多项式的井间地震速度场反演方法
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摘要
基于契比雪夫多项式的旅行时反演方法,不需进行入射角扫描,首先用多项式表示出深度和慢度,计算出从源点到接收点的旅行时间,通过与实际时间的误差修改模型参数,经过反复迭代,最终得到地下复杂构造的界面形态和速度变化。与网格化速度反演方法相比,计算的未知数少,对初始地质模型的依赖性小。模型试算表明,在初始地质模型与实际地质模型差别较大时,仍能取得比较好的反演结果。
The method determines the incidence angle for every ray through scanning,and hence has very large computation work and needs to provide a relative precise preliminary geologic model.This paper introduces a kind of travel time inversion method based on polynomial.First,the depth and slowness can be expressed by Chebyshev polynomial.Then the structure and velocity variation of the complex construction can be acquired through iteration.Compared with the grid velocity inversion,this method has less unknown numbers,and does not need to provide a precise preliminary geological model.Model calculations show that the result achieved is close to the actual geologic model.
The method determines the incidence angle for every ray through scanning,and hence has very large computation work and needs to provide a relative precise preliminary geologic model.This paper introduces a kind of travel time inversion method based on polynomial.First,the depth and slowness can be expressed by Chebyshev polynomial.Then the structure and velocity variation of the complex construction can be acquired through iteration.Compared with the grid velocity inversion,this method has less unknown numbers,and does not need to provide a precise preliminary geological model.Model calculations show that the result achieved is close to the actual geologic model.
引文
[1]王世库,刘清林.综合应用井间地震等多种资料确定精细地质模型[J].石油物探,1995,34(4):10.
[2]吴律.层析基础及其在井间地震中的应用[M].北京:石油工业出版社,1997.
[3]裴正林.井间地震层析成像的现状与进展[J].地球物理学进展,2001,16(3):91.
[4]鲁传恒,顾贤明.井间地震射线层析成像[J].CT理论与应用研究,1994,3(3):18.
[5]刘清林.程函方程差分法层析成像[J].石油物探,1995,34(4):14.
[6]W ashbourne J K,Rector J W,Bube K P.C rosswell traveltim estomography in three d im ension[J].Geophysics,2002,67(3):853.
[2]吴律.层析基础及其在井间地震中的应用[M].北京:石油工业出版社,1997.
[3]裴正林.井间地震层析成像的现状与进展[J].地球物理学进展,2001,16(3):91.
[4]鲁传恒,顾贤明.井间地震射线层析成像[J].CT理论与应用研究,1994,3(3):18.
[5]刘清林.程函方程差分法层析成像[J].石油物探,1995,34(4):14.
[6]W ashbourne J K,Rector J W,Bube K P.C rosswell traveltim estomography in three d im ension[J].Geophysics,2002,67(3):853.
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