We developed a modified topography prestack time migration (PSTM) scheme that can improve the imaging resolution by applying effective Q to topography migration. The computation of the traveltime at each imaging location in the migration is based on the floating datum smoothed by rugged topography. Unlike the common quality factor Q, the effective Q only determines the frequency-dependent amplitude and the traveltime at a single imaging location, which enables us to establish a Q model in an inhomogeneous medium. Hence, we can acquire the effective Q using a scanning technology according to the width of the frequency band and signal-to-noise ratio of the imaging gathers. The proposed migration method can be integrated into the conventional topography migration workflow. Synthetic and three-dimensional (3D) field datasets indicate that the proposed deabsorption PSTM from rugged topography is effective.

中文翻译：

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来自崎岖地形的解吸收叠前时间偏移

我们开发了一种改进的地形叠前时间偏移 (PSTM) 方案，该方案可以通过将有效 Q 应用于地形偏移来提高成像分辨率。偏移中每个成像位置的走时计算是基于经过崎岖地形平滑的浮动基准。与常见的品质因数 Q 不同，有效 Q 仅确定单个成像位置的频率相关振幅和走时，这使我们能够在非均匀介质中建立 Q 模型。因此，我们可以根据成像道集的频带宽度和信噪比，利用扫描技术获取有效Q值。所提出的偏移方法可以集成到传统的地形偏移工作流程中。