分段扫描压制谐波干扰的效果分析
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摘要
在可控震源激发的地震采集资料中,由于震源机械驱动装置的非线性及震动装置与大地的耦合状况等因素,扫描信号会产生不同类型的谐波畸变,在相关地震记录上形成谐波干扰带。准噶尔盆地不同工区在升频线性扫描记录上常见到与初至折射波的1/2次谐波和强面波的2次、1/2次谐波。这些干扰在一定程度上影响了地震资料质量。针对上述问题,采用分段扫描的方法对谐波进行了压制,对分段扫描压制谐波干扰的软件模拟及野外单炮对比的应用效果做出分析,说明分段扫描压制谐波的效果较好。
In seismic data acquisition with vibrator,the scanning signals would produce various harmonic distortions and form harmonic interference zone in the correlated records because of nonlinear of source of the mechanical driving of vibrator and the its coupling with earth and other factors.The 1 / 2harmonic of the first / second break refraction and the second or 1 / 2harmonic of strong surface wave were always recorded in the upper scanning recorder in the working area of Junggar Basin.The interferences would influence the quality of seismic data at same extents.To solve the problems above,a method for the suppression of harmonic interference is introduced,the application results of numerical simulation of segment scanning and field single shot correlation analyzed.It indicates that the effect of suppression of harmonic scanning is better.
In seismic data acquisition with vibrator,the scanning signals would produce various harmonic distortions and form harmonic interference zone in the correlated records because of nonlinear of source of the mechanical driving of vibrator and the its coupling with earth and other factors.The 1 / 2harmonic of the first / second break refraction and the second or 1 / 2harmonic of strong surface wave were always recorded in the upper scanning recorder in the working area of Junggar Basin.The interferences would influence the quality of seismic data at same extents.To solve the problems above,a method for the suppression of harmonic interference is introduced,the application results of numerical simulation of segment scanning and field single shot correlation analyzed.It indicates that the effect of suppression of harmonic scanning is better.
引文
[1]俞寿朋.高分辨率地震勘探[M].北京:石油工业出版社,1993.
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