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oa Full Azimuth Modelling at Heidrun
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, EAGE Workshop on Marine Seismic - Focus on Middle East and North Africa, Feb 2009, cp-119-00004
- ISBN: 978-94-6282-068-5
Abstract
A simulation study was initiated to investigate whether or not a marine full azimuth acquisition geometry improves the image of the subsurface at Heidrun. Full azimuth shot data was modelled with finite difference and one-way wave equation modelling, and images obtained from full, wide, and narrow azimuth survey geometries were compared with each other. The study shows that a full azimuth geometry leads to better suppression of noise, less migration artefacts, more consistent amplitudes along horizons, and sharper fault planes than a narrow azimuth design. Attenuation of multiple energy is present, but less than expected. The improvements in image quality can be obtained with a realistic 4-vessel wide azimuth design and a coil geometry, but the coil geometry has a smaller acquisition footprint in the shallower part. Based on the modelling results, a field trial with coil design was carried out at Heidrun.