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Study on anisotropy of Longmaxi shale using hydraulic fracturing experiment

文献类型：期刊论文

作者Zhai, Hongyu1,5,6; Chang, Xu1,6; Zhu, Wei4; Lei, Xinglin3; Xue, Ziqiu2
刊名SCIENCE CHINA-EARTH SCIENCES
出版日期2021-02-01
卷号64期号:2页码:260-277
关键词Longmaxi shale Anisotropic parameters Hydraulic fracturing experiment
ISSN号1674-7313
DOI10.1007/s11430-020-9691-2
英文摘要Hydraulic fracturing reservoir reconstruction technology is crucial in the development of shale gas exploitation techniques. Large quantities of high-pressure fluids injected into shale reservoirs significantly alter compressional (P) and shear (S) wave velocities, rock mechanical parameters, and anisotropic characteristics. In this study, differentiated hydraulic fracturing petrophysical experiments were carried out on Longmaxi Formation shale under pseudo-triaxial stress loading conditions. The effects of stress loading methods, and water-rock physical and chemical reactions on P- and S-wave velocities and rock mechanical parameters were compared. The experimental results showed that isotropic stress loading may increase the P- and S-wave velocities and Young's modulus of dry shale kldnsample. Furthermore, it may lead to a weakening of the corresponding anisotropy. In contrast, differential stress loading was able to improve the anisotropy of Young's modulus and accelerate the decrease in the compressive strength of shale in the vertical bedding direction. The water-rock physical and chemical reactions prompted by hydraulic fracturing was found to "soften" shale samples and reduce Young's modulus. The influence of this "soften" effect on the compressional and shear wave velocities of shale was negligible, whilst there was a significant decrease in the anisotropy characteristics of Thomsen parameters, Young's modulus, and Poisson's ratio. The negative linear relationship between the Poisson's ratios of the shale samples was also observed to lose sensitivity to stress loading, as a result of the "soften" effect of fracturing fluid on shale. The results of this study provide a reliable reference point and data support for future research on the mechanical properties of Longmaxi shale rocks.
WOS关键词ELASTIC-WAVE VELOCITIES ; ATTENUATION ANISOTROPY ; ULTRASONIC VELOCITY ; SICHUAN BASIN ; GAS ; PERMEABILITY ; STRENGTH ; ROCK
WOS研究方向Geology
语种英语
WOS记录号WOS:000608667900002
出版者SCIENCE PRESS
源URL[http://ir.iggcas.ac.cn/handle/132A11/100038]  
专题地质与地球物理研究所_中国科学院油气资源研究重点实验室
通讯作者Chang, Xu
作者单位1.Chinese Acad Sci, Innovat Acad Earth Sci, Beijing 100029, Peoples R China
2.Res Inst Innovat Technol Earth, Kyoto 6190292, Japan
3.Geol Survey Japan, Natl Inst Adv Ind Sci & Technol AIST, Ibaraki 3058567, Japan
4.China Univ Petr, State Key Lab Petr Resources & Prospecting, Beijing 102249, Peoples R China
5.China Earthquake Adm, Inst Geophys, Beijing 100081, Peoples R China
6.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Petr Resources Res, Beijing 100029, Peoples R China
推荐引用方式
GB/T 7714		 Zhai, Hongyu,Chang, Xu,Zhu, Wei,et al. Study on anisotropy of Longmaxi shale using hydraulic fracturing experiment[J]. SCIENCE CHINA-EARTH SCIENCES,2021,64(2):260-277.
APA Zhai, Hongyu,Chang, Xu,Zhu, Wei,Lei, Xinglin,&Xue, Ziqiu.(2021).Study on anisotropy of Longmaxi shale using hydraulic fracturing experiment.SCIENCE CHINA-EARTH SCIENCES,64(2),260-277.
MLA Zhai, Hongyu,et al."Study on anisotropy of Longmaxi shale using hydraulic fracturing experiment".SCIENCE CHINA-EARTH SCIENCES 64.2(2021):260-277.

入库方式： OAI收割

来源：地质与地球物理研究所

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