无拉伸双曲NMO  

Nonstretch hyperbolic NMO.

作　　者：余波[1] 徐婧[1] 黄中玉[1] 徐亦鸣[1] 

机构地区：[1]中国石化石油勘探开发研究院南京石油物探研究所,江苏南京210014

出　　处：《勘探地球物理进展》2005年第6期401-403,共3页Progress in Exploration Geophysics

摘　　要：在常规双曲动校算法的基础上,提出了基于反射波旅行时轨迹为双曲线形式的前提假设,推导出无拉伸的 双曲动校公式,同时产生新的动校拉伸因子。该因子与界面NMO速度、偏移距、界面自激自收旅行时,时移之 间建立了直接的定量关系,揭示出常规NMO过程不仅会使同相轴发生反转,而且还会加剧同相轴动校拉伸。 将该方法应用于合成CMP道集数据,与常规NMO相比,克服了常规动校拉伸现象,动校结果实现了“整体搬 家”,即使出现“鬼”轴现象,也可以借助循环采样中值滤波来消除干扰,最终实现无拉伸动校。This paper proposes a new expression of nostretch hyperbolic normal-moveout (NMO), which is based on hyperbolic reflection travel time. Quantitative relations between NMO velocity, offset, zero travel-time, and moveout were established. It was showed that conventional NMO might result in event reversal, or even amplify the stretches. Tests on synthetic CMP gathers show that the proposed method can achieve 'block move' , and the remaining noises can be eliminated by cycling sampled median filtering.

关 键 词：无拉伸 双曲线 NM0 循环采样中值滤波 

分 类 号：P631.422[天文地球—地质矿产勘探]