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 language | English |
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Pages (from-to) | 16-22 |
Number of pages | 7 |
Journal | Journal of Applied Geophysics |
Volume | 159 |
DOIs | |
Publication status | Published - 1 Dec 2018 |
Keywords
- Ghost reflection
- Horizontal well
- Intrinsic losses
- Numerical modelling
- Quality factor
- Seismic interferometry
- Vertical well