物探化探计算技术2025，Vol.47Issue(4)：536-544,9.DOI:10.12474/wthtjs.20240410-0001
多方位网格层析技术在海洋OBN资料中的应用
Application of multi-azimuth grid tomography technology on marine OBN seismic data
摘要
Abstract
The development of velocity anomalies and fractures in subsurface media can result in directional anisotropy of the subsurface media.Multi-azimuth grid tomography can fully utilize offset gathers from different azimuth angles to perform tomographic inversion of the velocity field,effectively addressing the issue of azimuthal anisotropy in subsurface media and obtaining more accurate subsurface velocity fields.This approach also improves depth migration imaging,providing better seismic data for high-precision petroleum exploration.Since the widespread application of multi-azimuth grid tomography in the early 21st century,this technique has primarily been applied to onshore data in complex tectonic zones,resulting in significant improvements in the imaging of geological anomalies such as salt and volcanic rocks,and fractures.This study is the first to apply multi-azimuth grid tomography to marine OBN data,and during the application process,the structural trend of fracture development in the research area was investigated in advance,and the azimuth angles were divided based on the structural trend of fractures.The advantage of the OBN data with an aspect ratio of 1∶1 was fully utilized by discarding some far-offset seismic traces that formed a certain angle with the inline and crossline directions,thereby changing the distribution of shot-receiver offsets from a square to a circular shape,which made the coverage and offset distribution of the directional azimuthal gathers more consistent.Finally,after multi-azimuth grid tomography,the boundary between the metamorphic basement and the surrounding rocks in the research area was imaged more clearly and accurately,thereby improving the imaging accuracy of fractures and faults.The application of multi-azimuth grid tomography in similar marine data holds certain reference significance.关键词
宽(全)方位地震资料采集/速度异常体/裂缝构造/多方位网格层析/深度偏移/海洋OBN资料Key words
wide(full)azimuth seismic data acquisition/velocity anomalies/fractures structure/multi-azimuth grid tomography/depth migration/marine OBN data分类
天文与地球科学引用本文复制引用
王丙钢,丁成震,宋家文,宣瑞卿,耿辉,万学娟,刘涛然..多方位网格层析技术在海洋OBN资料中的应用[J].物探化探计算技术,2025,47(4):536-544,9.基金项目
中国石油天然气集团有限公司重大科技专项(2021DJ3401) （2021DJ3401）
东方地球物理公司项目(12-02-04-2023) （12-02-04-2023）
