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目前塔河地区开发地震采用了30m道距,中-近炮检距面波干扰较严重.本文对实际单炮的波场特征进行分析后,分别建立了该区5m、10m、20m和30m道距的单炮模型,然后对不同道距单炮模型进行了FK谱分析,发现采用30m道距时,由于干扰波的空间假频与反射波混叠在一起,FK滤波去噪效果有限;当采用20m道距时,虽然干扰波仍存在空间假频现象,但已能与反射波信号明显区分开,滤波去噪效果明显改善;当道距小于10m时,干扰波不存在空间假频现象,去噪效果最理想.结合实际单炮资料的FK谱及去噪效果分析,说明塔河地区通过减小检波器道距仍有改善地震资料品质的潜力.
At present, the 30m track distance is used for the development of earthquakes in Tahe area, and the disturbance of the mid-near-far offset surface-wave is more serious.In this paper, the characteristics of the actual single-gun wave field are analyzed, and the 5m, 10m, 20m and 30m FK spectrum analysis of the single-gun model with different track distances shows that the effect of FK filtering is limited when the spatial aliasing of the interference wave and the reflected wave are mixed together at a distance of 30 m. When using 20m track distance, although there is still space aliasing phenomenon in the interference wave, it can be clearly distinguished from the reflected wave signal, and the filtering denoising effect is obviously improved. When the track pitch is less than 10m, there is no spatial aliasing phenomenon in the interference wave The best noise effect.According to the FK spectrum and denoising effect of the actual single shot data, the potential of the seismic data quality in Tahe area can be improved by reducing the detector track distance.