薄储层中转换波反射系数影响因素探讨
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摘要
针对薄储层地震反射模型,讨论了薄层介质中弹性波的简化公式适用范围,并分析了薄层厚度、地层吸收的品质因子对转换波反射系数的影响。研究结果表明,该简化公式适用于薄层厚度小于1/4波长的情况,当薄层厚度小于1/4波长时,转换波的反射系数随薄层厚度增加而增加,在1/4波长处达到最大值。品质因子越小,转换波反射系数曲线越平滑。当中间层厚度比较大的时候,品质因子越大,转换波反射系数曲线波动越大。
As for seismic reflection model of thin reservoir,we discuss the application of elastic wave's simplified formula,and analyze the impact of layer thickness and formation absorption quality on convert wave reflection coefficient.The results show that this simplified formula is suitable for less than 1/4 wavelength thin-bed thickness,while the thickness of thin layer is less than 1/4 wavelength,the converted-wave reflection coefficient increases with the thin thickness and reaches its maximum at 1/4 wavelength.The smaller the quality factor is,the smoother converted wave reflection coefficient curve is.When the thickness of middle-layer is relatively large,the greater the quality factor is,the greater the volatility of converted-wave reflection coefficient is.
As for seismic reflection model of thin reservoir,we discuss the application of elastic wave's simplified formula,and analyze the impact of layer thickness and formation absorption quality on convert wave reflection coefficient.The results show that this simplified formula is suitable for less than 1/4 wavelength thin-bed thickness,while the thickness of thin layer is less than 1/4 wavelength,the converted-wave reflection coefficient increases with the thin thickness and reaches its maximum at 1/4 wavelength.The smaller the quality factor is,the smoother converted wave reflection coefficient curve is.When the thickness of middle-layer is relatively large,the greater the quality factor is,the greater the volatility of converted-wave reflection coefficient is.
引文
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[3]孙鹏远,孙建国,卢秀丽.P-SV波AVO分析[J].石油地球物理勘探.2003,38(2):131-135.
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[5]Rutherford S R,Williams R H.Amplitude-versus-offset variations in gas sands[J].Geophysics,1989,54(6):680-688.
[6]Castagna J P,Swan H W.Principles of AVO crossplotting[J].The Leading Edge,1997,16(4):337-344.
[7]Barnola A S,White R E.Ardner’s relations and AVO inversion[J].First Break,2001,19(11):607-611.
[8]Fryaer G J.Reflectiviy of the ocean bottom at lower frequency[J].J Acous Soc Am,1978,63(1):35-42.
[2]孙鹏远,孙建国,卢秀丽.P-P波AVO近似对比研究定性分析[J].石油地球物理勘探.2002,37(增刊):164-171.
[3]孙鹏远,孙建国,卢秀丽.P-SV波AVO分析[J].石油地球物理勘探.2003,38(2):131-135.
[4]汪恩华.适用于AVO分析的层状介质反射系数公式及模型计算[J].石油地球物理勘探,1991,26(4):424-436.
[5]Rutherford S R,Williams R H.Amplitude-versus-offset variations in gas sands[J].Geophysics,1989,54(6):680-688.
[6]Castagna J P,Swan H W.Principles of AVO crossplotting[J].The Leading Edge,1997,16(4):337-344.
[7]Barnola A S,White R E.Ardner’s relations and AVO inversion[J].First Break,2001,19(11):607-611.
[8]Fryaer G J.Reflectiviy of the ocean bottom at lower frequency[J].J Acous Soc Am,1978,63(1):35-42.
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