石油地球物理勘探2023，Vol.58Issue(6)：1365-1373,9.DOI:10.13810/j.cnki.issn.1000-7210.2023.06.008
基于虚反射走时和道集相干联合的电缆等浮校正方法
Method of cable floating correction based on combination of gather coherence and ghost reflection traveltime
摘要
Abstract
In the high-resolution and small trace distance marine acquisition,due to the inherent problems of equip-ment,the cable unequal floating effect will be caused,there are some problems,for instance,phase axistremor and uneven NMO correction will be shown on the gather,which cannot achieve the effect of in-phase superposition,and reduce the imaging accuracy of seismic data.The conventional residual moveout correction method is difficult to accurately identify whether residual moveout is caused by the unequal floating of the cable,which will cause errors in the correction results.This paper presents a cable floating correction method based on combination of gather coherence and ghost reflection traveltime.Firstly,the sinking depth of the actual cable is calculated by using the interactive pick-up ghost reflection travel time,and then the initial moveout correction is obtained.Then the reference moveout cor-rection is obtained by the gather coherence and the model reference trace.Finally,the moveout correction is weighted selected by the cross-correlation analysis between the two,and the moveout is applied after smoothing,the phase axis of the data achieves the effect of phase stacking,in order to improve the resolution and imaging accuracy of seismic data.In this paper,combined with the test analysis of model data and actual processing,compared with the conven-tional cross-correlation cable float correction method,the results show that the correction method in this paper is more accurate and effective in float correction.关键词
小道距采集/电缆等浮校正/剩余时差/互相关分析/虚反射走时Key words
small distance acquisition/cable float correction/residual moveout/cross correlation analysis/ghost re-flection traveltime分类
地质学引用本文复制引用
颜中辉,王小杰,徐华宁,陈珊珊,杨佳佳,杨传胜..基于虚反射走时和道集相干联合的电缆等浮校正方法[J].石油地球物理勘探,2023,58(6):1365-1373,9.基金项目
本项研究受国家自然科学基金项目"基于多分辨HHT时频分析的南黄海中深层弱地震反射补偿研究"(42106208)和"东海陆架盆地长排列地震数据高精度叠前逆时深度偏移成像"(42106207)、山东省自然科学面上基金项目"跨频段融合天然气水合物储层检测研究"(ZR2021MD118)和"东海陆架及邻域海底流体渗漏系统的识别及其形成机制研究"(ZR202111260092)、崂山实验室科技创新项目"中国海域重点盆地发育时空差异及其深部过程"(LSKJ202203401)以及中国地质调查局项目"深海调查—测量"(DD20230643、DD20191003)联合资助. （42106208）
