地震高频检测技术及其应用

High frequency seismic detection technique and its application.

地震高频检测技术是一项基于粘弹性波动理论 ,提取地震波相对高频成分用于检测储集层的孔隙度大小及含流体性质的新技术。虽然有许多学者在用地震波的频率参数预测储集层及含油气性质方面做过大量的研究工作 ,但多因为频谱的“时 频”性较差而影响了其实用性。而该文采用的小波谱具有优越的“时 频”特性 ,解决了傅氏谱不能解决的问题。理论及实际效果分析表明 ,高频检测是预测碳酸盐岩储集层的有效方法 ,该方法在充分利用地震波的频率信息预测岩性及油藏领域方面开辟了一新思路 ;该方法对储集层中含油或水反应灵敏 ,但对气藏预测效果不太理想 ;该方法要求上覆地层岩性变化相对简单 ,即目的层顶面处地震信号频谱应基本一致。该方法在实际生产中取得了理想的效果。图 3参 3 (邹冬平摘 )

This paper suggests, for the first time, a new technique with that relatively high frequency part of seismic wave is extracted by small wavelet transformation for the detection of porosity and fluids contained based upon a viscoelastic wave movement theory. Although before the publication of this paper, many scientists have done a great deal of research work on the prediction of petrophysical properties of reservoir rock and properties regarding to its oil/gas containment by frequency parameters in seismic waves, yet the actual applicability is limited due to the fact that inferior “time frequency” relation of the wave spectrum occurred usually. Small wave spectrum suggested in this paper have a superior “time frequency” relationship, and can solve problems which cannot be solved by Fourier's spectrum. Theoretical and actual result analyses show that high frequency detection is an effective method in the prediction of carbonate reservoir beds. This method gives a new idea in the prediction of lithology and the area of an oil reservoir. It is very sensitive to oil or water contained in the reservoir but is less sensitive to gas. This method requires a relatively simple overburden rocks, i.e. the wave spectrum of seismic waves at the top of reservoir beds are basically uniform. Ideal effects have been obtained in actual cases by this method.