基于非稳态匹配的角度域叠前道集去调谐方法  

A non-stationary match method for detuning pre-stack seismic gather in incident angle domain

作　　者：赵小龙 吴国忱[1,2] 

机构地区：[1]中国石油大学(华东)地球科学与技术学院,山东青岛266580 [2]海洋国家实验室海洋矿产资源评价与探测技术功能实验室,山东青岛266071

出　　处：《物探与化探》2017年第1期141-146,共6页Geophysical and Geochemical Exploration

基　　金：国家重点基础研究发展计划("973"计划)重大专项(2013CB228604);国家自然科学基金-石油化工基金联合重点项目(U1562215)

摘　　要：地层调谐效应改变了不同偏移距处反射波的干涉模式,使得远偏移距数据振幅和频率信息发生畸变,将会降低AVO/AVA分析及反演的置信度和分辨率。文中首先给出了调谐作用下反射波合成记录,通过正演模拟说明了调谐对叠前道集的影响。考虑到不同地层厚度下调谐效应的差异性,借助局域Lamoureux窗实现地震数据的自适应分解,利用角度数据之间的差异,构建了角度域地震数据的非平稳匹配目标函数,形成了非平稳匹配去调谐方法,实现了叠前道集的振幅和波形拉伸校正。本文方法在实际应用中取得了较好的效果,能够有效地改善大角度地震数据品质,为储层预测与流体识别奠定了数据基础。Under the layer tuning effects, the interference patterns are changing with different offsets of seismic reflections and, as a re- sult,the amplitude and frequency infor^nation is distorted,and this will worsen the confidence and resolution of the AVO/AVA analysis and inversion.Firstly,the authors gave the seismic reflection equations with tuning effects,with the modeling examples illustrating char-acteristics of the tuned seismic gather.Secondly,in consideration of the different detuning levels caused by the changing layer-thickness, the authors constructed the self-adaptive non-stationary decomposition via local Lamoureux time window.Finally,the authors built the non-stationary cost function for matching seismic angle gather to correct the amplitude and waveform stretch.Field application demon-strates the feasibility of the proposed method in improving the quality of seismic data with larger angle,with the high-quality data cau-sing the success of reseryoir prediction and hydrocarbon identification.

关 键 词：调谐效应 波形拉伸 非稳态分解 匹配算子 

分 类 号：P631.4[天文地球—地质矿产勘探]