The data-driven Marchenko method is able to redatum wavefields to arbitrary locations in the subsurface, and can, therefore, be used to isolate zones of specific interest. This creates a new reflection response of the target zone without interference from over- or underburden reflectors. Consequently, the method is well suited to obtain a clear response of a subsurface reservoir, which can be advantageous in time-lapse studies. The isolated responses of a baseline and monitor survey can be more effectively compared; hence, the retrieval of time-lapse characteristics is improved. This research aims to apply Marchenko-based isolation to a time-lapse marine data set of the Troll field in Norway in order to acquire an unobstructed image of the primary reflections and retrieve small time-lapse traveltime difference in the reservoir. It is found that the method not only isolates the primary reflections but can also estimate internal multiples outside the recording time. Both the primaries and the multiples can then be utilized to find time-lapse traveltime differences. More accurate ways of time-lapse monitoring will allow for a better understanding of dynamic processes in the subsurface, such as observing saturation and pressure changes in a reservoir or monitoring underground storage of hydrogen and CO₂.

中文翻译：

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Marchenko 方法在 Troll 场上的延时应用

数据驱动的 Marchenko 方法能够将波场重新定位到地下的任意位置，因此可以用于隔离特定感兴趣的区域。这会产生目标区域的新反射响应，而不会受到上层或下层反射器的干扰。因此，该方法非常适合获得地下储层的清晰响应，这在时移研究中是有利的。可以更有效地比较基线调查和监测调查的孤立响应；因此，改善了延时特征的检索。本研究旨在将基于 Marchenko 的隔离应用于挪威 Troll 油田的延时海洋数据集，以获得无遮挡的一次反射图像并反演水库中的微小延时走时差。结果发现，该方法不仅可以隔离一次反射，还可以估计记录时间之外的内部多次波。然后可以利用一次波和多次波来查找延时旅行时间差异。更准确的延时监测方法将有助于更好地了解地下的动态过程，例如观察储层中的饱和度和压力变化或监测氢和CO ₂的地下储存。