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Cumulant-based Time Delay Estimations Based Solution for Statics Correction of Land Data
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, 79th EAGE Conference and Exhibition 2017, Jun 2017, Volume 2017, p.1 - 5
Abstract
Land surveys with complex near-surface conditions always have many challenges in statics correction. Most residual statics correction methods, which are based on statistical correlation, require accurately picked first-arrival travel times. When the signal-to-noise ratio (SNR) of first arrivals is low especially at far offset, manual picking may be inevitable, which will generate costly expense in time and labors. Correlation based seismic interferometry is usually used to enhance low-SNR first arrivals to avoid manual picking, but correlation is sensitive to Gaussian noise. In this paper, we develop the cumulant-based coherent integration (CCI) to estimate time delays of refraction first arrivals and further apply the estimated time delays to calculate residual statics. Compared to correlation-based methods, CCI has improved anti-noise performance, because HOC is blind to Gaussian noise. The applications on synthetic data and field seismic data from a survey in western China demonstrate the effectiveness of the proposed method to calculate residual statics and its improvement on the anti-noise performances. Meanwhile, compared to the first arrival based method in commercial software, our method avoids expenses of manual picking.