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Maximizing the Ultra-low Frequency Output from Air Guns
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, 76th EAGE Conference and Exhibition 2014, Jun 2014, Volume 2014, p.1 - 5
Abstract
The new generation of broadband seismic offered by the seismic industry today has led to increased focus on how to generate reliable seismic signals containing frequencies below 5 Hz. In this paper we demonstrate from simple air gun modeling theory and field measurements that the bubble generated by a large air gun generates a low frequent signal with a dominant frequency around 0.1–1 Hz. By exploiting this, we think it is possible to enhance and utilize seismic frequencies as low as 1 Hz for exploration purposes. The strength of this ultra-low frequency signal depends on source depth, gun volume and potentially also the shape of the water surface. We think that our approach can be used to construct low-frequency models of basins. In addition, such data could be used to find good starting models for full-waveform inversion as well as for imaging below basalt.