信噪比研究及其在江苏油田的应用
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摘要
针对江苏油田实际资料,应用叠加法、时间域SVD法、频率域SVD法、频率域估算法进行信噪比分析研究。结果表明时间域SVD法估算实际信噪比较为可靠。模型研究表明,基于现有理论添加的噪声获得信噪比与实际信噪比存在很大的差异,针对这一问题提出利用时间域SVD法反算需要添加的噪声,所获得的信噪比对实际应用才有指导意义。模型研究显示:对于储层研究,信噪比不小于2的地震资料是相对可靠的。S油田地震资料正演模拟和实际研究在平均频率属性方面具有很好的一致性,表明江苏油田还存在许多质量可靠的资料有待我们发现研究。
Based on the practical data of Jiangsu Oilfield,signal to noise ration (SNR) study was carried out with stack method,time-domain SVD method,frequency-domain SVD method and frequency-domain estimation method.As a result,the time-domain SVD method was proved to be the most reliable one.The model study showed that the additive noise based on present theory brought a great different SNR from the reality.In order to settle this problem,it is proposed to reverse the additive noise by time domain SVD method,which can render correct guidance to the practice.Model study showed that when SNR is no less than 2,the seismic data is more reliable.Forward modeling of S oilfield was consistent with the reality well in average frequency,which indicated that more and more reliable seismic data of Jiangsu Oilfield will be found and studied.
Based on the practical data of Jiangsu Oilfield,signal to noise ration (SNR) study was carried out with stack method,time-domain SVD method,frequency-domain SVD method and frequency-domain estimation method.As a result,the time-domain SVD method was proved to be the most reliable one.The model study showed that the additive noise based on present theory brought a great different SNR from the reality.In order to settle this problem,it is proposed to reverse the additive noise by time domain SVD method,which can render correct guidance to the practice.Model study showed that when SNR is no less than 2,the seismic data is more reliable.Forward modeling of S oilfield was consistent with the reality well in average frequency,which indicated that more and more reliable seismic data of Jiangsu Oilfield will be found and studied.
引文
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[2]荆大威.海上气藏的叠前振幅检测[J].石油地球物理勘探.1989,24(4):410-421
[3]黄绪德.油气预测与油气藏描述:地震勘探直接找油气[M].南京:江苏科学技术出版社,2003
[4]欧庆贤.让“直接”找油气梦想成真——对《油气预测与油气藏描述地震勘探直接找油气》一书的评述[J].勘探地球物理进展.2004,27(4):81
[5]刘洋,李承楚.地震资料信噪比估计的几种方法[J].石油地球物理勘探.1997,32(2):257-262
[6]牛聪,詹毅,李辉峰.对比地震记录信噪比的几种估算方法[J].物探化探计算技术.2006,28(1):5-9
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