Q-estimation using seismic interferometry from vertical well data

Feng Cheng, Deyan Draganov, Jianghai Xia, Yue Hu, Jianhuan Liu

Research output: Contribution to journalArticleScientificpeer-review

6 Citations (Scopus)

Abstract

The Green's function between two receivers can be retrieved using seismic interferometry (SI) by cross-correlation, as if one of the receivers were a virtual seismic source. When the wavefields experience intrinsic losses during propagation, non-physical arrivals (ghosts) would appear in the retrieved result. These ghosts are a result of internal reflections inside the different layers lying between the subsurface sources and the receivers. Recent studies have introduced a stable method to monitor the layer-specific changes in quality factor (Q) using the ghosts retrieved by SI applied to a horizontal-well data. However, drilling a horizontal well is much more complicated and expensive than drilling a conventional vertical well. Because of this, we show here how the Q-estimation method introduced for the horizontal well can be adapted to monitor layer-specific changes of Q using a vertical well. In order to improve the accuracy of the Q-estimation, we propose a grid-searching method to detect the optimal effective Q. We illustrate our method using numerically modelling data from a horizontal and a vertical well.

Original languageEnglish
Pages (from-to)16-22
Number of pages7
JournalJournal of Applied Geophysics
Volume159
DOIs
Publication statusPublished - 1 Dec 2018

Keywords

  • Ghost reflection
  • Horizontal well
  • Intrinsic losses
  • Numerical modelling
  • Quality factor
  • Seismic interferometry
  • Vertical well

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