三角洲前缘亚相储层单砂体识别方法的研究

Delta Front Subfacies Reservoir Recognition Method of Single Sand Body

在精细地质研究的基础上，进行了三角洲前缘亚相席状砂单砂体识别，总结出平面上大面积分布的三角洲前缘亚相席状砂实际上是众多单砂体的组合。根据席状砂发育特点，确定单砂体的3种成因类型：溢岸型、决口型和河口叶状体。并归纳了三角洲前缘亚相储层单砂体的识别方法与原则，即从不同类型砂体的成因入手，根据徽相组合关系、厚度演变趋势、测井曲线微细差别、泥岩尖灭区的分布规律等特征综合分析，闭合对比，实现对单一砂体的追溯与识别。并为高含水后期油田调整挖潜、更精确地认识剩余油分布状况提供了可靠的地质依据。

On the basis of fine geologic research,the single sand body recognition of sand sheet in delta front facies was carried out,it was summed up that the front plane of large distribution of sand sheet in the delta front was actually a combination of many single sand bodies.According to the characteristics of sand sheet development,3 types of the development single sand body genesis were determined: such as excessive shore type,run type and estuary leafy body.The single sand body identification method and principle were summarized,namely starting from the genesis of different sand bodies,a comprehensive analysis was performed and closure was contrasted based on the microfacies combination relations,the thickness evolution tendency and the logging curve subtle differences and the distributive regularity of pinchout shale.And it provides a reliable geologic basis for oilfield adjustment at high water-cut stage and more accurate understanding of remaining oil distribution situation.