Print Email Facebook Twitter Multiscattering illumination in blended acquisition Title Multiscattering illumination in blended acquisition Author Berkhout, A.J. Blacquiere, G. Verschuur, D.J. Faculty Civil Engineering and Geosciences Department Geoscience & Engineering Date 2012-02-16 Abstract In traditional seismic surveys, the firing time between shots is such that the shot records do not interfere in time. However, in the concept of blended acquisition, the records do overlap, allowing denser source sampling and wider azimuths in an economic way. A denser shot sampling and wider azimuths make that each subsurface gridpoint is illuminated from a larger number of angles and will therefore improve the image quality in terms of signal-to-noise ratio and spatial resolution. We show that — even with very simple blending parameters like time delays — the incident wavefield at a specific subsurface gridpoint represents a dispersed time series with a “complex code”. For shot-record migration purposes, this time series must have a stable inverse. In a next step, we show that the illumination can be further improved by utilizing the surface-related multiples. This means that these multiples can be exploited to improve the incident wavefield by filling angle gaps in the illumination and/or by extending the range of angles. In this way, the energy contained in the multiples now contributes to the image, rather than decreasing its quality. One remarkable consequence of this property is that the benefits to be obtained from the improved illumination depend on the detector locations in acquisition geometries as well.We show how to quantify the contribution of the blended surface multiples to the illuminating wavefield for a blended source configuration. Results confirm that the combination of blending and multiple scattering increases the illumination energy and, therefore, will improve the quality of shot-record migration results beyond today’s capability. To reference this document use: http://resolver.tudelft.nl/uuid:fcb81997-ef0a-4751-8563-b1afe04c5a81 DOI https://doi.org/10.1190/GEO2011-0121.1 Publisher Society of Exploration Geophysicists ISSN 0016-8033 Source Geophysics, 77 (2), 2012 Part of collection Institutional Repository Document type journal article Rights (c) 2012 Society of Exploration Geophysicists Files PDF 283040.pdf 908.12 KB Close viewer /islandora/object/uuid:fcb81997-ef0a-4751-8563-b1afe04c5a81/datastream/OBJ/view