高陡背斜地震剖面高点偏离问题分析及其校正  

Analysis of height departure and its correction in seismic section with high dipping anticline.

作　　者：梁顺军[1] 梁顺彬 

机构地区：[1]四川石油管理局地调处物探研究中心

出　　处：《石油地球物理勘探》2001年第1期105-114,共10页Oil Geophysical Prospecting

摘　　要：高陡背斜的地震高点在地震剖面上普遍存在着偏离畸变现象。本文从实际资料出发 ,以高陡背斜速度模型为基础 ,分析了引起地震高点偏离的原因及偏离规律 ;归纳并分析了影响地震高点偏离距离的 4个因素 (背斜不对称性、埋藏深度、速度和射线传播路径 ) ;并推导出了地震高点偏离距离公式。为了校正地震高点偏离 ,作者提出了“下倾偏移”概念 ,并用模型正、反演结果和实例加以阐述。本文最后提出 ,叠前深度偏移方法是校正地震高点偏离的一种好的方法 ,但最终效果取决于处理。Distortion phenomenon for deviated seismic height in high dipping anticline widely existed in seismic section. Based on velocity model with high dipping anticline and started from real data, the paper analyzed the causes causing seismic height departure and its rule, summarized and analyzed four factors affecting departure distance of seismic height (non symmetrical degree of anticline, burial depth, velocity and ray traveling path), and deduced departure distance formula of seismic height. The authors put forward a conception of “downdip direction migration” for correcting seismic height departure and use forward, inverse model and real data to explain it. The paper finally points out that prestack depth migration is good method for correcting seismic height departure, but final results depend on processing and on an understanding level of seismic height departure phenomenon by interpreter.

关 键 词：背斜 地震剖面 叠前深度偏移 速度模型 传播路径 埋藏深度 反演 问题分析 距离公式 实际 

分 类 号：TE121.1[石油与天然气工程—油气勘探] P631[天文地球—地质矿产勘探]