基于谱分析的谱峰数预测薄互层砂岩厚度

Sandstone high prediction of alternating beds with spectral peak number on spectral analyses

通过陷频分析,在讨论单层厚度地震谱特征基础上,针对利用多层地层的地震谱方法预测厚度这一难题,在研究各类多层模型的谱特征后,总结出砂岩厚度、岩性与地震谱谱极值大小变化规律,并以此分析方法为依据,研究了利用谱峰数预测砂岩厚度的方法.

hrough the pitfall frequency analysis and on the basis of discussing the seismic spectrum of monolayer thickness,the problem that using the multilayered stratigraphic seismic sopectrum method to predict the thickness,concludes sandstone thickness,lithology and the variation of extreme of the sesimic spectrum after researching multilayer model spectral characteristics,and based on this method,it forecasts sandstone thickness by peak numbers.In the method,first established the quantitative calculation equation of sandstone thickness,lithology and the different extreme of seismic amplitude spectrum,threshold value and the corresponding peak number of spectrum.Through the equation,the threshold value,the selection of windows and the ploblem of variable window spectrum calculation has been resolved,and results in the formation of sandstone thickness calculated formulation.By the calculation of validating the thickness and the thickness of the analysis,the average relative error and average absolute errors are respectively 0.12 and 2.42,which proves that this method results in a relatively good effect.