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中国南海相继发现大量礁滩相油气藏,它们具有埋藏深、油气分布不均匀、勘探难度大等特点。低频伴影和频率衰减梯度是基于小波变换谱分解的两种时频分析方法,它们与储集层中流体密切相关,不仅可以作为流体识别的重要标志,还可以确定储集层的横向展布,但是不易对其顶、底边界进行识别。作为储集层预测重要方法之一的波阻抗反演,可以利用测井纵向分辨率高的优点,有效地分辨储集层的顶、底界限。因此,将这两种方法相结合,可以更好地预测M地区储集层位置,在纵、横向上精细刻画储集层及其油气富集范围,提高预测精度。
A large number of reef-shoal facies reservoirs have been discovered successively in the South China Sea. They have the characteristics of deep burial, uneven distribution of oil and gas, and great exploration difficulty. Low Frequency Companion and Frequency Attenuation Gradient are two kinds of time-frequency analysis methods based on spectral decomposition of wavelet transform. They are closely related to fluids in reservoirs. They can not only be used as an important marker for fluid identification, but also determine the horizontal distribution of reservoirs , But it is not easy to identify its top and bottom borders. As an important method of reservoir prediction, wave impedance inversion can utilize the advantage of high vertical resolution of logging to effectively distinguish the top and bottom boundaries of reservoir. Therefore, the combination of these two methods can better predict the location of reservoirs in area M, and finely characterize the reservoir and its hydrocarbon enrichment range vertically and horizontally, so as to improve the prediction accuracy.