特种油气藏2025，Vol.32Issue(6)：107-115,9.DOI:10.3969/j.issn.1006-6535.2025.06.013
块状疏松砂岩油藏优势渗流通道综合评价方法
Comprehensive evaluation method for preferential seepage channels in massive unconsolidated sandstone reservoirs
摘要
Abstract
To address the adverse impact of preferential seepage channels formed during long term water flooding in unconsolidated sandstone reservoirs on development performance,this study takes Z Oilfield as a case study to pro-pose a refined identification method for preferential seepage channels in massive unconsolidated sandstone reservoirs by integrating geological data with production dynamics and employing comprehensive evaluation algorithms,numeri-cal simulation and reservoir engineering methods.The study shows that preferential seepage channels in Area Y can be classified into three intensity grades(strong,moderate and weak)based on their developmental characteristics,reservoir damage degree and waterflooding-induced impacts on remaining oil distribution.Key evaluation indicators include geological factors such as reservoir rhythm,cementation index,porosity,permeability and dynamic produc-tion parameters.Through cluster analysis of 589 well datasets using an improved K-means algorithm,a graded eval-uation criterion was established.The plane distribution of preferential seepage channels is identified using an entropy-weighted TOPSIS algorithm,their development depth via time-variant numerical simulation and their development direction through reservoir multi-information inversion.Applying these findings to Oilfield Z and implementing chan-nel governance shows significant results with the recovery rate projected to reach 61.54%in 5 years and a cumula-tive oil increase of 158.5×104 t,greatly improving water-flooding efficiency.This research offers crucial scientific insights for long-term water-flooding reservoir development and enhancing water-flooding efficiency.关键词
块状砂岩油藏/优势渗流通道/分级评价标准/综合识别方法Key words
massive sandstone reservoirs/preferential seepage channels/graded evaluation criteria/comprehensive i-dentification methods分类
能源科技引用本文复制引用
伍丽娟,朱启星,吴文杰,楼一珊,杨笑..块状疏松砂岩油藏优势渗流通道综合评价方法[J].特种油气藏,2025,32(6):107-115,9.基金项目
海洋油气高效开发全国重点实验室开放基金课题"基于注水井堵塞机理的井筒附加阻力表征模型与预测方法研究"(CCL2023RCPS0168RQN) （CCL2023RCPS0168RQN）
