白云凹陷深水复杂构造区斜缆地震资料处理关键技术及应用

斜缆地震采集采用水下电缆变深度施工方式,从而产生连续变化的鬼波陷波频率,有利于最大程度地压制鬼波,获得高信噪比和高保真的宽频地震数据。针对珠江口盆地白云凹陷深水复杂构造区斜缆三维地震资料,采用了不同于常规拖缆地震资料处理的子波处理、三维水面相关多次波去除(3D SRME)、镜像偏移和联合反褶积去鬼波、Q补偿等斜缆地震资料处理关键技术,有效地去除了多次波,压制了鬼波,拓宽了低频和高频信息,提高了地震资料信噪比和分辨率。斜缆地震资料处理显著改善了中深层复杂构造成像效果,更好地满足了白云凹陷深水复杂构造区地震反演和解释的需求。

The variable-depth streamer seismic survey can generate ghost frequencies of continuous variation that are easy to suppress farthest,thus obtained high S/N and high fidelity seismic data with wideband.For the 3D seismic data of variable-depth streamer survey in deepwater complex structure area of Baiyun Sag in Pear River Mouth Basin,the processing techniques are different from the regular level-streamer seismic data processing.The key techniques include seismic wavelet processing,3D SRME,mirror migration and joint deconvolution,Q-compensation in phase and amplitude.These techniques eliminated the multiples,suppressed the ghosts,extended both low and high frequency bands,and increased the S/N and resolution.The processed final data improved the quality of complex structure image for middle and deep layers,and which is much better for seismic inversion and interpretation in deepwater complex area of Baiyun Sag.