石油与天然气地质 ›› 2024, Vol. 45 ›› Issue (5): 1447-1455.doi: 10.11743/ogg20240517
龚训1,2(), 金之钧1,2(), 马新华1,3,4, 刘钰洋3,4, 李关访5, 缪欢6
收稿日期:
2024-04-08
修回日期:
2024-09-06
出版日期:
2024-10-30
发布日期:
2024-11-06
通讯作者:
金之钧
E-mail:2201110675@stu.pku.edu.cn;jinzj1957@pku.edu.cn
第一作者简介:
龚训(1996—),男,博士研究生,非常规油气储层改造。E-mail: 2201110675@stu.pku.edu.cn。
基金项目:
Xun GONG1,2(), Zhijun JIN1,2(), Xinhua MA1,3,4, Yuyang LIU3,4, Guanfang LI5, Huan MIU6
Received:
2024-04-08
Revised:
2024-09-06
Online:
2024-10-30
Published:
2024-11-06
Contact:
Zhijun JIN
E-mail:2201110675@stu.pku.edu.cn;jinzj1957@pku.edu.cn
摘要:
为揭示页岩力学性质和微观破裂机理,对川南地区志留系龙马溪组页岩开展了X射线衍射、三轴压缩、微米CT扫描和扫描电镜测试。研究发现:页岩矿物成分和围压对其力学性质和储层物性具有显著影响。随着脆性矿物含量的增加,页岩弹性模量和峰值应力增大,指示两者具有正相关关系。随着黏土矿物含量的增加,页岩塑性增强,岩石强度降低。随着围压的增加,页岩中的裂缝逐渐闭合、孔隙变形收缩、孔隙度减小,围压越大,压缩越严重。页岩在破坏过程中主要发育矿物颗粒边界裂缝和矿物颗粒内部裂缝两种裂缝。对于力学性质相近的页岩,随着围压的增大,页岩从矿物颗粒边界裂缝占主导演变为矿物颗粒内部裂缝占主导。围压增大导致矿物颗粒内部和颗粒边界裂缝向破碎带演变,页岩发育更多的裂缝。
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