【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。更多还原

【Abstract】 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.更多还原