Angle-domain common imaging gather extraction via Kirchhoff prestack depth migration based on a traveltime table in transversely isotropic media
Angle-domain common imaging gather extraction via Kirchhoff prestack depth migration based on a traveltime table in transversely isotropic media
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基于横观各向同性介质走时表的基尔霍夫叠前深度偏移角域共成像道集提取
DOI：
10.1088/1742-2140/aaa149
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发表时间：
2018-04
影响因子：
1.4
通讯作者：
Liu Dingjin
中科院分区：
文献类型：
--
作者：
Liu Shaoyong;Gu Hanming;Tang Yongjie;Han Bingkai;Wang Huazhong;Liu Dingjin
角域共像点集（ADCIGs）可以缓解共像点集在偏置域的局限性，广泛应用于速度反演和振幅随角度变化（AVA）分析。基于Kirchhoff叠前深度偏移（KPSDM）的行时梯度，提出了一种在横向各向同性（TI）介质中基于行时梯度生成ADCIGs的有效算法，因为TI介质中计算行时的动态规划方法不受阴影带和行时插值的限制。同时，我们提出了一种通过KPSDM提取ADCIG的具体实现策略。提出的策略包括三个主要步骤：(1)在TI介质中使用动态规划方法计算旅行时间；(2)基于行时表梯度计算慢度矢量；(3)迁移过程中照明矢量和地下角度的构建。数值算例证明了该方法的有效性，从而显示了其在后续层析速度反演和AVA中的潜在应用。
Angle-domain common image-point gathers (ADCIGs) can alleviate the limitations of common image-point gathers in an offset domain, and have been widely used for velocity inversion and amplitude variation with angle (AVA) analysis. We propose an effective algorithm for generating ADCIGs in transversely isotropic (TI) media based on the gradient of traveltime by Kirchhoff pre-stack depth migration (KPSDM), as the dynamic programming method for computing the traveltime in TI media would not suffer from the limitation of shadow zones and traveltime interpolation. Meanwhile, we present a specific implementation strategy for ADCIG extraction via KPSDM. Three major steps are included in the presented strategy: (1) traveltime computation using a dynamic programming approach in TI media; (2) slowness vector calculation by the gradient of a traveltime table calculated previously; (3) construction of illumination vectors and subsurface angles in the migration process. Numerical examples are included to demonstrate the effectiveness of our approach, which henceforce shows its potential application for subsequent tomographic velocity inversion and AVA.
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影响因子：
3.3
作者：
Jianguo Sun;Zhangqing Sun;Fuxing Han
通讯作者：
Jianguo Sun;Zhangqing Sun;Fuxing Han
VTI介质中的特征波分解与成像
影响因子：
2
作者：
Liu Shaoyong;Wang Huazhong;Feng Bo
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影响因子：
3.3
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通讯作者：
Qunshan Zhang;G. McMechan
影响因子：
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作者：
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通讯作者：
P. Sava;T. Alkhalifah
影响因子：
3.3
作者：
Jiubing Cheng;J. Geng;Huazhong Wang;Z. Ma
通讯作者：
Jiubing Cheng;J. Geng;Huazhong Wang;Z. Ma