Abstract
High-frequency seismic data components can be seriously attenuated during seismic wave propagation in unconsolidated (low-velocity) layers, resulting in reduced seismic resolution and signal-to-noise (S/N) ratio. In this paper, first, based on Wiener filter theory, inverse filter calculations for near-surface absorption attenuation compensation were accomplished by analysis of the direct wave spectral components from different distances near the surface. The direct waves were generated by detonators in uphole shots and were acquired by receivers on the surface. The spatially varying inverse filters were designed to compensate for the frequency attenuation of 3D pre-stack CRG (common receiver-gather) data. After applying the filter to CRG data, the high frequency components were compensated with the low frequencies maintained. The seismic resolution and S/N ratio are enhanced and match better with synthetic seismograms and better meet the needs of geological interpretation.
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This work is supported by China Petroleum Technology Innovation Fund Project (Grant No. 0610740122).
Shi Zhanjie graduated from the College of Geo-Exploration Science and Technology of Jilin University in 2001 with a bachelor’s degree in Applied Geophysics and received his PhD from the College of Geo-Exploration Science and Technology of Jilin University in 2006. Now he works in the Exploration and Development Research Institute of Daqing Oil and is working on a post-doctor position in the Department of Earth Science in Zhejiang University. His research interests include high resolution seismic exploration, especially in well-control seismic processing methods.
Tian Gang ⧫, see biography and photo in the APPLIED GEOPHYSICS September 2008 issue, P.237.
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Shi, Z., Tian, G., Wang, B. et al. Near-surface absorption compensation technology and its application in the Daqing Oilfields. Appl. Geophys. 6, 184–191 (2009). https://doi.org/10.1007/s11770-009-0019-9
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DOI: https://doi.org/10.1007/s11770-009-0019-9