内蒙陆西凹陷层速度分析及岩性预测

作者根据大量地震剖面和速度谱资料,计算、分析了陆西凹陷上侏罗统地震层速度及其分布特征,制定出该区砂、泥岩解释量版,利用声波层速度资料进行了平滑及压实校正,最后计算了各层段的砂岩百分比含量。通过层速度分析和岩性解释,确定了它们与地震相和沉积相之间的对应关系,为有利相带的预测提供了定量依据。 

AN INTERVAL VELOCITY ANALYSIS AND LITHOLOGICAL PREDICTION IN THE LUXI DEPRESSION,INNOR MONGOLIA

On the basis of abundant data of seismic profiles and velocity spectra,the authors of this paper firstly calculated and analysed the seismic interval velocity and distributive characteristics in the upper Jurassic of the Luxi Depression,Innor Mongolia;then drafted the master curves of sandstones and mudstones in the area.Thereafter,the percentages of sandstones in various intervals are estimated by using acoustostratigraphic smooth and correlation of compactions.Based on the analysis of interval velocity and interpretation of lithology,the correlative relation among the velocity,seismic facies and sedimentary facies could be comfirmed and it would provide quantitative basis for prodicting favourable facies belts in the study area.