【摘要】 工频干扰噪音是野外采集数据中遇到最多的干扰信号,经常将记录中的有效信号湮没,严重影响了地震数据的质量。虽然工频信号的频率成分和地震数据中有效信号的频率成分非常接近,但工频干扰信号的瞬时频率和相位是不随时间变化的,为一固定的常数,同时其振幅谱也不是时间的函数;而有效信号的瞬时频率、瞬时相位以及瞬时振幅都随时间而变化。基于此差异特征,提出了在时频域内直接从实际地震数据中提取工频干扰信号并将其从数据中剔除的方法。模型数据和野外实际数据测试表明:该方法具有较好的压制效果且对有效信号伤害较少,同时在未知干扰信号的频率分布情况下也能适用。更多还原

【Abstract】 The power-line interference is the mostly encountered noise in seismic field data. It can annihilate effective signals in record and seriously impact seismic data quality. Although the frequency components of power-line interference are very similar to those of effective signal in seismic data, but the instantaneous frequency and instantaneous phase of the former are not time-dependent fixed constants and amplitude spectrum also not temporal function, while those of effective signal are all time-dependent. Based on these differences, a method of power-line interference pick-up directly from actual seismic data within time-frequency domain and then eliminated put forward. The testing of model information and actual field data shown that the method has better suppression effects and less harm to effective signal, and also applicable to the situation of unknown interference frequency distribution.更多还原