石油实验地质2025，Vol.47Issue(6)：1224-1240,17.DOI:10.11781/sysydz2025061224
深层碳酸盐岩岩相与力学性质相关性特征及成因机制
Correlation characteristics and genetic mechanisms between lithofacies and mechanical properties of deep carbonate rocks
摘要
Abstract
To deeply analyze the intrinsic relationship between lithofacies characteristics and the mechanical properties of deep carbonate rocks,the study focuses on the Ordovician Yingshan Formation in the Tahe area of the Tarim Basin.Drilling cores,rock thin sections,and rock mechanics experimental data were comprehensively analyzed to clarify the lithofacies types of the carbonate rocks.Rock components were quantitatively characterized using ImageJ software,and the correlations between different lithofacies and rock mechanical properties were revealed.Three main carbonate rock lithofacies were identified in the Yingshan Formation of the Tahe area:sparry grained limestone,fine-medium crystalline dolomite,and micritic grained limestone.Experimental results revealed signifi-cant differences in rock mechanical properties among these lithofacies.Specifically,the fine-medium crystalline dolomite exhibited the highest compressive strength,Young's modulus,and compressional and shear wave veloci-ties,while the corresponding parameters of the micritic and sparry grained limestones decreased successively.The micritic grained limestone had the highest Poisson's ratio,while the sparry grained limestone had the lowest.Additionally,multiple regression models with three linear equations were developed to describe the relationships between lithofacies and rock mechanics,among which Model 2 achieved the best correlation(R2=0.777).The study elucidated the genetic mechanisms underlying the variations in rock mechanical properties across different lithofacies.Grain size and cement content were the main controlling factors.The compressional and shear wave velocities of grained limestone decreased with increasing grain size,accompanied by a corresponding decrease in compressive strength.In contrast,as cement content increased,the shear and compressional wave velocities signifi-cantly decreased,and a linear functional relationship was observed between particle size and cement content.The study is expected to predict the mechanical properties of deep carbonate rocks through detailed lithofacies analy-sis,thereby advancing the geological and engineering integration process of oil and gas production.关键词
深层碳酸盐岩/岩相特征/岩石力学性质/成因机制/奥陶系/塔里木盆地Key words
deep carbonate rock/lithofacies characteristics/rock mechanical properties/genetic mechanism/Ordovician/Tarim Basin分类
能源科技引用本文复制引用
伍尚嘉,吴俊,樊太亮,丁梦,吕凯迪,李国萃,李衍鹏..深层碳酸盐岩岩相与力学性质相关性特征及成因机制[J].石油实验地质,2025,47(6):1224-1240,17.基金项目
国家自然科学基金项目(U24B6001,42102151)和中央高校基本科研业务费"新教师基本科研能力提升项目"(2652022034)联合资助. （U24B6001,42102151）
