Abstract: After the low permeability oil field of Ansai enters the medium and high watercut stage, the main oil reservoir is washed, the production of many wells is low, and the direction of remaining oil digging is unknown. Taking Chang 6 oil layers of Yanchang formation in Wangyao area as the object, on the basis of modern sedimentology, highresolution sequence stratigraphy, basic logging theory and development geology, combining the rock outcrop, sealing core drilling in-spection well and test data, the characteristics of single oil sands scale reservoir heterogeneity, injection and mining connectivity and distribution of residual oil are revealed. The results show that the heterogeneity of single sand bodies has an important influence on the water flooding process of low permeability reservoir, and it also has important inspiration for the division and combination of the development oil layer, the form of well network and the adjustment of water injection. The recovery rate is increased by 4%~6% through comprehensive adjustment as pattern infilling, adjustment of injection-production relation of the single sand body, the precise fracturing and profile control.

Key words: Ultra-low permeability reservoir, Single sand bodies, Residual oil, Potential tapping

摘要： 安塞特低渗透油田进入中高含水期后，主力油层普遍遭到水洗，多井低产，剩余油挖潜方向不明。以王窑区为例，基于现代沉积学、高分辨率层序地层学、测井及开发地质学理论基础，结合野外露头、检查井取心及开发测试资料，揭示了单油砂体尺度储层非均质特征、注采连通状况及剩余油分布规律。研究表明，单砂体非均质性对低渗透油藏水驱过程具有重要影响，对开发层系划分组合、井网形式及井排距选择、注水开发调整具有重要启示。通过开展缩小井排距加密调整、单砂体注采对应关系完善、精准压裂、调驱调剖等综合调整，预测采收率提高4%~6%，对同类油田中后期稳产意义重大。

关键词: 特低渗透储层, 单砂体, 剩余油, 综合调整