分频技术在北部湾盆地储层预测中的应用

Application of Seismic Frequency-decomposing Technology in the Prediction of Reservoirs in Beibuwan Basin

对于地震资料分辨率低、储层较深、非均质性强的地区,采用常规的波阻抗反演效果不好。基于时频分析的分频技术,能够细致研究时变地震信号,进而对储层进行预测。首先利用时频分析结合地震相研究沉积旋回变化,然后在研究频率振幅域与岩性的敏感性、频率能量与岩性交会性的基础上,提出使用分频技术进行储层预测。研究结果表明,基于匹配追踪算法的时频分析与地质沉积中的层序旋回符合较好,中频时振幅谱与砂岩相关性好,分频结果显示振幅能量分布与单井时频分析结果、地质沉积相认识符合度较高,说明利用分频技术进行储层预测是合理可靠的。

In the area of low resolution seismic data and deep reservoir with strong heterogeneity,poor effect was induced by the application of conventional wave impendence inversion technology.Based on the time-frequency analysis,the dynamic seismic signal could be studied carefully for predicting the reservoirs.First,the sedimentary cycle was investigated combined with the time-frequency analysis of seismic facies,and on the basis of studying the sensitivity between amplitude domain of frequency and lithology and crosslinking of frequency energy with the lithology,it was proposed that frequency-decomposing technology was used for reservoir prediction.Result shows that the time-frequency analysis based on the matching pursuit algorithm is well consistent with sequence circles and the amplitude spectrum in mid frequency is well correlated with sandstone,the time-frequency analysis result indicates that the distribution of amplitude energy is highly agreed with those of time-frequency analysis and the identification of geologic sedimentary facies,it demonstrates that it is reasonable for reservoir prediction with the time-frequency analysis technology.