斜井泥岩声波速度各向异性校正新方法研究
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摘要
斜井中测量到的声波记录了泥岩中纵波速度的各向异性,进行泥岩速度各向异性校正需要确定泥岩的汤姆森系数,传统上汤姆森系数通过泥岩实验测量或应用地震资料经具有垂直对称轴的横向各向同性(VTI)介质非双曲时差速度反演获得。针对这两种方法存在的困难,提出在多口斜井声波资料地层对比的基础上,选取同一层位多口井的测井声波资料,以椭圆方程作为反演模型,采用最小二乘法确定汤姆森系数的新方法,由此实现斜井泥岩声波速度各向异性校正。该方法在渤中地区的实际应用表明,大斜度井中实测声波速度与地层真正垂向速度的差异巨大,校正量达到了20%～30%,为斜井地震正、反演提供了精确的声波速度,提高了斜井测井刻度在地震实际应用中的精度。
The acoustic wave measured in deviated wells recorded the anisotropy of compressional wave in shale.It was necessary to determine the Thomson Coefficient in anisotropic correction,traditionally shale testing or seismic data were used to obtain the Thomson Coefficient by using inversion of VTI media dual curves.In allusion to the problem existed in the 2methods,it was proposed that on the bases of data comparison between many deviated wells,the logging acoustic data of multiple wells in a same horizon were chosen for obtaining the Thomson Coefficient by using an elliptic equation as inversion model and least square method,by which the anisotropic correction was implemented.The application in Bozhong Area indicates that the measured data is much different with of those in actual formation,the correction is as much as 20%～30%,by which accurate acoustic velocity is provided for a seism and inversion in deviated wells and accuracy is improved for the application of deviated well logging calibration.
The acoustic wave measured in deviated wells recorded the anisotropy of compressional wave in shale.It was necessary to determine the Thomson Coefficient in anisotropic correction,traditionally shale testing or seismic data were used to obtain the Thomson Coefficient by using inversion of VTI media dual curves.In allusion to the problem existed in the 2methods,it was proposed that on the bases of data comparison between many deviated wells,the logging acoustic data of multiple wells in a same horizon were chosen for obtaining the Thomson Coefficient by using an elliptic equation as inversion model and least square method,by which the anisotropic correction was implemented.The application in Bozhong Area indicates that the measured data is much different with of those in actual formation,the correction is as much as 20%～30%,by which accurate acoustic velocity is provided for a seism and inversion in deviated wells and accuracy is improved for the application of deviated well logging calibration.
引文
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[3]Tien-when Lo,Coyner K S,Toksijz M N.Experimental determination of elastic anisotropy of Berea sandstone,Chicopee shale,and Chelmsford granite[J].Geophysics,1986,51(1):164～171.
[4]付强,罗彩明.基于VTI介质理论的P波速度分析和动校正[J].物探化探计算技术,2008,(1):10～16.
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[6]邓继新,史哥,刘瑞珣,等.泥岩、页岩声速各向异性及其影响因素分析[J].地球物理学报,2004,47(5):862～868.
[7]Wang Zhijing.Seismic anisotropy in sedimentary rocks,part1:A single～plug laboratory method[J].Geophysics,2002,67(5):1415～1422.
[8]Wang Zhijing.Seismic anisotropy in sedimentary rocks,part2:Laboratory data[J].Geophysics,2002,67(5):1423～1440.
[9]Leon Thomsen.Weak elastic anisotropy[J].Geophysics,1986,51(10):1954～1966.
[10]Hornby B E,Schwartz L M,Hudson J A.Anisotropic effective-medium modeling of the elastic properties of shales[J].Geophysics,1994,59(10):1570～1583.
[2]Hornby B E,Howiez J M,Ince D W.Anisotropy correction for deviated-well sonic logs:Application to seismic well tie[J].Geophys-ics,2003,68(2):464～471.
[3]Tien-when Lo,Coyner K S,Toksijz M N.Experimental determination of elastic anisotropy of Berea sandstone,Chicopee shale,and Chelmsford granite[J].Geophysics,1986,51(1):164～171.
[4]付强,罗彩明.基于VTI介质理论的P波速度分析和动校正[J].物探化探计算技术,2008,(1):10～16.
[5]卢明辉,唐建侯,胡彬,等.VTI介质P波非双曲时差分析[J].地球物理学进展,2005,20(2):328～331.
[6]邓继新,史哥,刘瑞珣,等.泥岩、页岩声速各向异性及其影响因素分析[J].地球物理学报,2004,47(5):862～868.
[7]Wang Zhijing.Seismic anisotropy in sedimentary rocks,part1:A single～plug laboratory method[J].Geophysics,2002,67(5):1415～1422.
[8]Wang Zhijing.Seismic anisotropy in sedimentary rocks,part2:Laboratory data[J].Geophysics,2002,67(5):1423～1440.
[9]Leon Thomsen.Weak elastic anisotropy[J].Geophysics,1986,51(10):1954～1966.
[10]Hornby B E,Schwartz L M,Hudson J A.Anisotropic effective-medium modeling of the elastic properties of shales[J].Geophysics,1994,59(10):1570～1583.
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