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Source Ghost Generation: Observations From A Dual Near-Field Hydrophone Test
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, Marine Acquisition Workshop 2018, Aug 2018, cp-560-00025
- ISBN: 978-94-6282-259-7
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Abstract
We evaluate experimental data acquired using a dual-string airgun array instrumented with two near-field hydrophone (NFH) channels per source element, and use these data to estimate far-field signatures without need for assumptions on the reflectivity of the sea-surface (Parkes and Hatton, 1986). The acquired NFH data are consistent with the presence of cavitation in the down-going wavefield and reveal details of the wavefield which are not predicted by a conventional ghost model. Directional de-signature operators are derived and applied to seismic data shot using the test configuration. Results are compared with a reference dataset processed using signatures estimated in the typical way i.e. from just one channel per element of NFH data, and using a frequency-dependent sea-surface reflection coefficient. We discuss the potential benefits of using additional NFH and outstanding issues going forward.