Abstract：Environment (obstacles, weather, tide and etc.) differences often cause differences of source and receiver positions and feathering angles in offshore streamer time lapse seismic. Especially narrow azimuth survey and platform positions shifted in an area will result in non-repeatable features of time lapse seismic. For towed streamer time lapse seismic project in the oilfield M in South China Sea, the baseline is a 4-streamer survey with complicated sail line and big feathering angle. For the monitor survey, 10 streamers with dense and straight sail line (100m separation instead of 200 m for baseline) and smaller feathering angle are adopted. In the data processing stage when source and receiver position difference between baseline and monitor surveys is less than 100m, the trace pairs with the minimum positioning error is reconstructed from redundant monitor seismic data. And relative amplitude preserved processing of the two vintage data as well as the cross-equalization finally produce the 4D seismic result with 99% repeatability, which satisfy the requirement of reservoir study and remaining oil predication.
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