摘要
以低渗储层岩石为研究对象,利用三轴岩石力学测试系统对牛庄洼陷牛35块低渗储层岩石进行岩石力学测试,获得了低渗储层岩石在储层条件下的弹性模量、泊松比和抗压强度等岩石力学参数。将岩心观察、统计分析与岩石力学试验相结合,探讨岩石力学性质的影响因素。实验测得牛35块的3口单井岩石力学参数,即抗压强度、弹性模量、内聚力等,牛35井高于河125-1井及牛104井;岩石样品的弹性模量、泊松比和抗压强度随着围压的增加而增大,即岩石强度随着围压的增大而增大;应力应变曲线中,岩石样品轴向应变小于3%,符合脆性岩石特征;与河125-1井、牛104井泥质粉砂岩相比,牛35井粉砂岩中脆性矿物,如长石、石英含量高,粘土矿物少,先存薄弱面更少,均一性更好;岩石强度牛35井强于河125-1井及牛104井。
Taking low-permeability reservoir rocks as the research object, the triaxial rock mechanics testing system was used to conduct rock mechanics tests on the Niuzhuang sag Niu-35 low-permeability reservoir rocks, and the elastic model of low-permeability reservoir rocks under reservoir conditions was obtained. Rock mechanics parameters such as mass, Poisson.s ratio and compressive strength. Combine rock core observation, statistical analysis and rock mechanics test to discuss the influence factors of rock mechanics properties. The experimentally measured rock mechanics parameters, such as the compressive strength, elastic modulus, cohesion of Niu-35 well, etc., Niu-35 well is higher than He-125-1 and Niu-104 wells;Niu-35 block of three single-well rock samples of the elastic modulus, poise The loose ratio and compressive strength increase with the increase of confining pressure, that is, the strength of rock increases with the increase of confining pressure;in the stress-strain curve, the axial strain rate is less than 3%, which conforms to the characteristics of brittle rock;Compared with the argillaceous siltstone in well He-125-1 and well Niu-104, the siltstone in well Niu-35 contains more brittle minerals, such as feldspar and quartz, but less clay minerals;there are fewer pre-existing weak areas and better uniformity;rock strength Niu-35 well is stronger than He-125-1 and Niu-104 wells.
作者
于少群
李理
Yu Shaoqun;Li Li(School of Geoscience,China University of Petroleum(East China),Qingdao,Shandong 266580)
出处
《地质科学》
CAS
CSCD
北大核心
2021年第3期845-853,共9页
Chinese Journal of Geology(Scientia Geologica Sinica)
基金
国家科技重大专项课题(编号:2017ZX05009001)资助。
关键词
低渗储层
岩石力学
力学参数
岩心观察
影响因素
Low-permeability reservoir rocks
Rock mechanics
Mechanical parameters
Core observation
Influencing factors
作者简介
于少群,男,1995年生,硕士研究生,构造地质学专业。E⁃mail:s18010046@s.upc.edu.cn;通讯作者:李理,女,1967年生,教授,博士,构造地质学专业。E⁃mail:lili@upc.edu.cn。
