【摘要】 陆相页岩的非均质性与海相页岩不同,其主要表现为孔隙结构的非均质性。以鄂尔多斯盆地瑶科1井采出的上三叠统长7~2黑色页岩为例,利用微米CT在1μm分辨率下对7个不同边长(100～700μm)、纳米CT在65 nm分辨率下对4个不同边长(10～39μm)的孔隙和裂缝进行了观测和分析。建立了3D图像重构基础上的不同边长及分辨率的孔隙指标非均质特性表征:孔隙数量和体积随边长增加而呈指数增大,面密度随边长增大而减小,长宽平均值及其比值基本不变。作为表征连通性指标的配位数与孔隙长度均值关系较为密切。更多还原

【Abstract】 Continental shale is different from marine shale due to its inhomogeneity, which is apparent mainly in the inhomogeneity of pore structure. The Upper Triassic Yanchang black shale(Chang 7~2) samples were collected from the well Yaoke 1 in the Ordos Basin. Micro and nano CT were used to observe and analyze the pores and cracks of 7 different side lengths(100-700 μm) and 4 different side lengths(10-39 μm) at 1 μm and 65 nm resolutions, respectively.The spatial inhomogeneity index of different side lengths and resolutions based on 3 D image reconstruction was established. It was found that the number and volume of pores increased exponentially with the increase of side lengths, while the plane density of the pores decreased with the increase of side lengths. The average length, width and their ratio remained basically unchanged. Coordination number, as an indicator of connectivity, is closely related to the average width of pores.更多还原