High-precision velocity tomography inversion in the depth domain

被引：0
|
作者：
Xu J. [1 ]
Zhou D. [1 ]
He D. [1 ]
Wang J. [1 ]
Bian L. [1 ]
机构：
[1] Bohai Oilfield Research Institute, Tianjin Branch, CNOOC, Tianjin
来源：
Xu, Jialiang (84829525@qq.com) | 2018年 / Science Press卷 / 53期
关键词：
Angle-domain common-imaging-point gather; Coherent inversion; Grid tomography; Interval velocity; Migration;
D O I：
10.13810/j.cnki.issn.1000-7210.2018.04.010
中图分类号：
学科分类号：
摘要：
The velocity field in the depth domain is the most important parameter of prestack depth migration, which directly determines the migration imaging accuracy. Conventional tomography velocity modeling methods consist of three parts. First, an initial interval velocity model is generated with Dix formula or horizon-constraint Dix formula. Then the initial velocity model is iterated by offset-domain gathers. Finally, the velocity model is modified by the grid tomography. In this paper, we improve the flow of conventional tomography velocity modeling. First an initial velocity model is established with the wave-equation coherent inversion. Then the tomography iteration is carried out by common-imaging-point gathers in the angle domain. Finally, the velocity model is locally modified by the grid tomography method based on horizon constraints. Experimental results of 3D data in the Block M, Bohai Sea show that the improved flow can greatly improve the interval-velocity field accuracy. © 2018, Editorial Department OIL GEOPHYSICAL PROSPECTING. All right reserved.
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页码：737 / 744
页数：7
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