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Imaging Offshore Near-Surface Small-Scale Scatterers using Cross-Correlations and Different Frequency Ranges
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, NSG 2025: 1st Conference on UXO & Object Detection, Sep 2025, Volume 2025, p.1 - 5
Abstract
Summary
We show three different ways of imaging small-scale scatterers for an acquisition with a fixed offset on a round grid. We make use of synthetic data by simulating the response of three scatterers, located at a depth of around 20 m. In one case, all scatterers are located at this depth of 20 m and in the other case, they are all located at different depths around this range. The imaging methods tested include diffractor imaging by summing along a diffraction path, imaging with cross-correlations between traces and imaging with windowed cross-correlations between traces. We do this for two linear chirps that have different frequency ranges, one from 2 to 7 kHz and one from 10 to 16 kHz. When the scatterers are not located at the depth of investigation, the cross-correlation methods show a better lateral constraint than the diffractor imaging for both frequency ranges. When the scatterers are located at the investigation depth, the 2–7 kHz range shows the best result for diffractor imaging, however, the 10–16 kHz range shows the best result when windowed cross-correlations are used.
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