西安地裂缝人工地震反射波勘探覆盖次数

摘要

In the investigation of Xi'an ground fissures,the higher the fold of seismic reflection exploration,the higher the signal⁃to⁃noise ratio profile is obtained.Nevertheless,it also increases the difficulty of field work and raises the exploration cost.In order to study the effect of different folds in Xi'an ground fissure seismic exploration,the authors chose seismic reflection data in three different sites as examples for analysis.These seismic data were processed in different stacking folds via the method for reducing shot points.The stacking profiles with different folds were compared with each other to extract exploration effect in combination with validated borehole informa⁃tion.It is believed that,if original field records have high signal⁃to⁃noise ratios,12 reflection folds can significantly determine the ground fissure anomalies,with 6 reflection folds being the minimum.%在西安地裂缝勘察中，人工地震反射波勘探的覆盖次数越高，叠加剖面信噪比越高，但同时也增加了施工难度，提高了勘探成本。为了研究不同覆盖次数在西安地裂缝地震勘探中勘探效果，笔者通过三个场地地裂缝地震勘探资料的处理分析，采用抽稀炮点方法得出不同覆盖次数的叠加剖面，对比分析了不同剖面的勘探效果，结合验证的钻孔资料，总结了不同覆盖次数的勘探效果，认为在原始记录信噪比较高的情况下，12次反射波覆盖能明显确定地裂缝异常，最低覆盖次数不要低于6次。