海洋地质前沿2026，Vol.42Issue(6)：38-50,13.DOI:10.16028/j.1009-2722.2025.189
渤海湾盆地埕北低凸起A块东营组储层特征及水驱剩余油分布规律研究
Reservoir characteristics and distribution of water-flooded residual oil in the Dongying Formation of Block A,Chengbei Low Uplift,Bohai Bay Basin
摘要
Abstract
Block A of Chengbei Low Uplift is a key development block in the Bohai Bay Basin.Since its com-mencement of production,it has achieved a considerable scale of oil and gas output.However,challenges such as unclear reservoir characteristics,rapid water-cut rise in water-cut development,and ambiguous distribution of re-sidual oil,which seriously hindered the efficient exploitation of oil and gas in this area.By combining seismic,logging,coring,and dynamic development performance,the reservoir characteristics and water-driven residual oil distribution law in Block A were studied.Results show that the reservoirs of the 9th sand unit(Ed9)and the 8th sand unit(Ed8)of the Dongying Formation,the main oil-bearing units in the study area,are turbidite channel sand bodies of deep lake-semi-deep lake facies.The reservoir lithology is mainly medium-fine-grained lithic arkose,with mainly medium-porosity,medium-low permeability,and high heterogeneity.The Ed8 reservoir was mainly developed in the 6th subunit(Ed86),and the Ed9 reservoir is mainly developed in the 5th subunit(Ed95).These sandbodies have good continuity,distribute widely,and thin out from southwest to northeast.The development of the study area can be divided into four stages:natural energy development,enhanced water injection,sparse-well water-driving,and overall adjustment.In the first stage,natural energy was produced with largely no water;sub-sequent enhanced water injection supplemented the energy build-up in the reservoir but became watery rapidly,resulting in serious water flooding in the eastern wells.Horizontally,the residual oil in Ed9-Ed8 is mainly distrib-uted in the southwest of the study area;and vertically,the residual oil is mainly distributed in the 1st single sand-body unit of Ed8(Ed86-1),the 1st single sandbody unit of Ed95(Ed95-1)and the 2nd single sandbody unit of Ed95(Ed95-2).The sandbody thickness is the main factor on the distribution of residual oil,while the areas with thick sandbody tend to be rich in residual oil.The structural shape played a role in controlling the distribution of the re-sidual oil.The southern part of the production block often has a higher residual-oil abundance due to its high structural position.This study provided a basis for adjusting the development plan and improving the recovery rate in this area as a valuable reference for the development of similar oil and gas reservoirs in the Bohai Bay Basin.关键词
储层预测/剩余油分布规律/数值建模/埕北低凸起/渤海湾盆地Key words
reservoir prediction/distribution law of residual oil/numerical modeling/Chengbei Low Uplift/Bo-hai Bay Basin分类
海洋科学引用本文复制引用
黄文欢..渤海湾盆地埕北低凸起A块东营组储层特征及水驱剩余油分布规律研究[J].海洋地质前沿,2026,42(6):38-50,13.基金项目
国家科技重大专项重点项目"先导试验区提高水驱采收率应用研究"(2011ZX05011-003) （2011ZX05011-003）
