塔河地区地震道距大小对去噪效果的分析  

Analysis of denoising effect at different seismic trace intervals in Tahe area

作　　者：索重辉[1,2] 杨勤勇[1] 张建宁[1] 周小慧[1] 吴伟[1] 隋俊杰[1] 

机构地区：[1]中国石化石油物探技术研究院,南京211103 [2]中国石油大学(北京)地球物理与信息工程学院,北京102249

出　　处：《地球物理学进展》2015年第6期2766-2771,共6页Progress in Geophysics

摘　　要：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.So far seismic data has been acquired with a 30 m trace interval in development seismic in Tahe area,which results in serious surface wave interference at near-to-middle offset.In this paper after analyzing wave field characteristics of actual shotpoint gather,we established numerical shotpoint models for the research area at 5m,10 m,20m,and 30 mtrace interval,respectively.Then,FK filtering is applied for these different shotpoint models.It reveals that at 30 m trace interval,de-noising effect of FK filtering is limited as spatial aliasing of interference wave overlaps with the effective reflected wave.While trace interval decreases to 20 m,although spatial aliasing of interference wave still exists,it can be distinguished from the reflected wave obviously,which shows that de-noising effect of FK filtering is greatly improved.When the trace interval reduces to less than 10 m,spatial aliasing of interference wave no longer exists,and the de-noising effect is most desirable.Integrating with FK spectral and de-noising effect analysis of actual shotpint gather,it illustrates that potential of improving seismic data quality by reducing the trace interval still exists in Tahe area.

关 键 词：塔河 道距 去噪 FK谱 假频 

分 类 号：P631[天文地球—地质矿产勘探]