一种叠加速度分析新方法
|
摘要
本文依据速度分析原理及L1和L2 范数的滤波特性 ,假设经过动校正的中心点道集中 ,任何一个时刻地震信号的采样值与炮检距平方满足一阶线性方程 ,提出了一种叠加速度分析新方法。该方法通过对沿着由t0 时间和叠加速度决定的双曲线延迟数据中提取的地震信号进行L1和L2 范数混合滤波 ,来实现噪声和信号的分离。由此 ,我们可以估计信噪比和设计合适的速度检测因子 ,从而提高速度分析的精度。我们用实例验证了该方法的可靠性和实用性。
This paper presents a new velocity analysis method. On the basis of velocity analysis principle and filtering character of norm L 1 and L 2 , the method assumes that seismic signals and square offsets comply with a certain one order equation at each time for gathers with moveout corrections. Signals and noises are decomposed by hybrid filtering of norm L 1 and L 2 from seismic data obtained along the hyperbolic curve determined by t0 times and stack velocity. Furthermore, both signal to noise ratio and velocity detection factors can be estimated. Thus the precision of velocity can be improved. The real data results show that the method is practical and feasible.
This paper presents a new velocity analysis method. On the basis of velocity analysis principle and filtering character of norm L 1 and L 2 , the method assumes that seismic signals and square offsets comply with a certain one order equation at each time for gathers with moveout corrections. Signals and noises are decomposed by hybrid filtering of norm L 1 and L 2 from seismic data obtained along the hyperbolic curve determined by t0 times and stack velocity. Furthermore, both signal to noise ratio and velocity detection factors can be estimated. Thus the precision of velocity can be improved. The real data results show that the method is practical and feasible.
引文
1 KeySCandSmithsonSB .Newapproachtoseismicreflectioneventdetectionandvelocitydetermi nation .Geophysics,1990 ,55(10 ) :10 57～ 10 6 9
2 BiordiBetal著 .使用特征结构法计算高分辨率速度谱 .唐权均译 .第 58届SEG年会论文集 .北京 :石油工业出版社 ,1989,2 4 2～ 2 4 7
3 刘洋 .基于傅氏变换特点的一种速度分析新方法 .石油地球物理勘探 ,1995,30 (3) :32 9～ 336
4 李宏兵 .高精度速度分析 .石油地球物理勘探 ,1994 ,2 9(4 ) :4 74～ 4 82
5 吕景贵 ,管叶君 .P波剖面的分步最优化拟合方法 .石油地球物理勘探 ,1998,33(增刊 2 ) :2 3～2 6
6 牟永光 .地震勘探资料数字处理方法 .北京 :石油工业出版社 ,1981
2 BiordiBetal著 .使用特征结构法计算高分辨率速度谱 .唐权均译 .第 58届SEG年会论文集 .北京 :石油工业出版社 ,1989,2 4 2～ 2 4 7
3 刘洋 .基于傅氏变换特点的一种速度分析新方法 .石油地球物理勘探 ,1995,30 (3) :32 9～ 336
4 李宏兵 .高精度速度分析 .石油地球物理勘探 ,1994 ,2 9(4 ) :4 74～ 4 82
5 吕景贵 ,管叶君 .P波剖面的分步最优化拟合方法 .石油地球物理勘探 ,1998,33(增刊 2 ) :2 3～2 6
6 牟永光 .地震勘探资料数字处理方法 .北京 :石油工业出版社 ,1981
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心