折射静校应用研究

An application study of refraction statics,

成都物探研究中心,成都610200

Chengdu Geophysical Prospecting Research Center, Chengdu 610200

在地表地质条件复杂、低降速带速度横向变化大、厚度分布不均匀的地区,仅作一般的高程静校和剩余静校无法得到满意的结果。本文介绍了折射静校,它利用折射波初至时间求得折射速度、延迟时间,从而恢复近地表深度模型,消除低降速带对反射时距曲线的影响。

On setting of complex surface geologic condition and laterally sharp variation in velocity in low velocity layers of varying height, conventional height and residual statics cannot reach satisfactory results. Refraction statics is introduced in this paper which makes use of the first arrivals of refractions to obtain refraction velocity and delay time. Thus, near surface depth model can be restored and the influence of low velocity zones on reflection time distance curve can be eliminated. The Comparison between height statics, ‘Green Mountain’ refraction statics and ProMax refraction statics to field data shows that the effect of ‘Green Mountain’ refraction statics is most obvious in the western areas of Sichun province.