特种油气藏2024，Vol.31Issue(4)：44-53,10.DOI:10.3969/j.issn.1006-6535.2024.04.006
致密砂岩储层可动流体分布特征及主控因素
Distribution Characteristics and Main Controlling Factors of Movable Fluid in Tight Sandstone Reservoir
摘要
Abstract
Due to the significant variation in fluid distribution,complex pore structure,and relatively low percolation capacity of the Chang 8 reservoir in the Fuxian Area of the Ordos Basin,five representative rock samples from the study area were selected for testing and analysis.The primary controlling factors affecting fluid mobility were ana-lyzed using thin section casting,scanning electron microscopy(SEM),X-ray diffraction clay mineral analysis(XRD),and constant velocity mercury injection experiments.The results indicate that the movable fluid saturation in tight sandstone reservoirs ranges from 26.31％to 50.61％,with an average of 35.15％.The pore throat radius for movable fluid is between 0.10 μm and 0.50 μm;the T2 cutoff value falls within the range of 6.69 ms to 49.90 ms,and the minimum pore throat radius for movable fluid is between 0.16 μm and 0.36 µm.The permeability of a res-ervoir exerts greater control over the mobility of fluids than porosity.The median radius,maximum pore throat radi-us,and average pore throat radius exhibit a positive correlation with movable fluid,with the median radius exerting a greater influence.Higher feldspar content facilitates the formation of feldspar dissolution pores,resulting in greater movable fluid saturation.Type Ⅰ and Type Ⅱ reservoirs exhibit high kaolinite content,with pores filled with dis-persed particles.Type Ⅲ reservoirs exhibit high illite and mixed-layer illite content,with pores bridged and seg-mented,leading to pore throat plugging.These research findings provide valuable insights for enhancing the recovery of tight oil reservoirs.关键词
微观孔喉/可动流体/核磁共振/致密砂岩/主控因素/鄂尔多地盆地Key words
microscopic pore throat/movable fluid/nuclear magnetic resonance/tight sandstone/main controlling factors/Ordos Basin分类
能源科技引用本文复制引用
李亚婷,童长兵,韩进,师良,钟高润,赵帮胜..致密砂岩储层可动流体分布特征及主控因素[J].特种油气藏,2024,31(4):44-53,10.基金项目
国家自然科学基金"矿物脉体示踪富有机质页岩中烃类流体形成与演化:以大巴山构造带下寒武统为例"(42362021) （42362021）
延安市2023年科技计划项目"鄂尔多斯盆地中南部致密砂岩储层微观孔隙结构特征对可动流体赋存影响"(2023-CYL-151) （2023-CYL-151）
陕西省2024年自然科学基础研究计划项目"CCS过程原位CO2溶解核磁共振表征模型研究"(2024JC-YBQN-0341) （2024JC-YBQN-0341）
