石油物探2025，Vol.64Issue(3)：510-521,12.DOI:10.12431/issn.1000-1441.2023.0405
英雄岭深层高陡构造及断层下盘精细成像解决方案
A precise imaging solution for deep steep structures and foot walls in Yingxiongling structural belt
摘要
Abstract
Seismic data acquired in the Yingxiongling structural belt feature complex wave fields,severe scattered noises,and weak signals.The low-velocity layer and strong anisotropy are a huge challenge to the precise imaging of deep sub-salt structures.Owing to the occurrence of extremely thick evaporites and four large fault zones,it is hard to accurately image steeply dipping formations and faults without distortion.This paper proposes an integrated scheme of acquisition and processing for the precise imaging of deep steep structures and foot walls.The key geometry parameters for imaging are clarified based on forward modeling and the comparative study of field and modelled data.A target-oriented scheme for near-surface survey and the techniques of near-surface velocity modeling are established based on the quantitative analysis of shallow velocity influence on deep structure imaging.Guided by the velocity modeling from the"true"surface,a prestack depth migration velocity model for the precise imaging of foot walls is finally obtained through tomographic inversion of partial offset data and multi-azimuth grid tomography.The research suggests that:(1)wide azimuth and large offset can improve the reliability and accuracy of deep fault and basement imaging in the study area;(2)constrained tomographic inversion of partial offset data is a better solution to the modeling of the extremely thick near-surface layer with improved accuracy in mountainous areas;and(3)multi-azimuth grid tomography based on wide-azimuth seismic data can obtain a reasonable anisotropic velocity field of evaporites and foot walls for improved imaging of complex highly steep structures and foot walls.关键词
英雄岭构造带/高陡构造/断层下盘/宽方位/表层建模/网格层析Key words
Yingxiongling structural belt/highly steep structure/foot wall of fault/wide azimuth/near-surface modeling/grid tomography分类
能源科技引用本文复制引用
吴迪,章多荣,赵邦六,王绪本,吴永国,王海立..英雄岭深层高陡构造及断层下盘精细成像解决方案[J].石油物探,2025,64(3):510-521,12.基金项目
中国石油天然气股份有限公司重大科技项目"羌塘盆地油气地质综合研究与勘探关键技术攻关"课题"羌塘盆地高原地球物理勘探技术攻关"(2021DJ0804)和中国石油集团东方地球物理勘探有限责任公司重大科技专项"物探智能化关键技术研究"课题"地震采集关键技术及装备智能化研发"(01-04-01-2024)共同资助.This research is financially supported by the Major Science and Technology Project of PetroChina Company Limited(Grant No.2021DJ0804)and the Major Scientific and Technological Special Project of BGP Inc.(Grant No.01-04-01-2024). （2021DJ0804）
