Wide-azimuth data deabsorption prestack time migration in OVT domain

XiaoTong ZHANG, XingJun WANG, DuoMing ZHENG, JiangJie ZHANG, LiNong LIU

Prog Geophy ›› 2025, Vol. 40 ›› Issue (2) : 605-618.

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Prog Geophy ›› 2025, Vol. 40 ›› Issue (2) : 605-618. DOI: 10.6038/pg2025II0124

Wide-azimuth data deabsorption prestack time migration in OVT domain

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Abstract

As domestic oil and gas fields enter their late development stages and the exploration of unconventional oil and gas fields progresses, the industry's demand for higher resolution in seismic exploration continues to rise. This necessitates the consideration of the stratum's viscoelastic absorption impact during the migration imaging process. Facing the complexities of medium parameter modeling, stability in the compensation process, and noise suppression issues, the stationary-phase QPSTM (Deabsorption Prestack Time Migration) technique offers a fundamental solution through the use of effective Q parameters obtained by scanning technology and adaptive migration apertures. However, since the absorption and propagation path of seismic waves are closely intertwined, the accuracy of using effective Q to address viscoelastic absorption issues in the context of complex paths still requires improvement. Currently, accurate modeling of Q parameters in layers remains a challenge for the industry. In light of this, we have adopted a new approach by grouping Offset Vector Tile (OVT) gathers and combining them with QPSTM technique, to develop an OVT domain Q prestack time migration method. This method, based on grouping effective Q by offset and azimuth, achieves more precise compensation for viscoelastic medium absorption and finds a better balance between Q parameter compensation threshold and noise suppression. Test results using field data have demonstrated that this method can improve existing deabsorption prestack time migration by avoiding the modeling of Q parameters in layers, and achieve a more balanced resolution and signal-to-noise ratio in the migration results. This provides an effective industrial solution for viscoelastic medium prestack time migration.

Key words

Viscoelastic medium prestack time migration / OVT gathers / Effective Q parameter / High resolution / High signal-to-noise ratio

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XiaoTong ZHANG , XingJun WANG , DuoMing ZHENG , et al . Wide-azimuth data deabsorption prestack time migration in OVT domain[J]. Progress in Geophysics. 2025, 40(2): 605-618 https://doi.org/10.6038/pg2025II0124

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