煤层气水平井微地震成像裂缝监测应用研究

为有效地指导煤层气水平井压裂工程，评价压裂施工效果，提出将微地震成像裂缝监测技术应用于煤层气水平井压裂施工中。利用微地震成像监测煤层气水平井裂缝延伸的方位、缝长及缝高，分析裂缝双翼不对称发育原因。以沁水盆地寺河区块为例，将水平井和同规模、同层位垂直井的裂缝监测结果进行对比分析，结果显示，因布井方位及施工工艺影响，水平井压裂液滤失量大、易产生多裂缝，且裂缝延伸距离相对较短。指出后续水平井布井应考虑水平段轴线与最小主应力方向平行，增大压裂设计规模和压裂级数，以保证煤层气水平井高效开发。 

Application of microseismic monitoring and imaging of fractures in horizontal CBM well

In order to effectively guide fracturing project and evaluate fracturing results, the application of micro seismic imaging and fracture monitoring technology was proposed for fracturing operation in horizontal coalbed methane(CBM)well. Microseismic imaging technology was used to monitor the azimuth, length and height of fractures in horizontal CBM well, to analyze the reasons of asymmetrical development of two wings of fractures. Then the monitoring results of horizontal well and vertical well in the same scale and layer in Sihe block of Qinshui basin were comparatively analyzed. The results indicated that because of the influence of well location and construction technology, the horizontal well had big loss of fracturing fluid, was easy to produce multiple fractures, and the fracture extension distance was relatively short. It is pointed out that for the layout of subsequent horizontal wells, the axis line of the horizontal interval should be parallel to the direction of minimum principal stress, and the scale of fracturing design and fracturing stages should increase so as to ensure the highly efficient development of horizontal CBM wells.