This study quantified the anisotropy of element composition in Upper Triassic “Chang 8” shale in Jiyuan district of Ordos Basin , China and provided the microscopic evidence for the existence of dominant fracture zone . Element quantification was carried out ensuring both observational resolution and sample representativeness. Results show that for shale slices in two directions which are 45° (225°) and 0° (180°/360°), the distribution of elements is significantly different from that in other directions. The minimum of element contents often occurs in 45° (225°) and the maximum of element contents often occurs in 0° (180°/360°). The brittleness parameter value stays at a high level from 0° (180°/360°) to 22.5° (202.5°). The maximum value occurs in 0° (180°/360°), and the minimum value occurs in 45° (225°) which has obvious significance in shale stimulation. The conclusion proved that the existence of predominant fracture zone in shale has the microscopic evidence in micro-scale brittle minerals.
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Du et al. (2019) studied this question.
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