郑庄煤层气井体积压裂裂缝扩展特征研究

为了有效指导煤层气井体积压裂工程，合理评价体积压裂施工效果，将微地震破裂扫描技术应用于煤层气井体积压裂。通过微地震破裂能量扫描技术监测体积压裂裂缝的分布，结合压裂施工曲线，分析体积压裂裂缝扩展空间和时间特征。以沁水盆地郑庄地区为例，该地区垂直井体积压裂过程显示，破裂不一定严格地随着压裂液推进而在时空上连续发展，可能时间是间歇的，空间上是跳跃的。能量密集区域的集合，连接成线、片、网才是压裂的整体影响面积，即水力压裂扩展的有效区域。与同层位普通压裂的垂直井对比显示，液量大小决定着缝网的有效破裂面积和沟通程度，但压裂液量的大小并没有明显影响裂缝的主长度。

Study on fracture propagation characteristics of volume fracturing in Zhengzhuang CBM Well

In order to effectively guide CBM well volume fracturing engineering and reasonably evaluate the effect of volume fracturing，micro seismic fracture scanning technology was applied to CBM well volume fracturing.The micro seismic fracture energy scanning technology was used to monitor the distribution of volume fracturing fractures.Combined with the fracturing operation curve，the space and time characteristics of volume fracturing fracture propagation were analyzed.Taking Zhengzhuang Area of Qinshui Basin as an example，the vertical well volume fracturing process in this area showed that the fracture does not necessarily develop continuously in time and space strictly with the advance of fracturing fluid，but may be intermittent in time and jump in space.The gathering of energy intensive areas and connecting them into lines，slices and nets were the overall influence area of fracturing，that was，the effective area of hydraulic fracturing expansion.Compared with the vertical wells with normal fracturing in the same layer，the fluid volume determines the effective fracture area and communication degree of fracture network，but the fracturing fluid volume did not significantly affect the main fracture length.