微地震监测技术在水平井压裂中的应用

THE APPLICATION OF MICRO-SEISMIC MONITORING TECHNOLOGY TO THE STUDY OF HORIZONTAL WELL FRACTURING

用微地震法在油田生产波及区对生产动态进行实时监测,是目前国内外广泛关注的前沿课题。文中论述了产生微地震事件的力学机理、微地震监测原理及方法。利用微地震监测技术对泌阳凹陷BYHF1页岩水平井分段大型压裂过程实时监测,运用偶极子测井和VSP资料建立监测井区的初始速度模型,并通过射孔炮对其校正。在识别出有效微震事件的基础上,利用纵波和横波信息计算得到微地震事件的位置,通过可视化技术对压裂井区裂缝发育的方向、大小、空间分布进行了描述,监测结果与成像测井结果吻合良好。

The utilization of the micro-seismic method to conduct real-time dynamic monitoring of the production in the production sweep area of the oilfield is a frontier research topic which has aroused much attention both in China and abroad. This authors deal with the mechanical mechanism producing the micro-seismic event as well as the principle and method of micro-seismic monitoring. The micro-seismic monitoring technique was used to conduct real-time monitoring of the large-scale fracturing process along BYHF1 shale horizontal well section of Biyang depression,the dipole logging and VSP data were used to establish the initial velocity model for the monitored well area,and correction was made through the perforating gun. Based on recognizing the effective micro-seismic event,the authors utilized the longitudinal and transverse wave information to calculate the position of the micro-seismic event,and described the direction,scale and spatial distribution of the fissures in the fracturing well area by using the visualization technology. The result of the monitoring is well consistent with that of the imaging logging.