Subsurface Velocity Determination By Grid Tomography of Depth Migrated Gathers

Subsurface Velocity Determination By Grid Tomography of Depth Migrated Gathers
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通过深度偏移聚集的网格层析成像确定地下速度

DOI:
10.1190/1.1885789
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发表时间:
1997
期刊:
Seg Technical Program Expanded Abstracts
影响因子:
--
通讯作者:
Z. Koren
Z. Koren
中科院分区:
--
文献类型:
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作者:
D. Kosloff;Uri I. Zackhem;Z. Koren

文献摘要

被引文献

相似文献

地下层速度的确定对于叠前偏移成像、AVO研究和全波形反演具有重要意义。本文提出了一种直接利用深度偏移道集而不需要深度模型的方法。该方法是基于层位的层析成像的补充。当可以识别地下模型时,基于模型的层析成像似乎是合适的,因为它产生地质约束的更新。然而,如果最初不能确定深度模型,则基于网格的方法是可取的,其中可以在不建立深度模型的情况下更新层速度剖面。
SUMMARY Determination of subsurface interval velocity is important for imaging by prestack migration, AVO studies and full waveform inversion. We propose a method which uses depth migrated gathers directly, and does not necessarily need a depth model. The approach is complementary to horizon based tomography. When a subsurface model can be identified, model-based tomography seems appropriate since it produces geologically constrained updates. However, if no depth model can be determined initially, a grid based approach is advisable, where one can update an interval velocity section without building a depth model.