Reverse time migration (RTM) is a powerful seismic imaging tool that suffers from high computational complexity when dealing with massive data. The simultaneous-shot method can effectively reduce the amount of migration by assembling several sources, although it adds crosstalk noise, which seriously affects the quality of the RTM results. To avoid this problem, we have adopted a time-domain scheme that combines time-delay encoding and amplitude encoding to reduce crosstalk artifacts in simultaneous-source imaging results. This scheme modulates the wavefields of multiple sources to fit the wavefield of a suspended super-virtual shot (SVS), which can eliminate crosstalk artifacts because they are absent in single SVS migration. Numerical examples on a steeply dipping model and the 2D SEG/EAGE salt model show the feasibility of the proposed method. SVS encoding can generate a qualified imaging result and takes less time than plane-wave encoding in the migration process.

中文翻译：

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一种高效的多源反向时间迁移的超虚拟镜头编码方案

逆时偏移（RTM）是一种功能强大的地震成像工具，在处理海量数据时会遭受很高的计算复杂度。尽管同时发声方法会增加串扰噪声，但它会严重影响RTM结果的质量，尽管可以增加多个串扰噪声，但可以通过组装多个源来有效地减少迁移量。为避免此问题，我们采用了时域方案，该方案结合了时延编码和幅度编码，以减少同时源成像结果中的串扰伪像。此方案可调制多个源的波场以适合悬浮的超虚拟发射（SVS）的波场，由于单个SVS迁移中不存在串扰伪像，因此可以消除串扰伪像。陡倾模型和2D SEG / EAGE盐模型的数值例子表明了该方法的可行性。