偏移距域/角度域共成像点道集与偏移速度的关系

刘守伟; 程玖兵; 王华忠; 马在田

偏移距域/角度域共成像点道集与偏移速度的关系

同济大学海洋与地球科学学院, 上海 200092

基金项目:

国家863研究计划项目 2006AA09Z323

国家自然科学基金项目 40504016

详细信息

作者简介:
刘守伟(1978-), 男, 博士研究生, 从事波动方程偏移成像及速度分析等方面的研究工作.E-mail: liushouwei@126.com

中图分类号: P631.4
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- 被引次数: 0
出版历程
- 收稿日期: 2007-02-10
- 刊出日期: 2007-07-25

Relationships between Offset Domain/Angle Domain Common Image Gathers and Migration Velocity

School of Ocean and Earth Science, Tongji Universtiy, Shanghai 200092, China

摘要

摘要: 为了得到波动方程偏移距域共成像点道集(ODCIGs) 和角度域共成像点道集(ADCIGs) 与偏移速度的关系, 在匀速单层水平反射情况下, 对ODCIGs和ADCIGs随偏移速度的变化进行了定量的推导, 得到偏移速度偏小时ODCIGs与半偏移距成双曲关系, 反之成椭圆关系; 结合深度聚焦分析, 得到偏移速度偏大时, ADCIGs中视入射角大于真入射角, 反之, 小于真入射角; 在速度偏小时, ADCIGs上剩余时差(RMO) 与视入射角的正切值成椭圆关系, 反之成双曲关系.在地震有效入射角度范围内, ADCIGs对于偏大的偏移速度更加敏感.在偏移速度分析(MVA) 中, 从稍大的速度开始分析会对速度分析更加有利.
- 偏移距域共成像点道集 /
- 角度域共成像点道集 /
- 剩余时差 /
- 偏移速度分析
Abstract: In order to probe the relationships between wave equation offset domain common image gathers (ODCIGs) /angle domain common image gathers (ADCIGs) with migration velocity, we quantitatively derive the changes of ODCIGs and ADCIGs along with migration velocity on the assumption of uniform velocity medium with a horizontal reflector. We come to conclusion that ODCIGs are hyperbolas with half offset; on the contrary, they are ellipses. Combined with the results of depth focusing analysis, we find the apparent incident angles in ADCIGs are larger than the real incident angles when the migration velocity is larger than the true one and vice versa. With lower migration velocity, the residual moveout (RMO) on ADCIGs is an ellipse with the tangent of apparent incident angle; otherwise, it′s a hyperbola. In the valid seismic incident angle, ADCIGs are much more sensitive to the higher migration velocity. As to migration velocity analysis (MVA), it is suggested to start with a little higher initial velocity.
- offset domain common image gathers /
- angle domain common image gathers /
- residual moveout /
- migration velocity analysis

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图 1 水平反射(a)、非零偏移距成像(b) 及偏移速度偏小时成像(c) 示意图

Fig. 1. Sketch of horizontal reflection (a), non-zero offset imaging (b) and imaging with lower migration velocity (c)

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图 1 水平反射(a)、非零偏移距成像(b) 及偏移速度偏小时成像(c) 示意图

Fig. 1. Sketch of horizontal reflection (a), non-zero offset imaging (b) and imaging with lower migration velocity (c)

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图 2 RMO与偏移速度误差关系

Fig. 2. Relationship between RMO and migration velocity error

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图 2 RMO与偏移速度误差关系

Fig. 2. Relationship between RMO and migration velocity error

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图 3 匀速模型成像剖面和不同偏移速度得到的ODCIGs

a.成像剖面; b. 90%模型速度: c. 100% 模型速度; d. 110%模型速度

Fig. 3. Velocity model and imaging section and ODCIGs gained with different migration velocities

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图 3 匀速模型成像剖面和不同偏移速度得到的ODCIGs

a.成像剖面; b. 90%模型速度: c. 100% 模型速度; d. 110%模型速度

Fig. 3. Velocity model and imaging section and ODCIGs gained with different migration velocities

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图 4 不同偏移速度得到的ADCIGs

a.90%模型速度; b. 100%模型速度; c. 110% 模型速度

Fig. 4. ADCIGs gained with different migration velocities

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图 4 不同偏移速度得到的ADCIGs

a.90%模型速度; b. 100%模型速度; c. 110% 模型速度

Fig. 4. ADCIGs gained with different migration velocities

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图 5 大庆模型成像剖面

a. 成像剖面; b. 90%模型速度; c. 100% 模型速度; d. 110% 模型速度

Fig. 5. Daqing model imaging section and ODCIGs gained with different migration velocities of Daqing model

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图 5 大庆模型成像剖面

a. 成像剖面; b. 90%模型速度; c. 100% 模型速度; d. 110% 模型速度

Fig. 5. Daqing model imaging section and ODCIGs gained with different migration velocities of Daqing model

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图 6 大庆模型中不同偏移速度得到的ADCIGs

a. 90% 模型速度; b. 100% 模型速度; c. 110% 模型速度

Fig. 6. ADCIGs gained with different migration velocities of Daqing model

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图 6 大庆模型中不同偏移速度得到的ADCIGs

a. 90% 模型速度; b. 100% 模型速度; c. 110% 模型速度

Fig. 6. ADCIGs gained with different migration velocities of Daqing model

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