利用微地震参数评估水力压裂改造效果研究进展

Recent advances in microseismic monitoring and implications for hydraulic fracturing mapping

微地震监测是定量评估水力压裂改造效果的主要方法,对于高效开发非常规油气储层具有重要意义。然而,微地震监测技术在微地震事件产生机理、微地震弱事件检测和定位、综合解释等方面仍然面临诸多挑战。本文以四川盆地某页岩气井综合微地震监测实验为例,从监测台阵、微地震参数获取和资料解释三方面,总结了微地震监测技术的研究现状和发展趋势。结合课题组的研究特色,重点讨论了地面微地震监测台阵、样本事件扫描检测弱地震事件、震源机制反演等技术在水力压裂改造效果中的应用,展望了我国微地震监测技术未来发展方向。

As a valuable technology for evaluating the effectiveness of hydraulic fracturing operation,microseismic monitoring is essential for scientific and efficient development of unconventional reservoirs.However,several key aspects of this technology,including microseismic geomechanics,detection and accurate location of weak microseismic events and comprehensive interpretation,remain elusive or challengeable.Taking an integrated microseismic monitoring project in the Sichuan basin shale play as an example,we summarize recent advances in several aspects of microseismic monitoring,including data acquisition,processing and interpretation.Considering the research features of the Center of Global and Applied Seismology(CGAS) of China University of Petroleum-Beijing,this paper elaborates on surface microseismic monitoring arrays,weak event detection with a template-based method,source mechanism inversions and their implications in hydraulic fracturing imaging.Finally,several key scientific issues to be further studied are outlined.