【摘要】 为考证振幅属性与砂体累计厚度之间的关系及振幅切片在时间上的变化与砂体沉积演化的关系,文中设计了三个薄互层地质模型,利用褶积模型形成三维数据体,据此进行地震属性分析实验。实验结果表明:①对于子波干涉之后形成一个复合波的薄互层地层而言,振幅切片能够定性地反映砂体累计厚度的变化情况,且反射振幅与累计厚度成正相关关系,不同深度振幅切片之间的变化可以定性地反映沉积砂体的演化过程;②对于薄层干涉之后形成多个复合波的薄互层地层而言,振幅切片能够定性地反映砂体在横向上的分布范围,但反射振幅与砂体厚度不一定具有正相关关系,不同深度振幅切片之间的变化依然能够在一定程度上反映沉积砂体的演化过程,但两者之间的相关性较第一种情况明显变弱;③反射振幅和沉积砂体之间的相关性并不具备时间上的等时性。更多还原

【Abstract】 In order to verify the relationship between the amplitude attribute and the cumulative thickness of a sand body,as well as the relationship between the variation of amplitude slice with depth and the sedimentary evolution of a sand body,three thin interbeded models were established in this paper and the experiment of seismic attribute analysis was carried out based on the models and the 3D synthetic data volume simulated by using the convolution method.The experiment results indicate that:(1) as for the thin interbed with single complex wave formed after wavelet interference,the amplitude slice can qualitatively reflect the changing of cumulative thickness of sand body and it shows a positive correlation between the reflection amplitude and the cumulative thickness,and the change of the amplitude slice in different depth can qualitatively reflect evolution process of the sedimentary sand body,(2) for the thin interbed with several complex waves formed after interference,the amplitude slice can qualitatively reflect the lateral distribution range of sand body.However,it does not always show the positive correlation between the reflection amplitude and sand body thickness,and the change of the amplitude slices in different depths can still reflect evolution process of the sedimentary sand body in a certain extent,but the correlation becomes weaker compared with the first situation,and(3) the correlation between reflection amplitude and the sedimentary sand body is not the time isochronic.更多还原