True-amplitude prestack depth migration
True-amplitude prestack depth migration
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DOI：
10.1190/1.2714334
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发表时间：
2007-04
期刊：
影响因子：
3.3
通讯作者：
Feng Deng;G. McMechan
中科院分区：
文献类型：
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作者：
Feng Deng;G. McMechan
目前大多数真振幅偏移只对几何扩展进行校正。我们提出了一种新的叠前深度偏移方法，使用逆时偏移的框架来补偿几何扩展，固有Q损失和传输损失。几何扩展通过完全双向波传播进行隐式补偿。固有Q损失通过在波动方程中包括Q依赖项来处理。透射损失补偿的基础上的角度依赖的反射率使用两个通过递归逆时叠前偏移的估计。所使用的图像条件是接收器/源波场振幅的比率。利用倾斜层模型和盐模型的合成数据进行的二维试验表明，损失补偿叠前深度偏移可以在目标处产生可靠的与角度相关的反射系数。反射系数曲线拟合，以给出目标处速度比的最小二乘估计。主要的新结果是一个程序...
Most current true-amplitude migrations correct only for geometric spreading. We present a new prestack depth-migration method that uses the framework of reverse-time migration to compensate for geometric spreading, intrinsic Q losses, and transmission losses. Geometric spreading is implicitly compensated by full two-way wave propagation. Intrinsic Q losses are handled by including a Q -dependent term in the wave equation. Transmission losses are compensated based on an estimation of angle-dependent reflectivity using a two-pass recursive reverse-time prestack migration. The image condition used is the ratio of receiver/source wavefield amplitudes. Two-dimensional tests using synthetic data for a dipping-layer model and a salt model show that loss-compensating prestack depth migration can produce reliable angle-dependent reflection coefficients at the target. The reflection coefficient curves are fitted to give least-squares estimates of the velocity ratio at the target. The main new result is a procedure ...