石油地质与工程2026，Vol.40Issue(5)：27-34,8.DOI:10.26976/j.cnki.sydz.202605005
断层对河流相砂体分布的控制作用研究
Study on the control effect of faults on fluvial sand body distribution:a case study of the Guantao Formation in Nanpu Oilfield,Bohai Bay Basin
摘要
Abstract
The relationship between fault activities and fluvial-facies sand-body distribution in the Guantao Formation of the Nanpu Oilfield,Bohai Bay Basin remains ambiguous,which restricts fine reservoir prediction and favorable-zone optimization.Based on core observations,logging-response analyses and 3D seismic attribute interpretation,this study identifies that the study area is dominated by a braided-river depositional system comprising sedimentary microfacies such as mid-channel bars,braided channels and floodplains.The results indicate that fault activity and its spatial variations control paleotopographic relief and depositional-system development.Segments with weak fault activity allow river channels to pass through and form continuous sand bodies.In contrast,intensely active segments generate sedimentary depressions via differential subsidence,facilitating rapid sand-body accumulation and thickness increase.The downthrown blocks of north-dipping faults and slope-break zones of south-dipping faults constitute favorable sites for sand-body enrichment.Faults control reservoir boundaries not only through structural baffles and lithologic facies changes but also determine reservoir scale and distribution patterns by modulating sand-body stacking architectures.Type Ⅰ faults primarily govern deep-layer hydrocarbon migration,whereas Type Ⅲ faults dominate the redistribution and enrichment of shallow-layer hydrocarbon reservoirs.A response-relationship model between fault activity and sand-body distribution is established,providing technical support for fine prediction and development of complex fault-block reservoirs.关键词
渤海湾盆地/南堡油田/新近系/河流相Key words
Bohai Bay Basin/Nanpu Oilfield/Neogene/fluvial facies分类
天文与地球科学引用本文复制引用
于忠良,高贺存,崔建,王冬娜,刘奕辰,徐清岩..断层对河流相砂体分布的控制作用研究[J].石油地质与工程,2026,40(5):27-34,8.基金项目
国家自然科学基金"盆缘过渡带坡度-流量双重控制下的辫状河成因机制与砂体构型模式"(42472205) （42472205）
"陆相混合沉积不同岩性组合的差异成岩演化与孔隙发育机理"(42172154)联合资助. （42172154）
