Special attention has recently been paid to the high-salt formation in Qianjiang depression as its abundant oil resources with ultra-low permeability and porosity. However, the complex pore structure characteristic of the high-salt formation has not been well understood so far because of its pore size ranging from nanometer to micrometer scale. This paper aims to investigate the complex pore structure characteristic of the target high-salt formation based on an integrated experimental approach involving X-ray diffraction (XRD), scanning electron microscope (SEM), mercury injection capillary pressure (MICP), casting lamella observation and nuclear magnetic resonance (NMR) techniques. XRD analysis results indicate that the target formation mainly includes clastic mineral, carbonate mineral and salt mineral, and the content of them are 32.16%, 36.59%, and 24.65%, respectively. The results of SEM and casting lamella observation indicate that storage space of target formation can be divided into intercrystal pores, solution pores, and fractures. Solution pores have great impact on oil production, which includes dolomite dissolved pore and glauberite dissolved pore. Based on the MICP test results, the samples can be divided into pore type and fracture-pore type. The average pore radius of pore type samples and fracture-pore type samples are 0.0144 μm and 0.40 μm, respectively. Pore size distribution (PSD) results from MICP indicate that single peaks appeared in PSD curves of pore type samples and multi-peaks appeared in PSD curves of fracture-pore type samples. Permeability contribution peaks of pore type samples range from 0.01 to 0.03 μm, and permeability contribution peaks of fracture-pore type samples range from 1 to 10 μm. Comparing the permeability contribution of pore type samples and fracture-pore type samples reveals that mesopores and macropores make the vast majority of permeability contribution of the two kind type samples. A method to get permeability contribution of pore throats from PSD results has been introduced in this paper based on T2 NMR test. Comparing the PSD results from MICP and T2 NMR test results shows that T2 NMR test can identify smaller pore throat.

潜江depression陷的高盐地层，由于其丰富的石油资源，超低的渗透率和孔隙度，最近受到了特别的关注。然而，由于其孔径范围从纳米到微米，到目前为止，还没有很好地理解高盐形成的复杂孔结构特征。本文旨在通过涉及X射线衍射（XRD），扫描电子显微镜（SEM），注汞毛细管压力（MICP），铸片观察的综合实验方法研究目标高盐地层的复杂孔隙结构特征和核磁共振（NMR）技术。XRD分析结果表明，目标地层主要包括碎屑矿，碳酸盐矿和盐矿，含量分别为32.16％，36.59％，和24.65％。扫描电镜和铸片观察结果表明，靶材形成的存储空间可分为晶间孔，固溶孔和裂缝。溶液孔隙对产油有很大的影响，其中包括白云石溶解孔隙和钙闪石溶解孔隙。根据MICP测试结果，样品可分为孔型和断裂孔型。孔型样品和断裂孔型样品的平均孔半径分别为0.0144μm和0.40μm。MICP的孔尺寸分布（PSD）结果表明，孔型样品的PSD曲线中出现了单个峰，裂缝孔型样品的PSD曲线中出现了多峰。孔型样品的渗透率贡献峰范围为0.01至0.03μm，裂孔型样品的渗透率贡献峰在1到10μm之间。比较孔隙型样品和裂缝型样品的渗透率贡献发现，中孔和大孔占了两种类型样品的大多数渗透率贡献。在T2 NMR测试的基础上，本文介绍了一种从PSD结果中获取孔喉渗透性贡献的方法。将MICP的PSD结果与T2 NMR测试结果进行比较表明，T2 NMR测试可以识别出较小的孔喉。在T2 NMR测试的基础上，提出了一种从PSD结果中获取孔喉渗透性贡献的方法。将MICP的PSD结果与T2 NMR测试结果进行比较表明，T2 NMR测试可以识别出较小的孔喉。在T2 NMR测试的基础上，本文介绍了一种从PSD结果中获取孔喉渗透性贡献的方法。将MICP的PSD结果与T2 NMR测试结果进行比较表明，T2 NMR测试可以识别出较小的孔喉。