【摘要】 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,获得了较好的天然气水合物矿体三维成像效果。影响天然气水合物矿体三维成像的因素很多,其中,电缆动态定位精度是最直接的影响因素之一。在大量试验数据的基础上,研究了罗盘对电缆动态定位精度的影响,研究结果与海试资料及国内外资料非常吻合,这对天然气水合物准三维调查具有一定的指导意义。根据该研究结果,在保证一定定位误差的前提下,最终确定了电缆的排列长度为2400 m(192道),获得了较高的动态定位精度。2007年在该海域实施了钻探,国内首次发现了水合物样品。钻探结果与地震资料的吻合证实了准三维地震方法定位精度已达到较高的程度。更多还原

【Abstract】 During the gas-hydrate investigation on the some China Sea,the method named "single source Single streamer semi-three dimension seismic survey" was used to get a satisfying 3D imaging of gas-hydrate mineral body.There are many factors influence the effect of 3D imaging,and streamer dynamic positioning precision is a most important and direct one.Based on a large amount of test data,the authors discussed the influence of compasses on the streamer dynamic positioning precision.And the results were accorded well with sea test data and domestic and overseas seismic data.This will provide a guiding significance for gas-hydrate semi-three dimension seismic survey.According to the result,and with a certain positioning error,the authors confirmed that a streamer array length of 2 400 meters(192 channels) could achieve higher dynamic positioning precision.From the drilling in this area in 2007,the gas-hydrate sample was first found in China.The accordant result of drilling with the seismic data confirmed that the positioning precision had reached a higher level on semi-three dimension seismic survey.更多还原