The impact of different clay minerals on the anisotropy of clay matrix in shale
The impact of different clay minerals on the anisotropy of clay matrix in shale
复制标题
不同粘土矿物对页岩粘土基质各向异性的影响
DOI：
10.1111/1365-2478.12829
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发表时间：
2019
影响因子：
2.6
通讯作者：
L. D. den Boer
中科院分区：
文献类型：
--
作者：
C. Sayers;L. D. den Boer
尽管粘土是由不连续的各向异性粘土片晶组成的，但许多岩石物理模型将页岩中的粘土片晶视为相互连接的。然而，页岩中的粘土基质可以被建模为嵌入在软各向同性interplatelet区域内的各向异性粘土片晶，允许分析断开的粘土片晶对粘土基质的弹性性质的影响。在这个模型中，interplatelet区域的属性由其有效的体积模量和剪切模量，而粘土血小板的有效属性由它们的体积分数，纵横比和弹性刚度张量。总之，这些参数隐含地解释了粘土和流体性质以及流体饱和度的变化。粘土片晶的弹性刚度从文献中获得，包括层状硅酸盐的完全各向异性（单斜或三斜）弹性刚度张量的实验测量和第一原理计算。这些公布的弹性刚度张量被用来编译一个数据库的等效横观各向同性弹性刚度张量，和其他物理性质，八个常见的品种的层状硅酸盐。粘土基质的各向异性，然后研究这些不同的弹性刚度的影响，和不同的模型参数，有效的横向各向同性弹性刚度张量的粘土基质。研究了不同粘土矿物与其相关各向异性参数之间的关系，并分析了它们对粘土基质各向异性的影响。
Although clay is composed of disconnected anisotropic clay platelets, many rock physics models treat the clay platelets in shale as interconnected. However, the clay matrix in shales can be modelled as anisotropic clay platelets embedded within a soft isotropic interplatelet region, allowing the influence of disconnected clay platelets on the elastic properties of the clay matrix to be analysed. In this model, properties of the interplatelet region are governed by its effective bulk and shear moduli, whereas the effective properties of the clay platelets are governed by their volume fraction, aspect ratio and elastic stiffness tensor. Together, these parameters implicitly account for variations in clay and fluid properties, as well as fluid saturation. Elastic stiffnesses of clay platelets are obtained from the literature, including both experimental measurements and first‐principles calculations of the full anisotropic (monoclinic or triclinic) elastic stiffness tensors of layered silicates. These published elastic stiffness tensors are used to compile a database of equivalent transverse isotropic elastic stiffness tensors, and other physical properties, for eight common varieties of layered silicates. Clay matrix anisotropy is then investigated by examining the influence of these different elastic stiffnesses, and of varying model parameters, upon the effective transverse isotropic elastic stiffness tensor of the clay matrix. The relationship between the different clay minerals and their associated anisotropy parameters is studied, and their impact on the resulting anisotropy of the clay matrix is analysed.
影响因子：
3.1
作者：
B. Militzer;H. Wenk;Stephen Stackhouse;Lars Stixrude
通讯作者：
B. Militzer;H. Wenk;Stephen Stackhouse;Lars Stixrude