不同边长及分辨率下陆相页岩微孔隙非均质特性分析——以鄂尔多斯盆地瑶科1井长72页岩为例

Shiyou shiyan dizhi(2020)

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Abstract
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72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(10~39 μm)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.
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Key words
micropore,block side length,plane density of pores,ratio of pore length with width,yanchang shale,ordos basin
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