Knowledge Management System of Institute of Rock and Soil Mechanics,CAS
| An Analytical Model for Assessing Stability of Pre-Existing Faults in Caprock Caused by Fluid Injection and Extraction in a Reservoir | |
Wang, Lei; Bai, Bing; Li, Xiaochun ; Liu, Mingze; Wu, Haiqing; Hu, Shaobin
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| 2016 | |
| 发表期刊 | ROCK MECHANICS AND ROCK ENGINEERING
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| ISSN | 0723-2632 |
| 卷号 | 49期号:7页码:2845-2863 |
| 摘要 | Induced seismicity and fault reactivation associated with fluid injection and depletion were reported in hydrocarbon, geothermal, and waste fluid injection fields worldwide. Here, we establish an analytical model to assess fault reactivation surrounding a reservoir during fluid injection and extraction that considers the stress concentrations at the fault tips and the effects of fault length. In this model, induced stress analysis in a full-space under the plane strain condition is implemented based on Eshelby's theory of inclusions in terms of a homogeneous, isotropic, and poroelastic medium. The stress intensity factor concept in linear elastic fracture mechanics is adopted as an instability criterion for pre-existing faults in surrounding rocks. To characterize the fault reactivation caused by fluid injection and extraction, we define a new index, the "fault reactivation factor" eta, which can be interpreted as an index of fault stability in response to fluid pressure changes per unit within a reservoir resulting from injection or extraction. The critical fluid pressure change within a reservoir is also determined by the superposition principle using the in situ stress surrounding a fault. Our parameter sensitivity analyses show that the fault reactivation tendency is strongly sensitive to fault location, fault length, fault dip angle, and Poisson's ratio of the surrounding rock. Our case study demonstrates that the proposed model focuses on the mechanical behavior of the whole fault, unlike the conventional methodologies. The proposed method can be applied to engineering cases related to injection and depletion within a reservoir owing to its efficient computational codes implementation. |
| 关键词 | Fault reactivation Injection Depletion Caprock Reservoir SIF |
| DOI | 10.1007/s00603-016-0933-0 |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS研究方向 | Engineering ; Geology |
| WOS类目 | Engineering, Geological ; Geosciences, Multidisciplinary |
| WOS记录号 | WOS:000379015700022 |
| 出版者 | SPRINGER WIEN |
| 引用统计 | |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://119.78.100.198/handle/2S6PX9GI/3891 |
| 专题 | 岩土力学所知识全产出_期刊论文 国家重点实验室知识产出_期刊论文 |
| 作者单位 | Chinese Acad Sci, Inst Rock & Soil Mech, State Key Lab Geomech & Geotech Engn |
| 第一作者单位 | 中科院武汉岩土力学所 |
| 推荐引用方式 GB/T 7714 | Wang, Lei,Bai, Bing,Li, Xiaochun,et al. An Analytical Model for Assessing Stability of Pre-Existing Faults in Caprock Caused by Fluid Injection and Extraction in a Reservoir[J]. ROCK MECHANICS AND ROCK ENGINEERING,2016,49(7):2845-2863. |
| APA | Wang, Lei,Bai, Bing,Li, Xiaochun,Liu, Mingze,Wu, Haiqing,&Hu, Shaobin.(2016).An Analytical Model for Assessing Stability of Pre-Existing Faults in Caprock Caused by Fluid Injection and Extraction in a Reservoir.ROCK MECHANICS AND ROCK ENGINEERING,49(7),2845-2863. |
| MLA | Wang, Lei,et al."An Analytical Model for Assessing Stability of Pre-Existing Faults in Caprock Caused by Fluid Injection and Extraction in a Reservoir".ROCK MECHANICS AND ROCK ENGINEERING 49.7(2016):2845-2863. |
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