东营凹陷始新世滩坝砂岩有效储层地震预测

Seismic prediction of effective reservoir in Eocene bearh-bar sandstone of Dongying depression

滩坝砂岩是东营凹陷始新世晚期广泛发育的沉积类型,具有埋藏深、厚度薄、互层结构等特点,地震预测难度大。笔者针对滩坝砂岩在开发阶段如何区分滩砂与坝砂的关键问题,提出了应用"分频预测、多属性降维、反射系数反演"等多种地球物理方法解决有效储层描述的研究方案,实现了滩坝砂岩储层预测定性到定量的技术转变。该方法在具有同样的薄互层结构的沉积类型的描述中具有一定的推广意义。

Late Eocene beach bar sandstone constitutes an important reservoir type in Dongying depression. As the beach bar sandstone is thin and interbedded with mudstone,it is difficult to identify it from normal seismic data. Aimed at solving the key issues of the beach bar sandstone existent at the development stage,the authors proposed the employment of a variety of geophysical methods such as frequency division multiple attribute dimension reduction and reflection coefficient inversion to solve the problem of effective reservoir microscopic description. The transformation from qualitative prediction to quantitative prediction is realized in the beach bar sandstone reservoir prediction studies. These methods have certain promoting significance for the description of the same sedimentary type.