Kirchhoff prestack time migration for ocean bottom seismic data

被引：0
|
作者：
Wang S. [1 ]
Qian Z. [1 ]
Wang C. [1 ]
Zhao C. [1 ]
Kou Q. [1 ]
Zhang J. [1 ]
机构：
[1] Research and Development Center, BGP Inc., CNPC, Zhuozhou, 072751, Hebei
来源：
Shiyou Diqiu Wuli Kantan/Oil Geophysical Prospecting | 2019年 / 54卷 / 03期
关键词：
Down-going wave; Mirror image; Ocean bottom cable (OBC); Ocean bottom node (OBN); Ocean bottom seismic (OBS); Up-going wave;
D O I：
10.13810/j.cnki.issn.1000-7210.2019.03.007
中图分类号：
学科分类号：
摘要：
The ocean bottom seismic (OBS) acquisition includes two ways of acquisition, i.e.ocean bottom cable (OBC) and ocean bottom node (OBN). Because shot points are located in the sea surface and receivers are placed in the sea bottom, the assumptions of traditional seismic imaging, which is based on the same datum, is no longer adapt to the OBS data. So we propose in the paper the Kirchhoff prestack time migration for ocean bottom seismic data. First the calculation formula of the travel of down-going and up-going waves from reflection points are derived, and graphs show directly the coverage range of their respective common-receiver-point gathers data. Then using the mirror imaging theory as a guidance, the calculation formulas of travel time of down-going and up-going waves for Kirchhoff time migration are given, and conversion methods between imaging time corrections and RMS velocity in the formulas are clearly specified. Finally, the calculation formula of OBS seismic prestack time migration weighted function is described. © 2019, Editorial Department OIL GEOPHYSICAL PROSPECTING. All right reserved.
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页码：551 / 557
页数：6
相关论文
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