压裂/微地震事件地面响应信号模拟
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摘要
微地震监测作为一种监测地下活动情况的手段,在油田开采中的应用开始受到重视。其监测方式可以在井下和地面,井下观测一直被认为是一种较可靠的监测方式,但由于它占用井资源、生产成本高及施工复杂等因素,其发展在一定程度上受到了限制。随着地面检波器性能的提高和信号处理技术的发展,在地面监测压裂微地震将是一种发展趋势。为了揭示微地震事件的波场传播特征,该研究把一个微地震事件震源看作是一个时延爆炸反射点,采用相移加插值的波场延拓方法对设计的地质模型进行数值模拟,并分析了其波场传播特征。模拟的结果揭示了时延爆炸反射的波场传播特征,可以起到很好的示意效果。
Microseismic monitoring,as a means to monitor subsurface activity,it attracted more attention in oilfield exploitation. The microseismic events could be monitored in downhole or on surface. Downhole observation was considered to be a reliable way for microseismic events,because it took well resources with high cost and complex operations,it was limited to a certain extent,with the improvement of performance of surface geophones and technologic development of signal processing,surface fracture monitoring was a trend in the future. To reveal the wave-field propagating characteristics of microseismic events,one microseismic event source was taken as a time-lapse reflection point of explosion,adopt the method of phase-shift plus interpolation wave-field extrapolation was used to simulate and analyze the characteristics of microseismic wave-field propagation. The result of numerical simulation shows that wave-field characteristics of time-lapse explosive reflection and good effect is obtained for display.
引文
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