OpendTect系统在层序地层研究中的应用

在等时层序格架建立的基础上，利用地震资料研究各体系域内部沉积体的空间展布、叠置样式和沉积演化过程,进而预测各体系域中砂体的分布，是层序地层学应用于勘探实践的重要内容.OpendTect系统在三维地震倾角扫描的基础上，①以地震采样点空间信息为导向，实现了层序界面控制下的地震小层自动追踪，可以精细刻画出体系域内部沉积体地震反射结构和空间展布；②通过对各层序单元内部地震小层追踪结果进行层拉平，实现了时间域到Wheeler域的自动变换，可以更加直观地分析地层沉积演化历史；③通过沿沉积体内部小层面提取地震属性，实现了等时地层切片的提取，减少了地震属性多解性，提高了预测精度.OpendTect系统提供了一种新的基于层序地层的地震综合解释技术和思路.

Application of OpendTect system in sequence stratigraphy research

It is an important content of sequence stratigraphy applying in exploration practice that predicting distribution of sandstone through using the seismic data to study deposition spatial distribution, superposition style and sediment evolution in the various system tracts on the basis of isochronal sequence framework. Based on 3D seismic dip scanning,①Taking spatial information of seismic sampling points as guidance, OpendTect system realizes auto-tracking of seismic sublayer under the control of the sequence interfaces. It can finely portray seismic reflection configuration and spatial distribution of sedimentary bodies in the system tracts.②It realizes automatic transformation from time domain to Wheeler domain by flattening seismic sublayer auto-tracked in sequence units. In this way, we can intuitively analyse the history of the sedimentary evolution.③It realizes predicting the distribution of sand in the isochronal stratal slice by extracting seismic attributions along the sublayer in the sedimentary bodies. OpendTect system offers a new kind of seismic integrated interpretation technology and ideas which are based on the sequence stratigraphy. It is an effective and applied tool of seismic interpretation and geology analysis.