自适应反射系数无约束反演技术
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摘要
自适应反射系数无约束反演，是在不考虑测井约束的情况下，对地震记录的每一点都求取反算子，然后在该点再进行速归褶积计算，以充分适应不同深度上地震子波变化的特点。因此，此法要比普通分段脉冲反褶积求解反射系数的精度高得多。由此方法得到的反射系数剖面，能清楚地反映出小薄层、小砂体、小断层和小构造，其分辨率可达到1／4波长。该方法对弱反射层尤为有利，它是在偏移剖面上实现的，并要求高故频不低于50Hz。
Without restriction of log data, adaptive unrestricted inversion of reflection coefficients involves estimating anti-operator at each point of seismogram, then conducting recursive convolution at the point so as to adapt to seismic wavelet variations at different depths. As a result,this method offers much better reflection coefficients than ordinary segmental pulse deconvolution does. Reflection coefficientsections produced by this method show clear laminations, minor sand bodies, smallfaults and small structures, with resolution of 1/4 wavelength. The method is particularly favourable to weak reflection horizons. The method applies to migrated seismic section, and it requires that high-cutoff frequency is not below 50 Hz.
Without restriction of log data, adaptive unrestricted inversion of reflection coefficients involves estimating anti-operator at each point of seismogram, then conducting recursive convolution at the point so as to adapt to seismic wavelet variations at different depths. As a result,this method offers much better reflection coefficients than ordinary segmental pulse deconvolution does. Reflection coefficientsections produced by this method show clear laminations, minor sand bodies, smallfaults and small structures, with resolution of 1/4 wavelength. The method is particularly favourable to weak reflection horizons. The method applies to migrated seismic section, and it requires that high-cutoff frequency is not below 50 Hz.
引文
1 燃料化学工业部石油地球物理勘探局计算中心站等编.地震勘探数字技术,科学出版社,1973
2 刘企英.高信噪比、高分辨率和高保真度技术的综合研究.石油地球物理勘探,1994,29(5):610～622
3 李庆忠.走向精确勘探的道路,石油工业出版社,1994
4 俞寿朋.高分辨率地震勘探,石油工业出版社,1993
5 朱生旺.信号方向约束叠后噪声压制.石油地球物理勘探,1996,31(3):423～429
6 钱忠平等.一种自动识别和压制地震资料中高频噪声方法.石油地球物理勘探,1997,32(3):318～326
2 刘企英.高信噪比、高分辨率和高保真度技术的综合研究.石油地球物理勘探,1994,29(5):610～622
3 李庆忠.走向精确勘探的道路,石油工业出版社,1994
4 俞寿朋.高分辨率地震勘探,石油工业出版社,1993
5 朱生旺.信号方向约束叠后噪声压制.石油地球物理勘探,1996,31(3):423～429
6 钱忠平等.一种自动识别和压制地震资料中高频噪声方法.石油地球物理勘探,1997,32(3):318～326
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