分频分时振幅阈值去噪方法在渤海湾盆地的应用研究  

Research and application of time and frequency dependent amplitude threshold denoising method in Bohai oilfield

作　　者：董水利[1,2] 王征 张明强[1] 屈超银[1] 范宝仓 DONG Shuili;WANG Zheng;ZHANG Mingqiang;QU Chaoyin;FAN Baocang(China Oilfield Services Limited,Tianjin 300451,China;China University of Petroleum(East China),Qingdao 266580,China)

机构地区：[1]中海油田服务股份有限公司,天津300451 [2]中国石油大学(华东),青岛266580

出　　处：《物探化探计算技术》2018年第1期44-48,共5页Computing Techniques For Geophysical and Geochemical Exploration

摘　　要：具有双曲线特征的非线性外源噪声,会严重影响地震数据的最终成像质量,通常这种外源噪声与有效反射的物理特征差异不大且两者频带近乎重叠,因此常规去噪技术很难取得理想的压制效果。若直接剔除被外源噪声干扰的炮记录将会增加采集成本;反之会在一定程度上降低资料的信噪比,影响资料的后续处理。将分频分时振幅阈值去噪方法应用于渤海地震资料的外源噪声压制,在有效压制外源噪声的同时,能够很好地保护有效信号。同时,测试还表明该方法还可以较好地压制近偏移距多次波。With the rapid development of exploration of marine resources,there will be more and more external noise in the seismic record.The nonlinear external noise with the characteristic of hyperbola will decrease the quality of the final image.Since there are almost no differences of the physical characteristics between this kind of noise and primaries and their frequency bands are almost overlap,the commonly-used noise suppression techniques can't obtain ideal results.If we directly get rid of the shot records contaminated by this kind of noise,the cost of acquisition will increase.Otherwise,it will degrade the signal to noise ratio and influence the following processing.So a reasonable external noise suppression method is of vital importance.In this paper,we apply the time and frequency dependent amplitude threshold denoising method to suppress the external noise of Bohai seismic data.Field date tests show that it can not only suppress the external noise effectively but also preserve the primaries well.Meanwhile,this method can also be used to suppress the multiples in the near offsets.

关 键 词：外源噪声 分频分时 振幅阈值 去噪 近偏移距多次波 

分 类 号：P631.4[天文地球—地质矿产勘探]