油层的非均质性主要体现为渗透率分布的不均匀。

The heterogeneity of an oil reservoir is mainly characterized by the non-uniformity of permeability distribution.

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因此，应变梯度，因此有关梯度的力学性能有着密切的联系氢气所产生的非均质性非均匀干燥在一层的材料。

So, the strain gradients and consequently the related gradients of mechanical properties are closely linked to hydric heterogeneities generated by non-uniform drying in the layer of material.

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低围压时，岩石试件内材料并未趋于均匀化，非均质性显著，强度尺寸效应明显；

At low confining pressures, the inhomogeneity of rock materials results in obvious strength-size effect.

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