Acquisition and processing of a high resolution 3D seismic survey - Offshore Netherlands
conference paper
This paper describes the data acquisition and processing of a 3D high resolution seismic (HRS) survey acquired off-shore Rotterdam, the Netherlands. Target of the survey was the upper 1000 meters in the vicinity of a candidate CO2 storage site. The acquisition concept was based on deployment of six 24-channel streamers in combination with two seismic sources operating in 'flip-flop' mode. Exact positioning of the spread was achieved using multiple GPS nodes and ship gyro. Major differences from conventional seismic processing practice include retaining frequencies up to 300 Hz, having short intervals between sources and receivers, and relatively large static shifts. Processing included removing the source signature with an inverse filter. Correcting for data gaps by using supergather distance weighted smoothing. Pre-stack time migration, followed by full and offset-limited stacks. The new deployment concept resulted in high-quality 3D images with the resolution and dense coverage that is required to identify and delineate shallow anomalies and structures related to gas presence and migration paths. Based on this first demonstration,we expect that 3D HRS can be developed into a viable technology for a broad range of applications related to off-shore site investigation, risk assessment, and exploration for shallow targets.
Topics
TNO Identifier
954676
ISBN
9781510806
Publisher
European Association of Geoscientists and Engineers, EAGE
Source title
77th EAGE Conference and Exhibition 2015: Earth Science for Energy and Environment, 77th EAGE Conference and Exhibition 2015: Earth Science for Energy and Environment, 1 June 2015 through 4 June 2015
Pages
3307-3311
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