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Volume 28, Issue 2
A Bipolar-Bisection Piecewise Encoding Scheme for Multi-Source Reverse Time Migration

Xiaofeng Jia, Bin Chen & Qihua Li

Commun. Comput. Phys., 28 (2020), pp. 723-742.

Published online: 2020-06

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  • Abstract

Conventional shot-record reverse time migration (RTM) suffers from a high computational burden when dealing with massive data. The computational cost of RTM can be reduced by shot-encoding techniques, and plane-wave encoding is a commonly used and effective shot-encoding scheme. However, plane-wave encoding requires long time padding to avoid information loss, which decreases the efficiency of the time-domain wavefield extrapolator, and the time padding becomes longer with the increasing distance between multiple sources. The piecewise plane-wave encoding scheme cuts multiple sources into several segments prior to implementing plane-wave encoding, hence reduces the time padding, but brings new crosstalk due to the mutual interference between shots in different source segments. We suppress the crosstalk artifacts by a new bipolar-bisection amplitude encoding method, in which half of the encoding array of each migration is different from that of any other migrations to reduce the number of crosstalk terms with as few migrations as possible. We embed the bipolar-bisection method into piecewise plane-wave encoding. Compared with plane-wave encoding, the proposed scheme requires considerably shorter time padding and thus works more efficiently and can generate a qualified imaging result. The feasibility of the proposed method is tested on the 2D SEG/EAGE salt model and the Marmousi model.

  • AMS Subject Headings

86-08, 86A15, 86A20

  • Copyright

COPYRIGHT: © Global Science Press

  • Email address

binchen_0616@yahoo.com.cn (Bin Chen)

  • BibTex
  • RIS
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@Article{CiCP-28-723, author = {Jia , XiaofengChen , Bin and Li , Qihua}, title = {A Bipolar-Bisection Piecewise Encoding Scheme for Multi-Source Reverse Time Migration}, journal = {Communications in Computational Physics}, year = {2020}, volume = {28}, number = {2}, pages = {723--742}, abstract = {

Conventional shot-record reverse time migration (RTM) suffers from a high computational burden when dealing with massive data. The computational cost of RTM can be reduced by shot-encoding techniques, and plane-wave encoding is a commonly used and effective shot-encoding scheme. However, plane-wave encoding requires long time padding to avoid information loss, which decreases the efficiency of the time-domain wavefield extrapolator, and the time padding becomes longer with the increasing distance between multiple sources. The piecewise plane-wave encoding scheme cuts multiple sources into several segments prior to implementing plane-wave encoding, hence reduces the time padding, but brings new crosstalk due to the mutual interference between shots in different source segments. We suppress the crosstalk artifacts by a new bipolar-bisection amplitude encoding method, in which half of the encoding array of each migration is different from that of any other migrations to reduce the number of crosstalk terms with as few migrations as possible. We embed the bipolar-bisection method into piecewise plane-wave encoding. Compared with plane-wave encoding, the proposed scheme requires considerably shorter time padding and thus works more efficiently and can generate a qualified imaging result. The feasibility of the proposed method is tested on the 2D SEG/EAGE salt model and the Marmousi model.

}, issn = {1991-7120}, doi = {https://doi.org/10.4208/cicp.OA-2018-0247}, url = {http://global-sci.org/intro/article_detail/cicp/16951.html} }
TY - JOUR T1 - A Bipolar-Bisection Piecewise Encoding Scheme for Multi-Source Reverse Time Migration AU - Jia , Xiaofeng AU - Chen , Bin AU - Li , Qihua JO - Communications in Computational Physics VL - 2 SP - 723 EP - 742 PY - 2020 DA - 2020/06 SN - 28 DO - http://doi.org/10.4208/cicp.OA-2018-0247 UR - https://global-sci.org/intro/article_detail/cicp/16951.html KW - Reverse time migration, crosstalk artifacts, shot encoding, computational efficiency. AB -

Conventional shot-record reverse time migration (RTM) suffers from a high computational burden when dealing with massive data. The computational cost of RTM can be reduced by shot-encoding techniques, and plane-wave encoding is a commonly used and effective shot-encoding scheme. However, plane-wave encoding requires long time padding to avoid information loss, which decreases the efficiency of the time-domain wavefield extrapolator, and the time padding becomes longer with the increasing distance between multiple sources. The piecewise plane-wave encoding scheme cuts multiple sources into several segments prior to implementing plane-wave encoding, hence reduces the time padding, but brings new crosstalk due to the mutual interference between shots in different source segments. We suppress the crosstalk artifacts by a new bipolar-bisection amplitude encoding method, in which half of the encoding array of each migration is different from that of any other migrations to reduce the number of crosstalk terms with as few migrations as possible. We embed the bipolar-bisection method into piecewise plane-wave encoding. Compared with plane-wave encoding, the proposed scheme requires considerably shorter time padding and thus works more efficiently and can generate a qualified imaging result. The feasibility of the proposed method is tested on the 2D SEG/EAGE salt model and the Marmousi model.

Xiaofeng Jia, Bin Chen & Qihua Li. (2020). A Bipolar-Bisection Piecewise Encoding Scheme for Multi-Source Reverse Time Migration. Communications in Computational Physics. 28 (2). 723-742. doi:10.4208/cicp.OA-2018-0247
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