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塔里木盆地库车坳陷白垩系巴什基奇克组致密砂岩力学性质影响因素及其变化规律

徐珂 鞠玮 张辉 梁艳 尹国庆 王志民 徐浩然 张玮 梁景瑞

徐珂, 鞠玮, 张辉, 梁艳, 尹国庆, 王志民, 徐浩然, 张玮, 梁景瑞. 塔里木盆地库车坳陷白垩系巴什基奇克组致密砂岩力学性质影响因素及其变化规律[J]. 石油实验地质.
引用本文: 徐珂, 鞠玮, 张辉, 梁艳, 尹国庆, 王志民, 徐浩然, 张玮, 梁景瑞. 塔里木盆地库车坳陷白垩系巴什基奇克组致密砂岩力学性质影响因素及其变化规律[J]. 石油实验地质.
XU Ke, JU Wei, ZHANG Hui, LIANG Yan, YIN Guoqing, WANG Zhimin, XU Haoran, ZHANG Wei, LIANG Jingrui. Factors and variations of mechanical properties of tight sandstones in Cretaceous Bashijiqike Formation of Kuqa Depression of Tarim Basin[J]. PETROLEUM GEOLOGY & EXPERIMENT.
Citation: XU Ke, JU Wei, ZHANG Hui, LIANG Yan, YIN Guoqing, WANG Zhimin, XU Haoran, ZHANG Wei, LIANG Jingrui. Factors and variations of mechanical properties of tight sandstones in Cretaceous Bashijiqike Formation of Kuqa Depression of Tarim Basin[J]. PETROLEUM GEOLOGY & EXPERIMENT.

塔里木盆地库车坳陷白垩系巴什基奇克组致密砂岩力学性质影响因素及其变化规律

基金项目: 

中国石油天然气股份有限公司重大科技专项"库车坳陷深层-超深层天然气田开发关键技术研究与应用"(2018E-1803)和江苏省基础研究计划(自然科学基金)面上项目"超深层致密砂岩孔裂隙结构温敏性及力学特性响应机理"(BK20201349)联合资助。

详细信息
    作者简介:

    徐珂(1991-),男,博士,高级工程师,主要从事油气田地质力学科研和生产工作。E-mail:xukee0505@163.com。

    通讯作者:

    鞠玮(1988-),男,博士,副教授,主要从事非常规油气储层地质力学教学与研究工作。E-mail:wju@cumt.edu.cn。

  • 中图分类号: TU45

Factors and variations of mechanical properties of tight sandstones in Cretaceous Bashijiqike Formation of Kuqa Depression of Tarim Basin

  • 摘要:

    为查明塔里木盆地库车坳陷白垩系巴什基奇克组致密砂岩力学特性,结合深层-超深层油气勘探开发的现场问题,采用三轴压缩实验定量研究了围压、流体和加载速率影响岩石力学性质变化的规律,并初步分析其原因。研究结果表明,砂岩试样最大主应力差、弹性模量均随着围压的增大而显著增大,其微观原因在于围压增大使岩石内部质点彼此之间距离缩短,增强了岩石的内聚力,颗粒之间不易离散;砂岩试样经历低围压脆性→脆-韧性转换→高围压韧性变形破裂演化的过程。与干燥砂岩试样相比,纯净水浸泡样、150 g/L溶液浸泡样、250 g/L溶液浸泡样和350 g/L溶液浸泡样弹性模量降低幅度分别为67.71%、61.45%、64.69%和57.32%,纯净水浸泡造成的降低幅度最大,流体矿化度的升高能够减弱岩石力学参数弱化的趋势;晶体表面结晶和双电层厚度变化是上述变化规律的重要控制因素。在较低的加载速率条件时,砂岩试样的最大主应力差、弹性模量和泊松比的值都较小,但随着加载速率的增大增速较快;当加载速率达到一定关键数值之后(本次实验为0.05 mm/min左右),岩石力学参数值增速变缓。

     

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  • 收稿日期:  2023-08-26
  • 修回日期:  2023-10-18
  • 网络出版日期:  2023-12-04

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