天然气水合物准三维地震调查电缆排列长度研究

Study on Array Length of Gas-Hydrate Semi-three Dimension Seismic Survey

地震勘探方法是研究海洋天然气水合物的主要方法之一。在我国某海域对天然气水合物研究过程中,使用了单源单缆准三维地震勘探方法,获得了天然气水合物矿体较好的三维成像效果。影响天然气水合物矿体三维成像的因素很多,其中,电缆排列长度是最直接的影响因素之一。在大量试验数据的基础上,研究了电缆排列长度对野外采集资料的影响,研究结果与海试资料及国内外资料非常吻合,最后通过理论分析与试验资料对比,基本确定了在南海某海域天然气水合物准三维地震调查时最佳的排列长度及电缆段划分等参数,对天然气水合物准三维调查具有一定的指导意义。

Seismic survey is one of the main methods to investigate marine gas-hydrate. During the gas-hydrate investigation on some China sea, the method ＂single source single streamer semi-three dimension seismic survey＂ is used to get a good 3D imaging of gas- hydrate mineral. There are many factors affecting the 3D imaging, among which the array length is one of the most important factors. Based on plenty of test datum, the effect of array length on field investigation is researched. The result is according to the sea test data and literatures. Finally, by comparing theoretical analysis and experimental data, the best parameter of array length and cable division is determined on gas-hydrate semi-3D seismic survey in the South China Sea, which would be a guidance for gas-hydrate semi-3D seismic survey.