石油物探2024，Vol.63Issue(1)：170-181,12.DOI:10.12431/issn.1000-1441.2024.63.01.015
消除全局层析反演累计误差的反向递推方法
A backward recurrence method to eliminate cumulative errors of global tomographic inversion
摘要
Abstract
The conventional tomographic inversion calculates the depth errors based on residual curvatures of gathers and ignores the accu-mulation of depth errors from top to bottom.Cumulative error increases with depth,which affects depth positions of horizons on prestack depth migration profiles obtained using the updated velocity field.Based on the principle of curvature depth error accumulation,a recursive equation is formulated to eliminate cumulative errors layer by layer from bottom to top,and horizon picking is updated according to depth residuals.Residual time differences are calculated by using the residual curvatures of common imaging-point gathers in the angle domain,and the relation between incident angle and interval velocity derived from the Snell's law is used to calculate incident angles and eliminate cumulative errors for horizon updating.Model tests and field data application prove the feasibility and effectiveness of the proposed method.Compared with conventional tomographic inversion methods,the new method effectively improves the overall accuracy and efficiency to in-vert the velocity model for subsequent prestack depth migration.关键词
层析反演/剩余时差/累计误差/角道集/偏移成像/层位更新Key words
tomographic inversion/residual time difference/cumulative error/ADCIGs/migration/horizon updating分类
天文与地球科学引用本文复制引用
薛冈,熊鹰杰,孟庆利,单中强,云惠芳,杨帆..消除全局层析反演累计误差的反向递推方法[J].石油物探,2024,63(1):170-181,12.基金项目
中国石化科技部项目"四川盆地及周缘常压页岩气勘探开发关键技术研究"(P21087)资助.This research is financially supported by the Sinopec Science and Technology Department Project(Grant No.P21087). （P21087）
