摘要:
偏移是一种提高地震资料空间分辨率的方法,它使倾斜反射界面归位,绕射波收敛。对偏移成像技术的研究现状进行了总结,包括主要的偏移方法(二维与三维偏移、叠后与叠前偏移、时间与深度偏移)和算法(克希霍夫积分偏移、频率波数域偏移、有限差分偏移);讨论了偏移成像技术的发展趋势,包括各向异性偏移、粘弹性偏移、真振幅偏移、速度综合建模及复杂地形条件下成像问题;并通过一个叠前深度偏移成像的实例验证了新技术在复杂构造条件下有很好的应用效果。
Abstract:
Migration imaging is a method to improve the resolution of seismic data, it may recover the inclined reflection interface to its original position, and converge the diffraction wave. In this article we first summarize the status of the migration image technology, including 2D/3D migration, post-stack and pre-stack migration, time/depth migration, and algorithm, including Kirchhoff migration, frequency wave-number migration and finite difference migration. Then we discussed the development trend of migration image technology, including TTI migration, viscoelasticity migration, true amplitude migration, comprehensive velocity modeling and complex stratigraphic imaging. Finally a case using beam migration imaging method was introduced to the efficiency of the new imaging method.
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