地面微地震监测技术在川南页岩气井压裂中的应用

Application of surface microseismic monitoring technology in shale gas well fracturing of South Sichuan

水力压裂是页岩气储层改造的重要手段,压裂时岩石破裂过程会伴随产生强度较弱的"微地震"波。地面微地震监测技术即在地面布设检波器排列对压裂作业进行实时监测,具有施工方便、监测方位角度大的优点。在威远构造H井进行水力压裂时,应用基于偏移叠加的四维能量聚焦地面微地震成像技术,提高了弱信号识别能力和定位精度,准确描述了压裂诱导裂缝的位置、方位和大小及复杂程度,指导了实时压裂和压裂效果评价。

Hydraulic fracturing is an important means of shale gas reservoir reconstruction. When fracturing, rock failure process generates microseismic wave. With the advantages of convenient construction and wide azimuth acquisition, surface microseismic monitoring technology monitors fracturing operation in real time by layout of surface geophones. During hydraulic fracturing of well-H in Weiyuan structure, the application of microseismic image technology, which based on stacking migration four dimensional energy focused principle improved weak signal recognition ability and location accuracy, accurately described induced fracture features, such as location, azimuth, size and complexity, thereby having a guiding significance for real time fracturing and fracturing effects evaluation.