DE-BUBBLE TECHNOLOGY BASED ON PGS-NUCLEUS SIMULATING FAR-FIELD WAVELETS
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摘要:
海上地震勘探主要采用的是气枪阵列震源。震源激发时，会形成气泡效应，这种现象会严重影响地震资料浅层成像效果，尤其是天然气水合物地震资料的分辨率和信噪比。利用PGS-Nucleus软件模拟实际震源远场子波，进而用该远场子波进行子波整形处理，气泡得到了较好的压制。远场子波采集成本巨大，因此，在缺少远场子波的情况下，该方法是一种较好的替代方法，能够在保护有效反射的情况下有效压制气泡效应，提高地震资料的分辨率和信噪比。
Abstract:The seismic source of air-gun array is often used in offshore seismic exploration. Bubble effect will form when the source is excited. Bubbles will seriously affect the quality of seismic data, especially the signal-to-noise ratio of the seismic survey for NGH (natural gas hydrate). In this paper, the authors attempt to use the software of PGS-nucleus to simulate far-field wavelets, and then utilize them to carry out wavelet shaping processing, so as to effectively suppress the bubble oscillation effect. The acquisition cost of far-field wavelets is huge, so in the absence of far-field wavelets, this method is a good choice, which can effectively suppress the bubble oscillation effect protect the effective reflection and improve the signal-to-noise ratio of seismic data.
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Key words:
- far-field wavelet /
- wavelet shaping /
- bubble oscillation effect /
- de-bubble
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图 5 (a) 远场子波；(b)远场子波—反极性；(c)远场子波—时移至负起跳；(d)远场子波—插入电缆鬼波；(e)远场子波—预测反褶积压制气泡；(f)远场子波—反子波算子
Figure 5.
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