基于確定性子波處理的鬼波壓制方法
[Abstract]:Ghost wave interference is always a difficult problem in marine seismic exploration, which has not been solved fundamentally for a long time, which seriously restricts the progress of seismic exploration technology. At present, most of the suppression methods are mainly aimed at cable ghost wave, which can not suppress the source ghost wave well. In this paper, a method of ghost wave suppression based on deterministic wavelet processing is proposed. The far-field wavelet is obtained first, then three types of seismic wavelet are obtained from the far-field wavelet, and the matching operator between the wavelet is obtained. Then the operator is applied to the actual seismic data and the result of suppressing ghost waves is obtained. This method requires the air gun source wavelet to be relatively stable in the process of seismic acquisition, and the wavelet obtained by various methods is basically close to the actual wavelet. The theoretical model test results show that the proposed method can suppress both cable and source ghost waves and obtain more accurate results even if affected by the attenuation of formation absorption. The results of practical data application show that the seismic profile wave group characteristics are clear and the reflection cophase axis is single, which is beneficial to structural interpretation. The frequency spectrum bandwidth of seismic data is rich in high and low frequency energy, and there is no obvious trapping frequency point, which is beneficial to reservoir inversion.
【作者單位】: 中海油研究總院;
【基金】:“十二五”國家科技重大專項(xiàng)“南海深水區(qū)油氣勘探地球物理關(guān)鍵技術(shù)(編號(hào):2011ZH05025-001)”部分研究成果
【分類號(hào)】:P631.4
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