石朝龙;陈军斌;王晓明;孙晨;

• 1:西安石油大学石油工程学院
• 2:西安石油大学陕西省油气井及储层渗流与岩石力学重点实验室

摘要(Abstract)：

为研究页岩储层天然裂缝剪切滑移特性，基于GCTS TRR-1000三轴力学系统，设计了注入流体和水力裂缝共同作用下的天然裂缝剪切滑移实验。实验结果表明：(1)天然裂缝在与水力裂缝相交前就发生了微小的剪切滑移(<0.02 mm),但此过程的剪切滑移是天然裂缝压实所致；裂缝相交后由于注入流体的作用天然裂缝发生破坏，进而产生剪切滑移，此过程剪切滑移量约为相交前的2～10倍。(2)天然裂缝的最大剪切滑移距离和峰值滑移速率随偏应力的增大而增大，较大的偏应力有利于天然裂缝产生剪切滑移。(3)天然裂缝起裂形式随围压的增大由张性向剪切过渡，张性起裂下裂缝峰值滑移速率高、最大滑移距离较小，剪切起裂方式下裂缝峰值滑移速率低、最大滑移距离较大，高围压下裂缝的剪切起裂更有利于裂缝的剪切滑移。(4)天然裂缝破坏前后裂缝面正应力和剪应力差随偏应力和围压的增大而增大，同时天然裂缝最大滑移距离又与裂缝面正应力和剪应力差正相关。

关键词(KeyWords)： 剪切滑移;天然裂缝;水力裂缝;页岩储层;缝网压裂

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金"陆相页岩井周天然裂隙力学活动性评价方法基础研究"(51874239);; 西安石油大学研究生创新与实践能力培养计划(YCS21113090)

作者(Authors): 石朝龙;陈军斌;王晓明;孙晨;

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