【摘要】 低频伴影检测技术近年来在砂砾岩和礁滩相储集体油气预测中取得了很好的效果,但很少在浊积体系中应用。良好的时频分析方法是检测低频伴影的关键。为了研究低频伴影在浊积体中油气检测的可行性,运用广义S变换进行瞬时谱分解,产生一系列的共频率数据体,通过检测不同频率振幅能量的差异,发现浊积扇体储集层下方振幅能量随频率增大而逐渐减弱至消失,即低频伴影。研究实例表明,低频伴影能够直接指示油气,在浊积扇体中仍然可以作为储集层预测和油气检测的有效方法。更多还原

【Abstract】 In recent years,low-frequency shadows technique hase been applied effectively to detection of glutenite and reef-flat reservoirs,but seldom to turbidite fan system.The key for detection of low-frequency shadows is to make a good time-frequency analysis.In order to study the feasibility of low-frequency shadows for oil and gas detection in turbidite fan system,the generalized S transform(GST) is applied to transient spectral decomposition,creating a series of common frequency data volumes.Through detection of the amplitude energy variances of different frequencies,it is shown that the amplitude energy beneath turbidite fan reservoir is gradually weakened and disappeared with the frequency increasing,which is regarded as low-frequency shadows.The case study indicates that the seismic low-frequency shadows can directly indicate existence of oil and gas,thus in turbidite fan system,they are also taken as an effective method for reservoir prediction and oil-gas detection.更多还原