Print Email Facebook Twitter Monitoring changes in velocity and Q using non-physical arrivals in seismic interferometry Title Monitoring changes in velocity and Q using non-physical arrivals in seismic interferometry Author Draganov, D.S. Ghose, R. Heller, K. Ruigrok, E.N. Faculty Civil Engineering and Geosciences Department Geoscience & Engineering Date 2012-12-31 Abstract Application of seismic interferometry to records from receivers at the Earth’s surface from sources in wells retrieves the reflection response measured at the receivers as if from virtual sources located also at the surface. When the wavefields experience intrinsic losses during propagation, non-physical arrivals (ghosts) would appear in the retrieved result. These ghosts appear due to waves that reflect inside a subsurface layer. Thus, a ghost contains information about the seismic properties of the specific layer. We show how such ghosts can be used to monitor layer-specific changes in the velocity and intrinsic losses in the subsurface. We show how to identify the ghosts using numerical-modelling results from a vertical well, and how to estimate the layer-specific velocity and quality-factor changes using numerical-modelling results from a horizontal well as well as ultrasonic S-wave laboratory data. Subject downholemethodsinterferometrycontrolled source seismologybodywavesseismic attenuation To reference this document use: http://resolver.tudelft.nl/uuid:720350ab-c150-4573-9621-a82f5f27e35e DOI https://doi.org/10.1093/gji/ggs037 Publisher Royal Astronomical Society Embargo date 2013-07-31 ISSN 0956-540X Source Geophysical Journal International, 192 (2), 2013 Part of collection Institutional Repository Document type journal article Rights (c) 2012 The Authors and The Royal Astronomical Society Files PDF 287391.pdf 2.16 MB Close viewer /islandora/object/uuid:720350ab-c150-4573-9621-a82f5f27e35e/datastream/OBJ/view