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- W2022605819 abstract "Variable-depth streamer acquisition has become a popular solution for marine seismic acquisition to obtain broad bandwidth data: the curved cable profile produces notch diversity that minimizes residual ghost and the deep towing segment provides high S/N at low frequencies. However, there have been discussions in the industry regarding the fidelity of AVO response from variable-depth streamer data due to the obvious changes in frequency and wavelet with offset. To answer this question, we need to focus on these key questions: can we remove the ghost successfully? Can we compensate the earth absorption effect to balance the spectrum from near to far offset? Based on the de-ghosting algorithm that is termed Ghost Wavefield Elimination (GWE) which inversion in the tau-p domain (Wang et al. 2013, Poole 2013), we analyse the influence of GWE on the AVO response by using 2D synthetic datasets which were modelled by visco-elastic wave equation (Kjstansson, 1979) with two streamer towing configurations - conventional flat tow (8m) and depth-variable way (7~50m). GWE was applied on both datasets and the results show that it is very effective in attenuating the ghost energy. Furthermore, the AVO responses obtained in GWE results are almost identical. However, both AVO curves still decay rapidly in far offsets. To compensate this, pre-stack depth migration that incorporates the synthetic Q model (Q-PSDM) was applied. The resulting AVO curves then match well with the Aki Richards synthetic. Our approach was then applied on a recent BroadSeis survey offshore Vietnam with source/receiver de-ghosting, shallow water de-multiple, advanced depth imaging and proper Q compensation. The high resolution common image gathers (CIGs) were then compared with the well synthetic gathers: AVO trends were picked along the top of sand layers and a good match was found within a frequency band of 5-60 Hz. To summarise, we have demonstrated through both synthetic and real data examples that AVO fidelity is preserved for depth-variable streamer data with GWE pre-migration de-ghosting technology and ray path honouring pre-stack absorption compensation through Q-PSDM." @default.
- W2022605819 created "2016-06-24" @default.
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- W2022605819 date "2015-05-11" @default.
- W2022605819 modified "2023-09-24" @default.
- W2022605819 title "Is depth-variable streamer data AVO friendly? A study using both synthetic and real data" @default.
- W2022605819 doi "https://doi.org/10.3997/2214-4609.201412441" @default.
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