长轴缓坡辫状河三角洲前缘储层构型研究

Reservoir architecture of braided delta front on gentle slope

为了探讨长轴缓坡辫状河三角洲前缘储层构型模式,采用层次界面分析及"层次约束,模式拟合,多维互动"的构型表征方法对长轴缓坡背景下的辫状河三角洲前缘不同级次的构型进行精细解剖,得出在不同构造背景下三角洲储层构型样式具有较大的差异性。研究表明:辫状河三角洲前缘主要发育分流水道、河口坝、席状砂等构型要素,其中6级、7级、8级及9级界面限定的构型单元分别为单层微相复合体、单一微相复合体、单一微相、微相内部增生体。不同级次的构型单元具有不同的叠置样式和识别依据。在对多级构型要素定性定量识别基础上,建立了以分流水道与河口坝为主体的长轴缓坡辫状河三角洲前缘储层构型模式。

The hierarchy bounding surface method,hierarchical constraint,model fitting,and multi-dimensional interaction have been applied to investigate reservoir architecture of braided delta front on gentle slope.Results show：different hierarchical architecture elements in braided delta fronts.The studied area mainly develops distributed channel,mouth bar,sheet-shape sand,among which are the compound of micro-facies within a single layer,compound of single micro-facies,single micro-facies and accretion inside the micro-facies are separately defined by the 6th,7th,8th and 9th architecture boundary surfaces.Different hierarchy architecture elements have significant difference on overlapping patterns.On the basis of qualitative and quantitative identification of multi-stage configuration elements,three dimensional architecture model of braided delta front develops in the long axis of gentle slope,which is dominated by distributary channel and mouth bar,has been set up.