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基于声发射试验的大安深层页岩气田地应力分布特征分析
In-situ stress distribution characteristics of the deep shale gas field in Da′an based on acoustic emission tests
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- DOI:
- 10.3969/j.issn.1001-2206.2026.01.005
- 作者:
- 闵泓铫, 刘江, 冯国栋
MIN Hongyao, LIU Jiang, FENG Guodong
- 作者单位:
- 重庆科技大学土木与水利工程学院, 重庆 401331
School of Civil and Hydraulic Engineering, Chongqing University of Science and Technology, Chongqing 401331, China
- 关键词:
- 深层页岩气; 声发射; 地应力特征; 影响因素; 地面试验
deep shale gas;acoustic emission;in-situ stress characteristics;influencing factor;ground test
- 摘要:
- 页岩气已成为我国重要的非常规天然气资源。为探究深层页岩地应力分布特征，以支撑页岩气开采方案的优化与安全生产，对取自大安地区深层页岩试样采用声发射技术开展静态三轴试验，获取页岩静态力学参数，计算地应力值。通过对比声发射试验与测井资料地应力测试结果，验证了基于Kaiser效应的声发射法在测试地应力方面的可行性。研究发现：大安地区页岩地应力大小与埋深呈正相关，应力状态为SH > SV > Sh。侧压力系数K值在1 500~2 200 m埋深段较稳定，平均值为1.0，与我国其他深层页岩区域应力场趋势接近。此外，进一步分析了埋深、泊松比、弹性模量等参数对地应力的影响规律。研究成果可为大安深层页岩气田开采提供理论依据，也可为类似地质条件的页岩气开发提供技术参考。
Shale gas has become an important unconventional natural gas resource in China. This paper aims to explore the in-situ stress distribution characteristics of deep shale and support the optimization of shale gas exploitation scheme and safe production. The static triaxial test was carried out on deep shale from the Da'an area by using acoustic emission technology to obtain the static mechanical parameters of shale, calculate the in-situ stress, compare the in-situ stress results of the acoustic emission test and logging data, and verify the feasibility of the acoustic emission method based on the Kaiser effect in testing in-situ stress. It is found that the insitu stress of shale in the Da'an area is positively correlated with the buried depth, and the stress state is in order of SH> SV>Sh. The lateral pressure coefficient K value is relatively stable at 1 500~2 200 m buried depth, with an average value of 1.0, which is close to the stress field trend of other deep shale regions in China. In addition, the effects of buried depth, Poisson's ratio, and elastic modulus on insitu stress were further analyzed. The research results can provide a theoretical basis for the exploitation of the deep shale gas field in the Da'an area and a technical reference for the development of shale gas under similar geological conditions.