应用OVT域体τ-p变换提高地震资料信噪比  

Seismic signal to noise ratio improvement with volume τ-p transform in OVT domain

作　　者：李飞[1] 段文胜[1] 赵锐锐[1] 罗莉莉[1] 党青宁[1] 

机构地区：[1]中国石油塔里木油田分公司勘探开发研究院,新疆库尔勒841000

出　　处：《石油地球物理勘探》2015年第3期418-423,2,共6页Oil Geophysical Prospecting

基　　金：中国石油股份重大专项"塔里木油田勘探开发关键技术研究"(2010E2108)资助

摘　　要：体τ-p变换技术将常规二维τ-p变换去噪方法应用于三维叠后数据体,可显著提高信噪比。OVT(Offset Vector Tile)域道集可延展至全工区的单次覆盖特性,便于在叠前应用体τ-p变换技术。在OVT域将体τ-p变换技术应用于TG地区实际低信噪比数据,并与常规3D-RNA技术进行对比,结果表明:无论是在去噪未实施偏移前还是在去噪实施偏移后,体τ-p变换技术压制随机噪声、提高信噪比的效果均明显优于3D-RNA技术,因此它是一种提高低信噪比地区地震资料成像品质的有效手段。Volumeτ-ptransform can remove noise on 3D poststack data and improve greatly the signal to noise(S/N)ratio as conventional 2D τ-p transform does on 2D poststack data.Offset vector tile(OVT)gathers are featured with single-fold in the whole survey,so volumeτ-ptransform can be easily applied on the OVT domain.Both volumeτ-p transform and 3D-RNA are applied on low S/N ratio seismic data in TG area.The results show that the volumeτ-p transform achieves much better noise removal and S/N ratio improvement than 3D-RNA both on prestack migration and poststack migration data,which indicates that the volumeτ-ptransform is an effective approach for S/N ratio improvement.

关 键 词：体τ-p变换 OVT域 3D-RNA 地震数据处理 去噪 

分 类 号：P631[天文地球—地质矿产勘探]