压制黄土塬区复杂地表条件下折射多次波的组合激发技术

Combined Excitation Technology of Multiple Refraction Wave under Complex Surface Condition in Loess Area

煤田浅层地震勘探中,下伏地层与上覆地层的速度差异大,野外数据采集中容易形成多次折射波。多次折射波是单炮记录中的主要干扰波之一,严重干扰目的层有效反射波,且远偏道集速度相近难以通过后期处理去除,影响了地震资料的品质。为了较好地压制多次折射波,采用一种新的组合激发方式——立体组合激发方式,用于提高单炮记录的品质。通过试验,效果较好。

In shallow layer coalfield exploration , multiple refraction wave easily form in field data collection because large velocity difference between lower layer and upper layer .Multiple refraction wave is one of main disturbance waves in single shot record and seri -ously disturbs effective refraction wave of goal layer , and velocities of far partial gathers were similar and difficulty be excluded by af-ter-treatment, which influenced quality of seismic information .In order to better suppress multiple refraction wave , applying a new combined excitation manner-stereoscopic excitation to improving single shot record quality .Field test showed the effect was good .