公开(公告)号：US20080106971A1

公开(公告)日：2008-05-08

申请号：US11879926

申请日：2007-07-19

Applicant: Bin Wang ,  Francois Audebert

Inventor： Bin Wang ,  Francois Audebert

IPC: G01V1/28 ,  G01V1/38

CPC classification number: G01V1/303

Abstract: A low-cost general method to perform subsalt velocity analysis is provided. For instances where sediment velocity structure is relatively simple, the method includes a single one-time redatuming to the base of salt, using existing prestack wave equation tools. For instances where the sediment velocity structure has a variable topography, the method includes multi-step redatuming to the base of salt. The method is designed to completely remove the salt-sediment overburden effects, and redatum the surface seismic data to a flat arbitrary subsalt datum, removing the complexity of the wavefield caused by the salt bodies. Once having obtained a simplified wavefield by stripping off the effects of the complex overburden, less expensive Kirchhoff imaging algorithms are employed for performing subsalt velocity model building.

Abstract translation: 提供了一种执行子速度分析的低成本通用方法。 对于泥沙速度结构相对简单的情况，该方法包括使用现有的叠前波方程工具对盐基进行单次一次性重绘。 对于沉积物速度结构具有可变地形的情况，该方法包括多步地向盐的基底进行重新排列。 该方法旨在完全消除盐沉积物上覆层的影响，并将地表地震数据转换为平坦的任意盐点数据，消除盐体引起的波场复杂性。 一旦通过剥离复杂覆盖层的影响获得了简化的波场，则采用较便宜的基尔霍夫成像算法来执行亚速度模型建立。