DISCUSSION ON DEGHOST FOR MULTI-CHANNEL SEISMIC SURVEY IN THE EAST OF CHINA SEA
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摘要:
在海洋地震勘探中产生的虚反射和一次反射波的波形是一样的，很大程度上会抑制低频分量，造成频域的陷波点，降低地震记录的分辨率，使地震记录的同相轴发生混叠甚至产生假的同相轴。在已知检波器深度和海水速度的情况下，在F—K域中，先分选至炮域压制检波点虚反射，再分选至检波点域压制炮点虚反射，在叠加剖面上，虚反射得到了明显压制。在虚反射压制后的频谱上，陷波得到了恢复，频带得到了明显拓宽，为后续地震反演提供了高品质的地震资料。
Abstract:In offshore seismic survey, the waveform of a ghost looks same as the reflected wave. The ghost may heavily suppress the low-frequency components and result in the notching in frequency domain, and thus reducing the resolution of seismic records and resulting in the event aliasing or false events. In order to improve the quality of seismic data, we put forward in this paper a method as the following. As the depth of seismic receiver and water velocity are known, in the F-K domain, we eliminate the resource ghost in the receiver domain first, and then eliminate the receiver ghost in the shot-point domain. Afterwards, in the spectrum, the notching is restored and the frequency band is widened, which provides high quality seismic data for the subsequent seismic inversion.
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Key words:
- F-K domain /
- notching /
- deghost /
- East of China Sea
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