂技术下，2μm是无效的储层。对不同类型的致密砂岩和砂砾岩储集层进行分类和评估，可以很好地用于勘探评估。