石油物探2012，Vol.51Issue(5)：476-485,10.DOI:10.3969/j.issn.1000-1441.2012.05.009
各向异性克希霍夫叠前深度偏移
Research on Anisotropic Kirchhoff pre-stack depth migration
周巍 1王鹏燕 1杨勤勇 1方伍宝 1潘宏勋 1刘旭跃 1郭书娟1
作者信息
- 1. 中国石油化工股份有限公司石油物探技术研究院,江苏南京211103
- 折叠
摘要
Abstract
Along with the improvement of seismic exploration accuracy, the effect of anisotropy on conventional Kirchhoff pre-stack depth migration can't be ignored any more. Therefore, we studied the method of obtaining anisotropic parameters by using P-wave non-hyperbolic traveltime. The results show that P-wave traveltime information can be used to identify the anisotropic parameters of VTI media when seismic array length is much longer than the depth of the exploration target. Based on the CMP gathers from VTI media,we probed the two-step method for extracting the parameter. The first step is striking RMS NMO correction velocity by using short-array seismic data, and then applyin ghorizontal velocity scanning on long-array seismic data to get horizontal velocity, followed by conversion to get the anisotropy parameters. The second step is calculating travel time by anisotropic ray tracing based on the VTI media eikonal equation with acoustic approximation. Model and field data tests show that, the proposed method is workable to extract the anisotropy parameters,and is effective to improve the accuracy &. Quality of VTI anisotropic Kirchhoff pre-stack depth migration.关键词
各向异性参数/叠前深度偏移/速度分析/射线追踪/旅行时Key words
anisotropy parameters/ pre-stack depth migration/ velocity analysis/ray tracing/traveltime分类
天文与地球科学引用本文复制引用
周巍,王鹏燕,杨勤勇,方伍宝,潘宏勋,刘旭跃,郭书娟..各向异性克希霍夫叠前深度偏移[J].石油物探,2012,51(5):476-485,10.
