Abstract: Geological knowledge about microfacies sand bodies gives the foundation for stochastic reservoir modeling.The geological knowledge mainly comes from fine description of outcrops,modern sedimentations and dense spacing areas.The fine description of dense spacing areas is an effective and worthwhile way to set up the geological knowledge database of reservoir in old oilfields of East China.A prototype framework model of fan-delta front was established by applying data from dense spacing area of Shuanghe Oilfield.The geometrical features and bifurcation laws of subaqueous distributary river channel were obtained.The quantitative geological knowledge about the probability distribution of length and width of microfacies sand bodies and the ratios of length to width and width to thickness were presented.The results provide a substantial base for fine description of reservoir in Shuanghe Oilfield in the late period of oilfield development.

Key words: Shuanghe Oilfield, fan-delta front, microfacies sand body, reservoir description, prototype framework model, geological knowledge database

摘要： 微相砂体的地质知识是储层随机建模的基础.地质知识来源于对现代沉积区、露头区和密井网区的精细解剖,其中密井网区的精细描述是在我国东部老油田建立储层地质知识库时的一条有效途径.利用双河油田密井网数据,建立了扇三角洲前缘原型骨架模型,研究了水下分流河道砂体的几何形态及分叉规律,获得了微相砂体的长度概率分布、宽度概率分布、宽-厚比关系和长-宽比关系等定量地质知识,为双河油田开发后期储层的精细表征提供了扎实的基础.

关键词: 双河油田, 扇三角洲前缘, 微相砂体, 储层表征, 原型骨架模型, 地质知识库