Abstract In order to predict the multi-scale fractures in carbonate, the geo-mechanical model need to be established. The key thresholds (0.82 σ c and σ c ) for the micro-fractures and macro-fractures according to the mass release of the elastic strain energy and bursting was confirmed, through CT scanning and some mechanics experiments. Then two physical models between strain energy density and fracture volume density were built based on the geomechanics theory. Combined with the Mohr-Coulomb and Griffith's criterion, the fracture parameters under the complex stress condition were modified and deduced. All geo-mechanical algorithms were written into the finite element platform, combined with the paleo-structural restoration of the Hetianhe anticline, the three-dimensional distribution of the multi-scale fracture density and aperture were quantitatively simulated. The prediction results are consistent with current in-situ core and FMI observations.

中文翻译：

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碳酸盐岩储层多尺度裂缝分布定量预测地质力学模型

摘要 为了预测碳酸盐岩中的多尺度裂缝，需要建立地质力学模型。通过CT扫描和一些力学实验，确定了根据弹性应变能和爆裂的质量释放的微裂缝和宏观裂缝的关键阈值（0.82 σ c 和σ c ）。然后基于地质力学理论建立了应变能密度和裂缝体积密度之间的两个物理模型。结合Mohr-Coulomb和Griffith准则，修正推导复杂应力条件下的断裂参数。将所有地质力学算法写入有限元平台，结合和田河背斜古构造修复，定量模拟了多尺度裂缝密度和孔径的三维分布。预测结果与当前的原位岩心和 FMI 观测结果一致。