DF气田地震相分类研究及综合应用

Classification research and comprehensive application of seismic facies in DF gas field

地震相作为地震信号的初始表征,其内部结构及外部形态对储层沉积相及展布特征有至关重要的指示意义。但随着数字信息技术高度发展,各种储层预测及烃类检测技术手段的广泛应用,传统地震相所代表的基本地质信息往往被地质工作者忽略。而DF气田作为中国海上目前最大的千亿方级在生产气田,井资料较少,地震相所代表的地质信息更加重要。这里研究总结了影响气田储层连通性及物性展布的地震相表征,并结合生产动态等信息进行归类拟合,将复杂地震相进行定量化识别。在此基础上,结合物源、沉积体空间展布,水动力分析等信息反演沉积相,沉积模式由滨浅海滩坝沉积转为重力流海底扇沉积。沉积模式的变化及地震相的微观识别对重新落实储层有利区带及储层非均质性定量刻画有着重大帮助,对气田日常生产管理、动态分析、开发井井位部署以及后期生产调整起到关键指导作用。

As the initial representation of seismic signal,the internal structure and the external shape of the seismic facies are very important to the reservoir sedimentary and its distribution characteristics.With the high speed development of digital information technology,various methods of the reservoir prediction and hydrocarbon detection technology are widely used,and the basic geological information represented by traditional seismic facies are often ignored by geologists.As the largest gas field in production with one hundred billion of cubic meters gas in China offshore,DF gas field has less well data,and the geological information represented by the seismic facies is more important.This study summarizes the seismic facies characterizations which influence on the distribution of reservoir connectivity and physical property,classifies and fits the seismic facies combining with production dynamic information,and quantitatively identifies complex seismic facies.On the basis of these,we inversed the sedimentary facies with the sedimentary source,the spatial distribution of the sedimentary bodies and hydrodynamic analysis,and sedimentary model changes from beach-bar in shore and shallow sea to gravity flow of submarine fan.This change and the micro-identification of seismic facies have great help to remark favorable reservoir zones and quantitatively identify reservoir heterogeneity.At the same time,they also play a key role in guiding daily gas production management,dynamic analysis,as well as the well deployment of development wells and the adjustment of later production.