拓频技术在砂体预测中的应用  

Frequency-extension in oil sand prediction

作　　者：吴勇[1] 聂凯轩 任金礼 秦建勋[1] 李爱军[1] 王建柱[1] 李艳新[1] 

机构地区：[1]大港油田第二采油厂,河北黄骅061103 [2]北京中油吉亚科技发展有限公司,北京100101 [3]陕西省地质矿产勘查开发局物化探队,陕西西安710043

出　　处：《石油地球物理勘探》2011年第A01期80-83,163+170,共4页Oil Geophysical Prospecting

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.

关 键 词：薄层 岩性圈闭 地震属性参数 频率域 拓频技术 

分 类 号：P631[天文地球—地质矿产勘探]