三维地震与海底地震勘探技术愈来愈广泛应用于海洋天然气水合物调查中.为了获取高品质的纵波、转换横波等地震信息,揭示天然气水合物地层的速度结构异常,地震震源是决定调查成功与否的关键技术之一.本文对激发频宽、输出、气泡效应等震源特性及组合技术进行了综合研究,设计了一种新型的GI枪点震源系统,并于2006-2009年期间在南海北部某海域进行一系列试验.试验效果的综合对比表明:震源优化技术的应用明显提高了地震纵波的地层穿透深度,并改善了海底地震仪(OBS)纵波及转换横波的接收效果.%Application of 3-D seismic and OBS exploration has been ever-increasing in the marine survey on natural gas hydrate. The seismic source is one of determining factors in the acquisition, which is related to the quality of seismic data(P-wave and converted S-wave) acquired. The high quality data help to reveal the feature of velocity anomaly of strata bearing gas hydrate. By taking firing bandwidth, output and bubble effect into integrated consideration, a new type of GI gun point source was designed and then applied in the investigation on gas hydrate. Tests were conducted in northern of the South China Sea repeatedly over time from 2006 to 2009. The results indicated the application of new point source can enhance the penetrating capability of seismic P-wave and can improve the quality of P-wave and converted S-wave that OBS acquired.
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