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考察了南海深水区水体非均匀性对地震成像的影响.将波动方程方法推广到非均匀运动水体,计算了地震波场瞬时快照,结果表明水体非均匀性影响了地震波的传播时间,在零偏移距处该影响最大可达20 ms.特别地,中尺度涡会使目标地层成像发生畸变,而水体内温度变化是造成这种畸变的根本原因.最后,给出了评估非均匀水体对地震成像影响的方法.
The influence of water body heterogeneity on seismic imaging in the South China Sea deepwater area was investigated. The wave equation method was extended to non-uniform motion water body and instantaneous snapshot of seismic wavefield was calculated. The results show that the non-uniformity of water body affects the propagation time of seismic wave, And the influence can reach up to 20 ms away from the surface.Mostly, the mesoscale eddies cause the imaging of the target formation to be distorted, and the temperature change in the water body is the fundamental reason for this distortion.Finally, Impact of the method.