砂岩在三轴压缩下的气体渗透率随变形和破裂的变化

IF 1.9 4区 地球科学 Q3 GEOSCIENCES, MULTIDISCIPLINARY
Yuan-Jian Lin, Jiang-feng Liu, Tao Chen, Shimin Ma, Pei-Lin Wang, H. Bai
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引用次数: 0

摘要

本文利用THMC多场耦合三轴单元系统地研究了砂岩的透气性演化和变形特征。试验充分考虑了围压、轴压和气压对气体渗透特性的影响。砂岩的透气性随围压的增加而降低。围压较低时,气体渗透率的变化大于围压较高时的气体渗透率变化。注气压力对砂岩的渗透率演化有显著影响。随着注气压力的增加,砂岩的透气性有降低的趋势。在相同围压下,样品在卸载路径期间的气体渗透率小于样品在加载路径中的气体渗透率。当施加轴向压力时,轴向应力对砂岩的渗透率演化有显著影响。当轴向压力小于30MPa时,砂岩的气体渗透率随着轴向压力的增加而增加。在大于30MPa的轴向压力下,渗透率随着轴向压力的增加而降低。最后,使用3D X射线CT成像观察了透气性测试后样品的微孔/裂缝结构。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Gas Permeability Change with Deformation and Cracking of a Sandstone under Triaxial Compression
In this paper, a THMC multi-field coupling triaxial cell was used to systematically study the evolution of gas permeability and the deformation characteristics of sandstone. The effects of confining pressure, axial pressure and air pressure on gas permeability characteristics were fully considered in the test. The gas permeability of sandstone decreases with increasing confining pressure. When the confining pressure is low, the variation of gas permeability is greater than the variation of gas permeability at high confining pressure. The gas injection pressure has a significant effect on the gas permeability evolution of sandstone. As the gas injection pressure increases, the gas permeability of sandstone tends to decrease. At the same confining pressure, the gas permeability of the sample during the unloading path is less than the gas permeability of the sample in the loading path. When axial pressure is applied, the axial stress has a significant influence on the permeability evolution of sandstone. When the axial pressure is less than 30 MPa, the gas permeability of the sandstone increases as the axial pressure increases. At axial pressures greater than 30 MPa, the permeability decreases as the axial pressure increases. Finally, the micro-pore/fracture structure of the sample after the gas permeability test was observed using 3D X-ray CT imaging.
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来源期刊
Petroleum Geoscience
Petroleum Geoscience 地学-地球科学综合
CiteScore
4.80
自引率
11.80%
发文量
28
审稿时长
>12 weeks
期刊介绍: Petroleum Geoscience is the international journal of geoenergy and applied earth science, and is co-owned by the Geological Society of London and the European Association of Geoscientists and Engineers (EAGE). Petroleum Geoscience transcends disciplinary boundaries and publishes a balanced mix of articles covering exploration, exploitation, appraisal, development and enhancement of sub-surface hydrocarbon resources and carbon repositories. The integration of disciplines in an applied context, whether for fluid production, carbon storage or related geoenergy applications, is a particular strength of the journal. Articles on enhancing exploration efficiency, lowering technological and environmental risk, and improving hydrocarbon recovery communicate the latest developments in sub-surface geoscience to a wide readership. Petroleum Geoscience provides a multidisciplinary forum for those engaged in the science and technology of the rock-related sub-surface disciplines. The journal reaches some 8000 individual subscribers, and a further 1100 institutional subscriptions provide global access to readers including geologists, geophysicists, petroleum and reservoir engineers, petrophysicists and geochemists in both academia and industry. The journal aims to share knowledge of reservoir geoscience and to reflect the international nature of its development.
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