@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 = {<p style="text-align: justify;">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.</p>},
issn = {1991-7120},
doi = {https://doi.org/10.4208/cicp.OA-2018-0247},
url = {http://global-sci.org/intro/article_detail/cicp/16951.html}
}