基于旅行时梯度场的Kirchhoff PSDM角度道集生成方法研究

Saved in:

Bibliographic Details
Published in	应用地球物理：英文版 Vol. 12; no. 1; pp. 64 - 72
Main Author	刘少勇王华忠刘太臣胡英张才
Format	Journal Article
Language	English
Published	2015
Subjects	Kirchhoff叠前深度偏移偏移距域共成像点道集角度域共成像点道集速度分析
Online Access	Get full text
ISSN	1672-7975 1993-0658

Cover

More Information
Bibliography:	Angle-domain common-image gathers（ADCIGs） are the basic data in migration velocity analysis（MVA） and amplitude variation with angle（AVA） analysis. We propose a common-angle gather-generating scheme using Kirchhoff PSDM based on the traveltime gradient field. The scheme includes three major operations：（1） to calculate the traveltime field of the source and the receiver based on the dynamic programming approach;（2） to obtain the refl ection angle according to the traveltime gradient field in the image space; and（3） to generate the ADCIGs during the migration process. Because of the computation approach, the method for generating ADCIGs is superior to conventional ray-based methods. We use the proposed ADCIGs generation method in 3D large-scale seismic data. The key points of the method are the following.（1） We use common-shot datasets for migration,（2） we load traveltimes based on the shot aperture, and（3） we use the MPI and Open Mp memory sharing to decrease the amount of input and output（I/O）. Numerical examples using synthetic data suggest that the ADCIGs improve the quality of the velocity and the effectiveness of the 3D angle-gather generation scheme. 11-5212/O ADCIGs; Kirchhoff prestack depth migration; angle domain; common-image gathers; migration velocity analysis Liu Shao-Yong;Wang Hua-Zhong;Liu Tai-Chen;Hu Ying;Zhang Cai （1. School of Ocean and Earth Sience, Tongji University, Shanghai 200092, China. 2. Research Institute of Petroleum Exploration ＆ Development, PetroChina, Beijing 100083, China.）
ISSN:	1672-7975 1993-0658