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超深海油气藏是近期全球勘探热点和新发现重点领域,同期巴西盐下碳酸岩油气藏勘探取得重要突破.为提高超深海盐下碳酸岩油气藏地震资料品质,本文引入全波形反演(FWI)技术,该技术利用叠前地震波场的运动学和动力学信息重建复杂地质背景下构造的细节和岩性信息,提升速度建模精度.同时为建立高精度速度模型和提高计算效率,引入三维广义SRME和高精度层析成像技术,利用VTI和TTI全波形反演技术逐步建立高精度速度模型.对比分析,基于FWI速度模型的偏移结果信噪比高,波阻连续性好,地层反射特征清晰,与实钻结果吻合度高,勘探成功率高,助推十亿吨级石油地质储量的落实,降低勘探风险,推动超深海盐下碳酸岩油气藏的勘探开发.
The ultra-deep-sea oil and gas reservoirs are the hotspots of recent global exploration and new discoveries, and an important breakthrough has been made in the exploration of carbonate subsalt carbonate reservoirs in Brazil during the same period.In order to improve the seismic data quality of carbonatite reservoirs under ultra-deep sea salt, the full waveform inversion (FWI ) Technique is used to reconstruct the tectonic details and lithology information of complex geological background by using the kinematics and dynamics information of prestack seismic wavefield to improve the accuracy of velocity modeling.At the same time, to establish a high-precision velocity model and improve the computational efficiency, Generalized SRME and high-resolution tomography, the high-precision velocity model is gradually established by using VTI and TTI full waveform inversion technique.Comparison and analysis, the offset results based on the FWI velocity model have high signal-to-noise ratio, good continuity of wave resistance, The characteristics are clear, coincide with the real drilling results, and the successful exploration rate is high, boosting the implementation of 1 billion tonne oil geological reserves, reducing the exploration risk, and promoting the exploration and development of carbonate rocks and reservoirs under ultra-deep sea salt.