物探与化探2024，Vol.48Issue(3)：698-704,7.DOI:10.11720/wtyht.2024.1227
黄土塬地区双井微测井近地表Q模型的求取及应用
The calculation and application of a near-surface Q-value model based on dual-well micrologs for a loess tableland area
摘要
Abstract
Given the low resolution and poor wavelet coherence of seismic data for the loess tableland area of the Ordos Basin,this study proposed a method for calculating the near-surface Q-value model for near-surface Q-absorption compensation of seismic data.In-vestigations reveal that micrologs have been used to obtain the Q field of a whole survey area by calculating the Q value and subsequent interpolation.Based on previous research results,this study calculated the Q values of well sites and near-surface velocity values using dual-well micrologs.Then,the regional relationship function between near-surface velocity and Q was determined through fitting using the least squares method.Furthermore,the near-surface Q field of the study area was obtained using the near-surface velocity field de-rived from the tomographic inversion of the first arrival wave post basic static correction.Consequently,the near-surface Q field of the whole survey area were calculated from the Q values of microlog positions,and the near-surface Q absorption compensation of prestack gathers was achieved.As indicated by the application of the study area's seismic data,which are characterized by complex surface and subsurface conditions,the inversion of the Q field for near-surface Q absorption compensation using the method proposed in this study can effectively enhance the wavelet coherence of seismic data,broaden the frequency band,improve the log-seismic matching relation-ship,and eliminate the influence of near surface on seismic wavelets.关键词
黄土塬/双井微测井/Q吸收补偿/子波一致性Key words
loess tableland/dual-well microlog/Q-absorption compensation/wavelet coherence分类
天文与地球科学引用本文复制引用
夏常亮,戴海涛,李国强,古发明,吴德明,韩利..黄土塬地区双井微测井近地表Q模型的求取及应用[J].物探与化探,2024,48(3):698-704,7.基金项目
中石油集团公司"十四五"科技项目(2021DJ3705) （2021DJ3705）
