A Novel Hydro‐Grain‐Texture Model to Unveil the Impact of Mineral Grain Anisotropy on Fluid‐Driven Cracking Processes in Crystalline Rock

IF 3.4 2区 工程技术 Q2 ENGINEERING, GEOLOGICAL
Suifeng Wang, Hideaki Yasuhara, Li Zhuang, Xianyu Zhao, Liping Zhang, Tao Wang
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Abstract

The anisotropy at the grain scale significantly impacts cracking behavior of crystalline rocks. However, the anisotropy of mineral structure, especially the grain shape and orientation has been inadequately addressed in studies on hydraulic fracturing. To bridge this gap, this paper introduces a coupled hydro‐grain‐texture model (HGTM) based on discrete element model (DEM) that investigates the influence of grain shape and orientation on fluid‐driven cracking processes in crystalline rock. The HGTM can consider the different mineral grain shapes and orientations by changing the aspect ratio and rotating coordinate axes. Our studies covered six distinct in‐situ stresses, three grain shapes, and five grain orientations. Initially, we present a comprehensive examination of the microcracking processes of hydraulic fracturing. Then the influences of in‐situ stress, grain shape, and grain orientation on cracking processes were studied. The results underscore that both mineral grain and in‐situ stress interplay to influence the hydraulic fracturing of the crystalline rocks. The proposed HGTM can well mimic the propagation process of hydraulic fracturing by comparing with the experimental results and the results reveal that hydraulic fracturing in crystalline rocks is a highly complex process. This research clarifies the complex interplay between grain texture and hydraulic fracturing, offering invaluable insights for optimizing stimulation practices.
揭示矿物晶粒各向异性对流体驱动的结晶岩裂解过程的影响的新型水力-晶粒-纹理模型
晶粒尺度上的各向异性对结晶岩石的开裂行为有重大影响。然而,在有关水力压裂的研究中,矿物结构的各向异性,尤其是晶粒形状和取向的各向异性,还没有得到充分的研究。为了弥补这一不足,本文介绍了基于离散元素模型(DEM)的水力-晶粒-纹理耦合模型(HGTM),该模型研究了晶粒形状和取向对结晶岩流体驱动开裂过程的影响。HGTM 可以通过改变长宽比和旋转坐标轴来考虑不同的矿物晶粒形状和取向。我们的研究涵盖了六种不同的原位应力、三种晶粒形状和五种晶粒取向。首先,我们对水力压裂的微裂缝过程进行了全面研究。然后研究了原位应力、晶粒形状和晶粒取向对开裂过程的影响。结果表明,矿物晶粒和原位应力相互作用,影响了结晶岩的水力压裂。通过与实验结果比较,所提出的 HGTM 可以很好地模拟水力压裂的传播过程,结果表明结晶岩中的水力压裂是一个非常复杂的过程。这项研究阐明了晶粒质地与水力压裂之间复杂的相互作用,为优化压裂实践提供了宝贵的见解。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
CiteScore
6.40
自引率
12.50%
发文量
160
审稿时长
9 months
期刊介绍: The journal welcomes manuscripts that substantially contribute to the understanding of the complex mechanical behaviour of geomaterials (soils, rocks, concrete, ice, snow, and powders), through innovative experimental techniques, and/or through the development of novel numerical or hybrid experimental/numerical modelling concepts in geomechanics. Topics of interest include instabilities and localization, interface and surface phenomena, fracture and failure, multi-physics and other time-dependent phenomena, micromechanics and multi-scale methods, and inverse analysis and stochastic methods. Papers related to energy and environmental issues are particularly welcome. The illustration of the proposed methods and techniques to engineering problems is encouraged. However, manuscripts dealing with applications of existing methods, or proposing incremental improvements to existing methods – in particular marginal extensions of existing analytical solutions or numerical methods – will not be considered for review.
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