Modeling effective elastic properties of digital rocks using a new dynamic stress-strain simulation method

Modeling effective elastic properties of digital rocks using a new dynamic stress-strain simulation method
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使用新的动态应力应变模拟方法对数字岩石的有效弹性特性进行建模

DOI:
10.1190/geo2016-0556.1
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发表时间:
2017-08
期刊:
影响因子:
3.3
通讯作者:
Shan Rui
Shan Rui
中科院分区:
地球科学2区
文献类型:
--
作者:
Zhu Wei;Zhao Luanxiao;Shan Rui

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摘要基于旋转交错网格有限差分法,我们发展了一种动态应力应变模拟方法,可以在宽频率范围内计算数字岩石的有效弹性。该模拟器的主要优点在于通过沿着指定方向设置指定的边界条件来表征复杂多孔岩石的各向异性行为:垂直于传播波的边缘施加应变边界条件,平行于传播波的边缘施加周期性边界条件。通过对含有随机分布夹杂和定向排列裂纹的微观非均匀多孔介质的数值模拟结果与各向同性和各向异性有效介质理论的自洽近似计算结果的比较,验证了该模拟器的准确性。该动力学模拟器可以成功地捕捉到不同程度针状包裹体岩石的各向异性大小。
ABSTRACTWe have developed a dynamic stress-strain simulation methodology to compute effective elasticity on digital rocks in a wide range of frequency based on the rotated staggered grid finite-difference method. The primary advantage of this simulator lies in characterizing the anisotropic behavior of complex porous rocks by setting specified boundary conditions along specified directions: The edges perpendicular to the propagating wave are applied with a strain boundary condition, and the edges parallel to the propagating wave are applied with a periodic boundary condition. The accuracy of the simulator is validated by comparing the simulating results in microinhomogeneous porous media containing randomly distributed inclusions and aligned oriented cracks, with that obtained by effective medium theories of self-consistent approximation in isotropic and anisotropic domains. This dynamic simulator can successfully capture anisotropic magnitude of rocks containing needle-like inclusions with different degr...
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