特种油气藏2024，Vol.31Issue(3)：106-115,10.DOI:10.3969/j.issn.1006-6535.2024.03.014
低渗致密砂岩油藏水驱储层变化规律
The Variation Law of Water Flooding Reservoir in Low Permeability Tight Sandstone Reservoirs
摘要
Abstract
To address the issues of unclear understanding of the variation law of clay minerals and micro-porosity structure within low permeability tight sandstone reservoirs before and after water flooding,the Chang 2 and Chang 6 Reservoirs in Yanchang Oilfield of Ordos Basin were taken as research objects.The types and contents of rock and clay minerals,the characteristics of microscopic pore throat structure are studied by using experimental methods such as casting thin sections,X diffraction and high pressure mercury intrusion,and the variation law of reservoirs before and after water flooding was analyzed.The results show that the microscopic heterogeneity of Chang 6 tight reservoir is stronger than that of Chang 2 low permeability reservoir.After water flooding,the content of illite/Mont-morillonite mixed layer and illite in Chang 2 Reservoir increased,chlorite content and illite/smectite mixed layer ra-tio decreased,and the content of illite/smectite mixed layer,chlorite content and illite/smectite mixed layer ratio in Chang 6 Reservoir decreased.When the pore throat radius is large,the injected water improves the pore throat.On the contrary,the pore throats are damaged by the injected water.The larger the core permeability is,the faster the pressure propagation velocity is,the faster the injected water advances,and the more water is visible at the outlet end.This study can provide technical reference for water flooding development of low permeability tight sandstone reservoirs.关键词
低渗砂岩/致密砂岩/水驱/储层特征/微观孔喉变化/鄂尔多斯盆地Key words
low permeability sandstone/tight sandstone/water flooding/reservoir characteristics/microscopic pore throat variation/Ordos Basin分类
能源科技引用本文复制引用
石立华,师调调,廖志昊,薛颖,李禄胜..低渗致密砂岩油藏水驱储层变化规律[J].特种油气藏,2024,31(3):106-115,10.基金项目
陕西省自然科学基础研究计划"致密砂岩储层微观孔喉结构及薄膜流动对渗吸规律的影响"(2023-JC-YB-423)、"页岩油储层微—纳米孔喉系统量化表征及对可动流体赋存状态控制机理研究"(2022JQ-290) （2023-JC-YB-423）
延长石油集团科技攻关项目"延长西部油区长6油藏不稳定周期注水机理及技术政策研究"(ycsy2022jcts-B-32) （ycsy2022jcts-B-32）
