On equivalence of dual-porosity poroelastic parameters
On equivalence of dual-porosity poroelastic parameters
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DOI：
10.1029/1999jb900072
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发表时间：
1999-05
影响因子：
--
通讯作者：
M. Bai
中科院分区：
文献类型：
--
作者：
M. Bai
本文深入讨论了目前双孔隙度多孔弹性（DPP）模型在参数相容性方面的等效性，当进一步探讨每个模型的物理含义时，这些参数相容性被打破。大多数现有的DPP模型设想的弹性参数，无论是作为那些特征的矩阵块或集总的矩阵块和裂缝划定。前者表征的缺陷是它忽略了断裂变形的重要影响，断裂变形由于其更大的可压缩性而应远大于基质变形;后者描绘的缺点是它忽略了基质和断裂变形之间的显著差异，这不能为相关的实验研究提供清晰的视野。作为对这些方法的补救措施，对现有DPP模型中的参数关系进行了修改，以适应兼容性要求。此外，为了尽量减少相关DPP模型中的概念冲突，提出了双重孔隙介质有效应力定律的合理格式。修正后的有效应力法便于将DPP模型扩展到多孔介质的多孔弹性模型。
This paper elicits an in-depth discussion on equivalence of current dual-porosity poroelastic (DPP) models in terms of their parametric compatibilities, which are shown to break down when physical implications of each model are further probed. The majority of existing DPP models envision the elastic parameters either as those characterizing the matrix blocks only or as the lumped ones delineating for both the matrix blocks and fractures. The flaw of the former characterization is that it neglects the important impact of fracture deformation which should be substantially larger than the matrix deformation because of its greater compressibility; the drawback of the latter delineation is that it omits the significant difference between the matrix and fracture deformations which cannot offer a clear vision for the relevant experimental studies. As a remedy to these approaches, modifications of the parametric relationships in the existing DPP models are provided to accommodate the compatibility requirements. In addition, as an effort to minimize conceptual conflicts in the associated DPP models, sensible formats of the effective stress laws for the dual-porosity media are presented. The revised effective stress law facilitates the extension of the DPP model to multiporosity poroelastic formulations.