基于熵谱特征定量计算薄层厚度的方法研究
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摘要
讨论了基于地震资料的熵谱特征定量计算薄互层厚度的原理。首先对谱均衡后的地震数据作归一化处理,然后对处理结果作最大熵谱估计,若估计结果的谱分辨率精度不能满足要求,则先对归一化的地震记录叠加适当的白噪声,然后再作最大熵谱,这样可以得到较高的估计精度。另外,文中对流程中关键步骤之一的最大熵谱估计进行了改进,并给出了基于相关技术用于从谱上提取周期的方法,提高了谱周期的估计精度。文中用合成地震数据证明了其有效性。
The estimate of thin interbeds' thickness base d on entropy-spectral p roperties is discussed on the theory in this paper. First the spectrum-equalize d seismic data is equalized by trace, then the result is analyzed with the MESE. I f the resolving power of the MESE doesn't reach the precision desire, the equal ized data is added with appropriate white noise, then is analyzed with the MESE. Thus the more precise spectral estimate is gotten. In this paper,one of the key steps, the maximum entropy spectral estimate (MESE) is ameliorated and it propo ses the method of picking up the period of the spectrum based on the correlation technique and improves the estimate precision of the spectrum period. At last we testify the validity with synthesized seismic data.
The estimate of thin interbeds' thickness base d on entropy-spectral p roperties is discussed on the theory in this paper. First the spectrum-equalize d seismic data is equalized by trace, then the result is analyzed with the MESE. I f the resolving power of the MESE doesn't reach the precision desire, the equal ized data is added with appropriate white noise, then is analyzed with the MESE. Thus the more precise spectral estimate is gotten. In this paper,one of the key steps, the maximum entropy spectral estimate (MESE) is ameliorated and it propo ses the method of picking up the period of the spectrum based on the correlation technique and improves the estimate precision of the spectrum period. At last we testify the validity with synthesized seismic data.
引文
[1] GregPartykaetal.InterpretationalApplicationsofSpectralDecompo sitioninReservoirCharacterization[J].Theleadingedge,1999,18,(3):353-360.
[2] DavidA ,Okaya.SepectralPropertiesoftheEarth’sContributiontoSeismicResolution[J].Geophysics,1995,60(1):241-250.
[3] 黄绪德.薄层陷频法[J].勘探地球物理进展,2002,25(5):1-6.
[4] 刘建华,刘天放,李德春.薄层厚度定量解释研究[J].物探与化探,1997,21(2):23-27.
[5] 汪恩华,贺振华,李庆忠.基于薄层的反射系数谱理论与模型正演[J].成都理工学院学报,2001,28(1):70-74.
[6] 袁子龙,杨冰,王建国.薄层、薄互层地震反射时间域与频率域正演模拟研究及应用[J].石油物探,1996,35(3):14-20.
[7] 邵治龙,贺振华,黄德济.小波变换与最大熵法联合计算薄层厚度[J].石油地球物理勘探,1998,33(2):204-214.
[8] KoefoedO ,VoogdN .de.Thelinearpropertiesofthinlayers,withanapplicationtosyntheticseismogramsovercoalseams[J].Geophysics,1980,45(8):1254-1268.
[9] WidessMB .Howthinisathinbed[J].Geophysics,1997,38(6):1176-1180.
[10] 于锡胜译.谱均衡,一种改进地震资料质量的方法[J].国外石油地球物理进展,1987,(1):20-30.
[11] 陈必远,马在田.优势频率约束下的递推f-x去噪和谱均衡方法[J].石油地球物理勘探,1997,32(4):575-582.
[12] 张贤达.现代信号处理[M].北京:清华大学出版社,2002
[2] DavidA ,Okaya.SepectralPropertiesoftheEarth’sContributiontoSeismicResolution[J].Geophysics,1995,60(1):241-250.
[3] 黄绪德.薄层陷频法[J].勘探地球物理进展,2002,25(5):1-6.
[4] 刘建华,刘天放,李德春.薄层厚度定量解释研究[J].物探与化探,1997,21(2):23-27.
[5] 汪恩华,贺振华,李庆忠.基于薄层的反射系数谱理论与模型正演[J].成都理工学院学报,2001,28(1):70-74.
[6] 袁子龙,杨冰,王建国.薄层、薄互层地震反射时间域与频率域正演模拟研究及应用[J].石油物探,1996,35(3):14-20.
[7] 邵治龙,贺振华,黄德济.小波变换与最大熵法联合计算薄层厚度[J].石油地球物理勘探,1998,33(2):204-214.
[8] KoefoedO ,VoogdN .de.Thelinearpropertiesofthinlayers,withanapplicationtosyntheticseismogramsovercoalseams[J].Geophysics,1980,45(8):1254-1268.
[9] WidessMB .Howthinisathinbed[J].Geophysics,1997,38(6):1176-1180.
[10] 于锡胜译.谱均衡,一种改进地震资料质量的方法[J].国外石油地球物理进展,1987,(1):20-30.
[11] 陈必远,马在田.优势频率约束下的递推f-x去噪和谱均衡方法[J].石油地球物理勘探,1997,32(4):575-582.
[12] 张贤达.现代信号处理[M].北京:清华大学出版社,2002
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