侏罗系陆相储层岩石力学特性研究--以四川盆地东部凉高山组二段下亚段为例  

Study on the rock mechanical properties of Jurassic terrestrial reservoirs:a case study of the lower sub-section of the second section in Lianggaoshan Formation of the eastern Sichuan Basin

作　　者：赵珠宇 闫传梁 程远方[1,2] 韩忠英[1,2] 薛锦春[3] ZHAO ZhuYu;YAN ChuanLiang;CHENG YuanFang;HAN ZhongYing;XUE JinChun(School of Petroleum Engineering,China University of Petroleum(East China),Qingdao 266580,China;Key Laboratory of Unconventional Oil and Gas Development,Ministry of Education,China University of Petroleum(East China),Qingdao 266580,China;School of Energy and Mechanical Engineering,Jiangxi University of Science and Technology,Nanchang 330013,China)

机构地区：[1]中国石油大学(华东)石油工程学院,青岛266580 [2]中国石油大学(华东)非常规油气开发教育部重点实验室,青岛266580 [3]江西理工大学能源与机械工程学院,南昌330013

出　　处：《地球物理学进展》2025年第1期266-275,共10页Progress in Geophysics

基　　金：国家自然科学基金项目(51974353,51704311,51664016);山东省重点研发计划项目(2019GGX103025);江西省重点研发计划项目(20212BBG73013);山东省高等学校“青创团队计划”(2022KJ072)联合资助.

摘　　要：以四川盆地东部凉高山组储层岩石为研究对象,开展陆相储层岩石三轴压缩试验.研究了砂岩和页岩力学特性、破坏模式以及能量演化规律,基于分形理论确定了储层岩石裂缝分布形态特征.结果表明:在研究深度范围内,砂岩和页岩抗压强度平均值分别为293.74 MPa、140.48 MPa,砂岩具有较强的硬脆性特征,表现出交叉剪胀破坏模式;页岩具有较强延性,破坏模式为劈裂破坏.岩石破坏后的裂缝分布形态具备统计自相似性.页岩分形维数大,裂缝网复杂程度高,可压裂性好.此外,能量在极限弹性能前主要以储能和内部裂纹扩展耗能为主,极限弹性能后以应力驱动弹性能的瞬间释放产生宏观破坏.研究结果可为储层的开发提供力学特性和能量演化等方面的认识和理论参考.Triaxial compression tests of terrestrial reservoir rocks were carried out with the reservoir rocks of the Lianggaoshan Formation in the eastern Sichuan Basin as the research object.The mechanical properties,damage modes,and energy evolution laws of sandstone and shale were investigated,while the morphological characteristics of the distribution of cracks in the reservoir rocks were determined based on the fractal theory.The results show that the average values of sandstone and shale compressive strength are 293.74 MPa and 140.48 MPa respectively in the range of the studied depth.Sandstone has strong hard and brittle characteristics,showing cross-shear expansion damage mode;shale damage mode is splitting damage.The fracture distribution pattern after rock damage possesses statistical self-similarity.The shale fractal dimension is large,the complexity of the fracture network is high,and the factorability is good.In addition,the energy is mainly dissipated by energy storage and internal crack extension before the ultimate elastic energy,and the instantaneous release of stress-driven elastic energy produces macroscopic damage after the ultimate elastic energy.The results of the study can provide an understanding and theoretical reference for the development of reservoirs in terms of mechanical properties and energy evolution.

关 键 词：凉高山组 岩石力学 破坏模式 分形理论 能量演化 

分 类 号：P631[天文地球—地质矿产勘探]