AVO截距与梯度交会图分析及应用
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摘要
AVO截距与梯度(P-G)交会图分析是AVO碳氢检测技术的一种重要分析手段.以AVO技术为基础,应用完全形式的Zoeppritz方程合成AVO理论模型,并根据Shuey简化公式拟合P,G值,通过改变砂岩层的纵波速度及泊松比参数,研究它们对P-G交会直线的影响.结果表明:P-G交会直线的斜率随着地层泊松比差异的增大而增加;P-G交会直线的长度随着纵波速度差异的增加而增长.对实际地震资料进行P-G交会图分析进一步证实,根据P-G交会直线的特征可预测泊松比异常地层,即含油气层.
AVO intercept and gradient crossplot analysis is an important analysis tool of hydrocarbon detection.In this paper,based on AVO technique,AVO theoretical models are computed by using Zoeppritz equation,P and G values are fitted according to Shuey's simplified equation.The effect of longitudinal wave velocities and Poisson's ratios on P-G Cross lines is dealt with by changing velocities and Poisson's ratios of layers.By analysis,we find that the slope of the P-G cross line increases along with the Poisson's ratio difference and that the length of the P-G cross line increases along with longitudinal wave velocity difference.By analyzing P-G crossplot of real seismic data,we approve that Poisson's ratio anomaly layers i.e.oil and gas bearing layers can be predicted according to the characteristics of the P-G cross line.
AVO intercept and gradient crossplot analysis is an important analysis tool of hydrocarbon detection.In this paper,based on AVO technique,AVO theoretical models are computed by using Zoeppritz equation,P and G values are fitted according to Shuey's simplified equation.The effect of longitudinal wave velocities and Poisson's ratios on P-G Cross lines is dealt with by changing velocities and Poisson's ratios of layers.By analysis,we find that the slope of the P-G cross line increases along with the Poisson's ratio difference and that the length of the P-G cross line increases along with longitudinal wave velocity difference.By analyzing P-G crossplot of real seismic data,we approve that Poisson's ratio anomaly layers i.e.oil and gas bearing layers can be predicted according to the characteristics of the P-G cross line.
引文
[1]王云专,李素华,朱伦,等.基于AVO正演模拟的泊松比反演[J].大庆石油学院学报,2006,30(1):7-9.
[2]CASTAGNA J P,SWAN H W.Principles of AVO crossplotting[J].The Leading Edge,1997,16(4):337-342.
[3]王云专,余杰,赵洪波,等.利用AVO效应反演泊松比和储层厚度[J].大庆石油学院学报,2001,25(4):1-3.
[4]王卫红,姜在兴,潘仁芳.AVO交会分析及其应用[J].西安石油学院学报:自然科学版,2003,18(2):5-8.
[5]张文,李维新,孙翠娟.AVO交会分析技术的应用[J].中国海上油气,2002,16(4):286-290.
[6]殷八斤,曾灏,杨在岩.AVO技术的理论与实践[M].北京:石油工业出版社,1995:68-86.
[7]SHUEY R T.A simplification of the zoeppritz equations[J].Geophysics,1985,50(4):609-634.
[8]CANNING A,MALKIN A.Classification of AVO data using“Angle plot”crossplots[A].SEG int'l exposition and 72nd annual meet-ing[C].Salt Lake City:SEG,2002.
[2]CASTAGNA J P,SWAN H W.Principles of AVO crossplotting[J].The Leading Edge,1997,16(4):337-342.
[3]王云专,余杰,赵洪波,等.利用AVO效应反演泊松比和储层厚度[J].大庆石油学院学报,2001,25(4):1-3.
[4]王卫红,姜在兴,潘仁芳.AVO交会分析及其应用[J].西安石油学院学报:自然科学版,2003,18(2):5-8.
[5]张文,李维新,孙翠娟.AVO交会分析技术的应用[J].中国海上油气,2002,16(4):286-290.
[6]殷八斤,曾灏,杨在岩.AVO技术的理论与实践[M].北京:石油工业出版社,1995:68-86.
[7]SHUEY R T.A simplification of the zoeppritz equations[J].Geophysics,1985,50(4):609-634.
[8]CANNING A,MALKIN A.Classification of AVO data using“Angle plot”crossplots[A].SEG int'l exposition and 72nd annual meet-ing[C].Salt Lake City:SEG,2002.
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