折射延迟时与时深曲线反演模型法静校正技术

THE STATIC CORRECTION TECHNIQUE OF INVERSE MODEL WITH REFRACTION DELAY TIME AND TIME-DEPTH CURVES

地震波在沙丘中的传播速度与沙丘厚度密切相关.利用延迟时反演高速顶界时,采用常速或插值方法求取表层速度,不能正确反应这种变化关系,使反演模型底界存在误差,影响静校正精度.利用微测井成果数据拟和得到时深曲线,再利用延迟时从时深曲线求取表层速度和厚度可有效解决此问题.方法为:解释和分析地震微测井数据→应用地震微测井或有代表性表层结构线段拟合时深曲线→利用野外单炮初至时间获取表层延迟时→应用延迟时与时深曲线反演近地表结构模型→静校正量计算.应用结果表明,该方法快速有效,在M10JQ3D中获得较好效果.

The velocity of seismic wave in sand dune has close relation with the depth of sand dune.While calculate the top boundary of high velocity,constant velocity or interpolation velocity will cause great error and will give wrong statics.Using seismic micro-log result can get the time-depth curve.With the time-depth curve and delay time we can get right velocity and depth.The main technique flow is：to interpret and analyze seismic micro-log data →to fit the time-depth curve with seismic micro-log result or typical near surface structure →to get near surface delay time making use of the first time of shot records →to get the near surface structure model by using delay time and time-depth curves →to compute the statics.The application result show the method is fast and effective.It has gets a pretty result as putting it into use in M10JQ3D area.