关于“气煤弹性各向异性系数实验测试”一文的讨论
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摘要
研究、确定气煤弹性各向异性的类型和大小,对煤田地震各向异性理论的研究具有重要意义."气煤弹性各向异性系数实验测试"一文通过对15块气煤岩样的超声测量,对气煤的弹性各向异性特征进行了分析,获得了对气煤地震勘探有指导意义的结论.但该文的一些理论概念和公式的使用及结论的获得有值得商榷的地方.本文针对此提出了一些修正意见,并利用该文的测试数据进行了补充分析,获得了气煤弹性各向异性相对完整的认识.
Studying and determining the type and magnitude of anisotropy of gas coal is of important significance for studying the seismic anisotropy theory of a coal field.In the paper,"Test on elastic anisotropy coefficients of gas coal",the fifteen gas coal samples were measured by ultrasonic wave.On the basis of this,they measured the P-wave velocity and the horizontal and vertical components of S-wave velocity in three directions parallel to,perpendicular to,and an angle of 45° to the coal seam,and calculated the elastic constants.They analyzed the characteristic of the elastic anisotropy of gas coal and obtained instructive conclusions for seismic exploration on gas coal.However,it is worth discussing on some theoretical concepts and formulae used in the paper.The conclusions obtained in the paper also need to be discussed.In this paper,on account of this,we put forward some amendments.The results show that the anisotropy of gas coal is caused by fine layering of isotropic materials according to the view of Thomsen.Making a supplement analysis of the test datum in the paper,we obtain a relatively complete understanding of the elastic anisotropy of gas coal.
Studying and determining the type and magnitude of anisotropy of gas coal is of important significance for studying the seismic anisotropy theory of a coal field.In the paper,"Test on elastic anisotropy coefficients of gas coal",the fifteen gas coal samples were measured by ultrasonic wave.On the basis of this,they measured the P-wave velocity and the horizontal and vertical components of S-wave velocity in three directions parallel to,perpendicular to,and an angle of 45° to the coal seam,and calculated the elastic constants.They analyzed the characteristic of the elastic anisotropy of gas coal and obtained instructive conclusions for seismic exploration on gas coal.However,it is worth discussing on some theoretical concepts and formulae used in the paper.The conclusions obtained in the paper also need to be discussed.In this paper,on account of this,we put forward some amendments.The results show that the anisotropy of gas coal is caused by fine layering of isotropic materials according to the view of Thomsen.Making a supplement analysis of the test datum in the paper,we obtain a relatively complete understanding of the elastic anisotropy of gas coal.
引文
[1]杨金和,陈文敏.我国煤的基本特性及其主要利用途径[J].煤炭科学技术,1982,3:2-9.Yang J S,Chen W M.Main properties and utilization of Chinese coals[J].Coal Science and Technology,1982,3:2-9.
[2]董守华.气煤弹性各向异性系数实验测试[J].地球物理学报,2008,51(3):947-952.Dong S H.Test on elastic anisotropic coefficients of gas coal[J].Chinese J.Geophys.(in Chinese),2008,51(3):947-952.
[3]胡德绥.弹性波动力学[M].北京:地质出版社,1989.Hu D S.The dynamics of the elastic wave[M].Beijing:Geology Press,1989.
[4]Thomsen L.Weak elastic anisotropy[J].Geophysics,1986,51(10):1954-1966.
[5]Tsvankin I.P-wave signatures and notation for transversely isotropic media:an overview[J].Geophysics,1996,61(2):467-483.
[6]李磊.横向各向同性介质Thomsen公式的适用范围[J].石油物探,2008,47(2):116-123.Li L.Applicability of Thomsen approximate formula in transversely isotropic media[J].Geophysical Prospecting for Petroleum,2008,47(2):116-123.
[7]Tsvankin I.Reflection move-out and parameter estimation for horizontal transverse isotropy[J].Geophysics,1997,62(2):614-629.
[8]Ruger A.P-wave reflection coefficients for transversely isotropic models with vertical and horizontal axis symmetry[J].Geophysics,1997,62(3):713-722.
[9]梁锴.TI介质地震波传播特征与正演方法研究[D].中国石油大学,2009.Liang K.The study on propagation feature and forward modeling of seismic wave in TI media[Doctor’s thesis].China University of Petroleum,2009.
[10]刘斌,席道瑛,葛宁洁等.不同围压下岩石中泊松比的各向异性[J].地球物理学报,2002,45(6):880-890.Liu B,Xi D Y,Ge N J,et al.Anisotropy of Poisson’s ratio in rock samples[J].Chinese J.Geophys.(in Chinese),2002,45(6):880-890.
[2]董守华.气煤弹性各向异性系数实验测试[J].地球物理学报,2008,51(3):947-952.Dong S H.Test on elastic anisotropic coefficients of gas coal[J].Chinese J.Geophys.(in Chinese),2008,51(3):947-952.
[3]胡德绥.弹性波动力学[M].北京:地质出版社,1989.Hu D S.The dynamics of the elastic wave[M].Beijing:Geology Press,1989.
[4]Thomsen L.Weak elastic anisotropy[J].Geophysics,1986,51(10):1954-1966.
[5]Tsvankin I.P-wave signatures and notation for transversely isotropic media:an overview[J].Geophysics,1996,61(2):467-483.
[6]李磊.横向各向同性介质Thomsen公式的适用范围[J].石油物探,2008,47(2):116-123.Li L.Applicability of Thomsen approximate formula in transversely isotropic media[J].Geophysical Prospecting for Petroleum,2008,47(2):116-123.
[7]Tsvankin I.Reflection move-out and parameter estimation for horizontal transverse isotropy[J].Geophysics,1997,62(2):614-629.
[8]Ruger A.P-wave reflection coefficients for transversely isotropic models with vertical and horizontal axis symmetry[J].Geophysics,1997,62(3):713-722.
[9]梁锴.TI介质地震波传播特征与正演方法研究[D].中国石油大学,2009.Liang K.The study on propagation feature and forward modeling of seismic wave in TI media[Doctor’s thesis].China University of Petroleum,2009.
[10]刘斌,席道瑛,葛宁洁等.不同围压下岩石中泊松比的各向异性[J].地球物理学报,2002,45(6):880-890.Liu B,Xi D Y,Ge N J,et al.Anisotropy of Poisson’s ratio in rock samples[J].Chinese J.Geophys.(in Chinese),2002,45(6):880-890.
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