A new method for wide-angle reflection normal moveout correction with high precision

被引：0
|
作者：
Liu X. [1 ]
Gao E. [1 ]
Ding L. [1 ]
He Y. [2 ]
Xue Y. [2 ]
Liu W. [3 ]
机构：
[1] Department of Earthquake Science, Institute of Disaster Prevention, Sanhe, 065201, Hebei
[2] BGP Geological Research Center, CNPC, Zhuozhou, 072751, Hebei
[3] School of Petroleum Geophysical Exploration, BGP Inc., CNPC, Zhuozhou, 072751, Hebei
来源：
Gao, Ergen (gaoergen@126.com) | 1600年 / Science Press卷 / 51期
关键词：
Horizontal layered medium; Normal moveout correction; Offset division; Wide-angle reflection;
D O I：
10.13810/j.cnki.issn.1000-7210.2016.05.008
中图分类号：
学科分类号：
摘要：
First based on traveltime-to-distance equation of horizontal multilayered media, we differentiate all-order derivatives of travel time t with respect to offset x near the shot point, and substitute the result into truncated Taylor's expansion for travel time t. A six order polynomial equation near the shot point is obtained. Then, we get the approximate formula of wide-angle reflection normal moveout correction under long-offset conditions by analyzing characteristics of relational equations. Finally, we discuss theoretically application conditions of the six order polynomial and the approximate formula. Based on our numerical simulations, the proposed normal moveout correction method can control the relative error rate of traveltime within 1% when offset is more than 4 times of depth, and it can stretch seismic events at near and far offsets. Therefore, this method may be used as a high precision method for wide-angle reflection normal moveout correction. © 2016, Editorial Department OIL GEOPHYSICAL PROSPECTING. All right reserved.
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页码：894 / 900
页数：6
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