摘要
在复杂地表区地震勘探中,广泛应用炮点组合激发消除干扰,提高单炮记录的品质。二维相控震源的排列长度和三维相控震源的组合面积决定了定向地震波束的宽度,即地震波能量的定向聚焦状态。本文借用军工领域的相控理论,通过组合激发的时间或深度控制实现相位组合控制,设计合理的组合激发模式,将发散传播的地震波集中于某个方向,即激发定向地震波束,使观测系统接收的反射信号增强,所采集资料的信噪比提高,从而有效地改善了地震勘探效果。
For complex surface seismic exploration,source arrays are widely used to eliminate interference and improve shot record quality.The array length of 2D phased source or the array area of 3D phased source determines the beam width of directional seismic waves,namely the energy directional focus state.Using the phased-array theory in military field,this work discusses a method for source array design by controlling the shoting time or the shoting depth to realize phase control.By designing an optimal source array,divergent spread seismic waves focus on a certain direction,namely synthesis directional beam.In this case,reflected energy level received by the acquisition system will be increased,and the signal-to-noise ratios of the data will also be enhanced.
出处
《石油地球物理勘探》
EI
CSCD
北大核心
2011年第2期170-175,155,共6页
Oil Geophysical Prospecting
基金
国家科技重大专项(2008ZX05046)资助
关键词
相控理论
炮点组合激发
定向地震波
信噪比
激发效率
地震数据采集
phased-array theory,source array shooting,directional seismic wave,signal-to-noise ratio(SNR),explosion efficiency,seismic data acquisition
