薄砂体储层定量预测技术应用研究——以WZ工区为例

单层厚度小于1/4个波长的薄层砂体,其厚度已经小于传统意义上的地震垂向分辨率。但是研究认为,在调谐效应下,薄层砂体厚度与地震反射振幅是存在线性相关关系的。利用这一特征,对WZ工区内两种不同类型的薄层砂体——大套泥岩夹单层砂体和砂泥岩薄互层砂体分别开展定量储层预测研究,通过体雕刻技术直接定量预测单砂体的厚度,通过层段的纵波阻抗平均值预测薄互层砂体总体厚度,最终获得薄层砂体的平面展布特征和厚度变化趋势。

Application of thin-layer sandstone quantitative prediction technology:taking WZ work area as an example

For thin-layer sandstone with thickness less than 1/4 wavelength,its thickness is less than traditional seis-mic vertical resolution.But the research shows that there is a linear correlation relationship between the layer thickness and seismic reflection amplitude of thin layer sandstone in tuning effect.Taking advantage of this feature,we conducted quanti-tative reservoir prediction study on two different types of thin sandstone:a single sandstone within large set of mudstone and thin sand-shale interbeded.The body sculpture technology was directly used to quantitatively predict the thickness of sin-gle sandbody,and the total thickness of the thin interbeded sandstone was predicted by the zonal compressional wave im-pedance average value.Finally we obtained the plane distribution feature and thickness change trends of thin layer sand-stone.