拓频技术在砂体预测中的应用
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摘要
地震拓频技术就是在小时窗内通过频谱分解研究薄层变化,在频率域通过调谐振幅或相位研究储层横向变化规律,利用不同频率对不同尺度地质体存在不同的响应特征认识地质体,可识别厚度小于1/4地震波长的薄层。文中对歧北斜坡南中段缓坡带进行了多种地震参数的提取和分析,包括瞬时频率、瞬时相位、均方根振幅、相位余弦等。分析结果表明,地震拓频属性分析技术对该区的主力油砂体的变化较敏感,尤其对BS6—BS8井区沙河街组主力油层的厚度变化反映突出,与新钻探的B35、B38、B39、B27井的检验结果吻合程度较高,获得了较好的应用效果。
The seismic frequency-extension technology studies thin-layer changes in small time window from spectrum analysis.Reservoir lateral changes in frequency domain are found by tuning amplitude or phase,and different scale geo-bodies are identified by response characteristics of different frequencies.This technology can help us identify thin layer with thickness less than 1/4 wavelength.We extract a few seismic attributes,including instantaneous frequency,instantaneous phase,root-mean-square amplitude,phase cosine and so on.Our study shows that the frequency-extension attributes are very sensitive to main oil sands,especially to thickness changes of oil sands of Shahejie formation between Wells BS6-BS8.And our predictions match well with the results of the new drilled Wells B35,B38,B39,and B27.
The seismic frequency-extension technology studies thin-layer changes in small time window from spectrum analysis.Reservoir lateral changes in frequency domain are found by tuning amplitude or phase,and different scale geo-bodies are identified by response characteristics of different frequencies.This technology can help us identify thin layer with thickness less than 1/4 wavelength.We extract a few seismic attributes,including instantaneous frequency,instantaneous phase,root-mean-square amplitude,phase cosine and so on.Our study shows that the frequency-extension attributes are very sensitive to main oil sands,especially to thickness changes of oil sands of Shahejie formation between Wells BS6-BS8.And our predictions match well with the results of the new drilled Wells B35,B38,B39,and B27.
引文
[1]Brown A R.Seismic attributes and their classification.The Leading Edge,1996,15(10):1090
[2]Marple S L.Frequency resolution of Fourier and maxi-mum entropy spectral estimates.Geophysics,1982,47:1303～1307
[3]Partyka G,Gridley J and Lopez J.Interpretational ap-plication of spectral decomposition in reservoir charac-terization.The Leading Edge,1999,18:353～360
[4]高建虎,雍学善,刘洪.频率域储层预测技术研究.天然气地球科学,2007,18(6):808～812Gao Jian-hu,Yong Xue-shan,Lin Hong.Study ofreservoir prediction technology in frequency domain.Natural Gas Geoscience,2007,18(6):808～812
[5]袁志云,孔令洪,王成林.频谱分解技术在储层预测中的应用.石油地球物理勘探,2006,41(增刊):11～15
[2]Marple S L.Frequency resolution of Fourier and maxi-mum entropy spectral estimates.Geophysics,1982,47:1303～1307
[3]Partyka G,Gridley J and Lopez J.Interpretational ap-plication of spectral decomposition in reservoir charac-terization.The Leading Edge,1999,18:353～360
[4]高建虎,雍学善,刘洪.频率域储层预测技术研究.天然气地球科学,2007,18(6):808～812Gao Jian-hu,Yong Xue-shan,Lin Hong.Study ofreservoir prediction technology in frequency domain.Natural Gas Geoscience,2007,18(6):808～812
[5]袁志云,孔令洪,王成林.频谱分解技术在储层预测中的应用.石油地球物理勘探,2006,41(增刊):11～15
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