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Feasibility Assessment of 4D Ocean Bottom Seismic Monitoring for CCS Applications in South Korea
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, NSG 2025: 31st Meeting of Environmental and Engineering Geophysics, Sep 2025, Volume 2025, p.1 - 5
Abstract
Summary
This study presents a feasibility assessment of 4D seismic monitoring offshore Pohang, South Korea, using Ocean Bottom Cables (OBC). A small-scale survey was conducted with a single OBC and sparse shot line spacing, resulting in relatively high initial NRMS values compared to international benchmarks. Environmental factors such as tide variations, ambient noise, and near-surface heterogeneities also contributed to baseline noise. To address these challenges, advanced 4D data processing workflows were applied, including receiver position refinement using the DER method, trace rotation, PZ summation, and noise suppression. As a result, NRMS values were significantly reduced by up to 10% through trace match filtering, and further improvements were achieved with additional residual noise suppression. The study validates the feasibility of reliable 4D seismic monitoring offshore Korea and establishes a realistic baseline for future CCS projects. It highlights the necessity for optimized acquisition strategies and advanced processing techniques to enhance repeatability. The results support the future application of 4D monitoring at domestic geological storage candidate sites for CCS.
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