【摘要】 羌塘盆地前期常规二维地震勘探中,获得的资料有效波反射能量较弱,波组连续性较差,相干噪声、散射噪声较强,资料信噪比较低。分析认为提高覆盖次数对该区的叠加成像效果有明显改善,在此基础上,提出了3种宽线观测系统采集方案,经理论分析和应用对比,2L2S(炮点分布在接收线之外35m)的宽线观测系统为最佳方案。实践表明:该方案在压制侧向的散射噪声、相干噪声有较好的效果;在单线采集的基础上成倍地增加了叠加剖面覆盖次数,增强了有效信号,提高了资料的整体信噪比。更多还原

【Abstract】 There are weaker reflect wave energy,poor wave group continuity,stronger coherent noise and scattering noise,and lower signal to noise ratio(SNR) of data in the early 2-D seismic exploration of Qiangtang Basin.After analyses,it is considered that raising coverage number of times can obviously improve the stacked imaging effect of the area.Therefore,three acquisition plans for wide-line observation system were proposed out.By theory analyses and application contrast,the 2L2S(shot points were distributed at 35 meters beyond the receiving line) plan is proved to be the optimum.The scheme can effectively suppress the lateral scattering noise and coherent noise,increase the coverage number of times of stacked profile in multiples,strengthen the effective signal,and improve the whole SNR of data.更多还原