• 中文核心期刊
  • 中国科技核心期刊
  • RCCSE中国核心学术期刊
  • Scopus, DOAJ, CA, AJ, JST收录期刊
高级检索

水力压裂增透效果综合物探检验技术研究

Research on Comprehensive Geophysical Exploration Technique Experimental for Permeability Enhanced Effect of Hydraulic Fracturing

  • 摘要: 为检验煤矿瓦斯治理工程中水力压裂增透影响范围,采用电磁波CT法、矿井瞬变电磁法及矿井高密度电法等3种物探方法,分别在水力压裂前后对工作面穿层钻孔压裂区进行探测试验,研究了各物探方法对水力压裂的地球物理响应特征,并验证其有效性。研究结果表明:压裂钻孔周围煤岩层的电性参数在注水压裂后发生了明显变化,电磁波CT法表现为在压裂钻孔位置5~15 m内的围岩场强衰减增大,瞬变电磁法表现为在压裂钻孔附近约20 m范围的视电阻率降低约1.5~2.0倍,矿井高密度电法表现为相对低阻区由压裂钻孔侧向探测巷道方向延展的特征。瓦斯抽采及回采揭露情况与试验结果基本相符。

     

    Abstract: In order to test the influence range of hydraulic fracturing in gas control, three geophysical methods, namely electromagnetic wave CT method, mine transient electromagnetic method and mine high-density electric method, were used to detect through-hole drilling and fracturing area of the working face before and after hydraulic fracturing, the geophysical response characteristics of each geophysical method to hydraulic fracturing were studied and verified its validity. The results show that the electrical parameters of the coal and rock layers around the fractured borehole have changed significantly after water injection and fracturing. The electromagnetic wave CT method shows that the surrounding rock field intensity attenuation in the range of 5 m to 15 m of the fracturing borehole location increases, transient electromagnetic method shows that the apparent resistivity decreases by about 1.5 times to 2.0 times in the range of about 20 m near the fracturing borehole, and the mine high- density electric method is characterized by the extension of the relatively low-resistance zone from the lateral direction of the fracture hole to the detection of the laneway. The gas extraction and recovery exposure are basically consistent with the test results.

     

/

返回文章
返回