组合爆炸法在高分辨率地震勘探中的应用

Multiple shot array applied in highresolution seismic exploration,

震源激发是高分辨率地震勘探野外数据采集的重要环节之一。必须根据不同情况和勘探目的,采用有效的震源及激发方式,才能产生频带宽、高频能量强,且在传播过程中具有一定抗干扰能力的子波。研究表明,采用炸药震源、小药量、浅井、小井距激发的组合爆炸法,不仅能提高有效波的高频成分,使优势信噪比的频带展宽,而且可兼顾中深层的反射能量。采用这种激发方式在多个地区工作,均取得了良好的效果。

Source condition is one of important factors in data acquisition of high-resolution seismic exploration.Effective seismic source and shot means must be used according to different conditions and exploration target,so that the seismic wavelets can be generated which have wide frequency band,strong high-frequency energy and quite good ability to counter noises in propagation.It has been shown experimentally that the use of multiple shot array in which small charge,shallow hole and short hole spacing are adopted not only improves the high- frequency contents of effective waves and the frequency band of high S/N seismic wave but also gives consideration to both mid reflection energy and deep reflection energy.The use of multiple shot array brought fine results of seismic explorations in many areas.