微地震技术在地面井压裂监测中的应用

Application of micro-earthquake technology in fracture monitoring of on-ground well

利用微地震裂缝监测技术,测量压裂时注入到煤层中的压裂液所引起的地面微地震信号的变化来解释压裂裂缝参数。通过对成庄煤矿CZYC-10井和CZYC-11井压裂裂缝进行了监测得出,成庄矿该区域内压裂裂缝为近似水平裂缝,裂缝形状为不规则的椭圆形;压裂井的裂缝的长轴方位为北东70°-81°,压裂裂缝东西长轴全长216-221 m,南北轴裂缝全长157-177 m;现场实测到的裂隙形态、缝长和方位可为下一步布井、压裂方法设计等提供参考,为沁水煤田的煤层气开发管理提供参考。

By using micro-seismic fracture monitoring technology, the authors measured the change of ground micro seismic signal which is caused by the fracturing fluid injected into coal seam when fracturing was used to explain the fracturing fracture parameters. Through monitoring the fracturing cracks of Chengzhuang Coal Mine＇s CZYC-IO and CZYC-11 well,we concluded that the fracturing cracks in this area of Chengzhuang Coal Mine is the approximate horizontal crack, and the shape of the fracturing cracks is an irregular oval;The long axis of the fractured well＇s cracks is 70°- 81°north of the East,the east-west major axis of the fracturing cracks is 216 - 221 m in full length,and the north-south major axis is 157 - 177 m in full length. The fracture morphology, crack length and position obtained by the field measurement, can provide reference for the design of well distribution and fracturing method in the next step, and also provide reference for the development and management of coalbed methane in Qiushui Coal Field.