井中激发地表接收的近地表结构调查方法

Investigation method for near-surface structure with shot in hole and received at surface

（1.西南石油大学资源与环境学院，四川成都610500；2.四川石油地球物理勘探公司，四川成都610213）

chool of Resources and Environment,Southwest Petroleum University,Chengdu 610500,China

横波静校正是影响多波地震勘探效果的重要因素。地震微测井技术是获得近地表结构直接而有效的手段，但由于存在震源和初至识别等问题，在多波勘探中的应用受到一定限制。为此，基于炸药震源产生横波的物理机理，提出了井中串状震源激发、地表三分量检波器多道接收的近地表结构调查方法，提出了基于地面纵向排列多道记录能量和时间信息，通过初至叠加扫描获得纵、横波近地表速度的方法。将该方法应用于四川广安地区的横波资料静校正处理，获得了理想的效果，成像质量得到了提高。

S-wave statics is an important influence factor for the effect of multi-wave seismic exploration.Seismic uphole survey is a direct and effective means for obtaining near-surface structure,but its application in multi-wave exploration is limited since the recognition of source and first break is difficult.Therefore,based on the physical mechanisms for dynamite source generating S-wave,a method was proposed to investigate the near surface structure shot by string source in borehole and received by multi-trace three-component geophone on surface.In addition,based on the energy and time information recorded by multi-trace surface longitudinal array,first break stack scanning was used to obtain near surface velocity of P-wave and S-wave.The method was applied to the statics of S-wave data at Guang’an,Sichuan.Ideal result was achieved,and imaging quality was improved.