频谱分解方法比较及其在轮古地区碳酸盐岩储层预测中的应用
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摘要
塔里木盆地奥陶系碳酸盐岩具有非均质性强、各向异性特征显著和基质孔渗性低等特点,给储层的预测带来一定困难,为进一步提高储层预测精度,开展了频谱分解的储层预测技术研究。不同分频方法具有不同的优缺点和适用条件,其中基于S-变换的频谱分解技术采用的时窗随频率变化,适用于非平稳地震信号的处理,有较好的时频分辨率和多分辨率,具有局部性、时移性和无损可逆性等特点,低频段的成像效果好,特别适用于碳酸盐岩储层的预测研究。应用S-变换的频谱分解技术,对塔里木盆地轮古地区进行地震频谱成像分析,预测溶蚀孔洞的空间展布,和已有实钻井全部符合,证明该方法的适用性。
Due to the strong heterogeneity,anisotropy,low porosity and permeability of matrix in the Cretaceous carbonate reservoirs of Tarim Oilfield,it was difficult for reservoir prediction in Lungu Area of Tarim Basin.The reservoir prediction methods using frequency-spectral decomposition were used to further improve the accuracy of reservoir prediction.Different decomposition methods had different advantages,faults,and applicable conditions.The method of frequency-spectral decomposition technique of S-transformation was changed with frequency,which was adaptive for non-stationary seismic signal processing.It had high time-frequency solution and multi-frequency solution with the characteristics of localization,time shifting,perfect reversibility,as well as good imaging quality on low frequency.Therefore it was especially appropriate for carbonate reservoir prediction.The technique of S-transformation is used for frequency-spectral imaging analysis and predicting the spatial distribution of dissolution caves in Lungu Area of Tarim Basin.The result is consistent with actual drilling data,it is demonstrated that the method is adaptive.
Due to the strong heterogeneity,anisotropy,low porosity and permeability of matrix in the Cretaceous carbonate reservoirs of Tarim Oilfield,it was difficult for reservoir prediction in Lungu Area of Tarim Basin.The reservoir prediction methods using frequency-spectral decomposition were used to further improve the accuracy of reservoir prediction.Different decomposition methods had different advantages,faults,and applicable conditions.The method of frequency-spectral decomposition technique of S-transformation was changed with frequency,which was adaptive for non-stationary seismic signal processing.It had high time-frequency solution and multi-frequency solution with the characteristics of localization,time shifting,perfect reversibility,as well as good imaging quality on low frequency.Therefore it was especially appropriate for carbonate reservoir prediction.The technique of S-transformation is used for frequency-spectral imaging analysis and predicting the spatial distribution of dissolution caves in Lungu Area of Tarim Basin.The result is consistent with actual drilling data,it is demonstrated that the method is adaptive.
引文
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[3]马朋善,高秀花,汪贵春,等.小波分析在地震资料分频处理中的应用[J].特种油气藏,2007,14(3):35~38.
[4]Sinha S,Routh P S,Anno P D.Spectral decomposition of seismic data with continuous-wavelet transform[J].Geophysics,2005,70(6):19~25.
[5]苑书金.非正交小波变换的频谱分解技术在大牛地气田储层预测中的应用[J].天然气工业,2007,27(12):52~54.
[6]Simonorski I,Boltezar M.The norms and variances of the Gabor,Morlet and general harmonic wavelet functions[J].Journal ofSound and Vibration,2003,264:545~557.
[7]Strockwell R G,Mansinha L,Lowe R P.Localization of the complex spectrum:The S-transform[J].IEEE Transactions on SignalProcessing,1996,44(4):998~1001.