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以滩坝砂岩为代表的低渗透砂岩储层是现今勘探的热点和难点。利津洼陷沙四段上亚段滩坝砂岩储层主要以滨浅湖相沉积为主,具有储层厚度薄,岩石颗粒细,孔隙结构复杂等特点,深入研究其储层特点并进行有效储层划分将为储量上报提供重要参考。本文在综合分析岩心、录井、测井、试油等资料的基础上,对利津洼陷沙四段上亚段滩坝砂岩储层的岩性特征、物性特征、测井响应特征进行了系统分析,建立了研究区有效储层岩性、含油性、物性、电性下限标准,并根据本地区特点,用电阻率构建了一条补偿密度界限曲线,能较为准确地进行有效储层的识别,达到了客观识别和评价油层的目的。该研究思路和方法对胜利东部探区陆相低渗透储层评价具有一定的指导和借鉴意义。
Low-permeability sandstone reservoirs, such as beach-bar sandstone, are the hot spots and difficulties in current exploration. The sandstone reservoirs of beach bar and dam in the upper section of Es4 in Lijin Sag mainly consist of shallow and shallow lacustrine sediments. They are characterized by thin reservoir thickness, fine rock particles and complex pore structure. The characteristics of the reservoirs are thoroughly studied and the effective reservoir Layering will provide an important reference for reserve reporting. Based on the comprehensive analysis of the data of core, logging, well logging and oil testing, the lithology characteristics, physical properties and logging response characteristics of sandstone reservoirs in beach and sandstones of Upper Reaches of Shahejie Formation in the Lijin Sag are systematically studied According to the characteristics of this area, a compensation demarcation limit curve is established with the resistivity, which can accurately identify the effective reservoirs, Achieve the objective identification and evaluation of the purpose of the reservoir. The research ideas and methods have some guidance and reference significance for the evaluation of continental low permeability reservoirs in the eastern exploration area of Shengli.