鄢雪梅,王永辉,严星明,张合文,易新斌
YAN Xuemei,WANG Yonghui,YAN Xingming,ZHANG Hewen,YI Xinbin

• 1:中国石油勘探开发研究院廊坊分院

摘要(Abstract)：

页岩压裂中慢滑移产生的剪切变形,能在水力裂缝周围诱发大量具有渗流能力的网络通道,是页岩气单井产量的重要来源。四川两口相邻页岩气水平井,采用相同的体积改造工艺、压裂规模、压裂液及地面微地震监测技术,压裂试气产量却相差很大。在获取井物性参数的基础上,结合微地震监测及解释结果,利用气藏数值模拟方法,进行了压后产量拟合,同时对两口井压裂施工压力进行比较分析,并进行了压裂净压力拟合。结果表明:产量较高的压裂井压裂过程中,存在微地震无法监测到的沿着天然裂缝或断层不产生高频地震波的由慢滑移形成的裂缝网络,其对产量的贡献达到了71.5%。
The shear deformation associated with the slow slip during the shale fracturing can induce a great number of network paths with a certain permeability surrounding the hydraulic fractures,and moreover the ways can be the important source of the individual well production of the shale gas. For two near shale gas wells in Sichuan,although adopting the same volume fracturing technology,fracturing scale,fracturing fluid and surface microseismic monitoring technology,the test productions after the fracturings were rather different. On the basis of the obtained physical property parameters of the wells and combined with the microseismic monitoring and interpreted results,this post-frac production matching was conducted with the help of the gas reservoir numerical simulation; and meanwhile,the operation pressures of the two fracturing wells were compared and analyzed,and furthermore the net pressure matching was engaged. The results indicate that for the high-production fractured well,there exit the fracture networks resulted from the slow slip without high-frequency seismic wave along the natural fractures or faults,which cannot be monitored by the micro-seismic method,but the contribution of the networks can reach 71. 5%.

关键词(KeyWords)： 页岩气;体积改造;慢滑移;微地震;气藏数值模拟;压力分析
shale gas;volume fracturing stimulation;slow slip;microseismic survey;gas reservoir numerical simulation;pressure analysis

Abstract:

Keywords:

基金项目(Foundation): 国家科技重大专项“页岩气勘探开发关键技术”(2012ZX05018004);; 国家重点基础研究发展“973”计划“页岩气储层压裂改造机理研究”(2013CB228004);; 中石油股份公司重大专项“体积压裂设计、实时监测及改造后评估技术研究”(2012FCGYLGZ001)

作者(Author): 鄢雪梅,王永辉,严星明,张合文,易新斌
YAN Xuemei,WANG Yonghui,YAN Xingming,ZHANG Hewen,YI Xinbin

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