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Improved Reconstruction and Coherence Analysis of a Wave-Field Extracted from Ambient Seismic Noise Cross-Correlations.
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, 83rd EAGE Annual Conference & Exhibition, Jun 2022, Volume 2022, p.1 - 5
Abstract
We present the workflow and results of a passive seismic study that integrates: 1) the reconstruction of a coherent seismic wavefield based on ambient noise recordings and 2) the analysis of the reconstructed waveforms through a specific attribute called waveform coherence. The aim of this study is to assess the capacity of the method to monitor fluid saturation variations occurring within a natural gas geological storage site.
Specific attention was given to the raw noise data analysis and selection to improve the signal-to-noise ratio of the reconstructed body and surface waves. Then, the analysis of waveform coherence variations in time is performed using a 2D visualization tool that allows for a temporal and spatial observation of changes occurring within the subsurface.