石油实验地质2025，Vol.47Issue(5)：1017-1034,18.DOI:10.11781/sysydz2025051017
塔河油田奥陶系古暗河充填特征与储层发育模式
Filling characteristics and reservoir development models of Ordovician ancient underground rivers in Tahe Oil Field
摘要
Abstract
As a key research subject in karst systems,ancient underground rivers exhibit complex spatial struc-tures and diverse filling patterns,posing significant geological challenges to the development of fracture and cavity reservoirs.Conventional seismic interpretation methods are no longer sufficient to support the research needs for these reservoirs.The unclear understanding of the spatial structure and reservoir models of these ancient under-ground rivers has severely limited the effective development of fracture and cavity reservoirs and well deployment in the Tahe area.Based on drilling data,well logging,conventional seismic interpretation,acoustic impedance inversion,shale content inversion,and production performance data,the study reconstructed the paleogeomor-phology as well as the water and fault systems that controlled the development of underground rivers.It further analyzed the filling characteristics and patterns of ancient underground rivers under different geomorphic settings.Additionally,by integrating data of wells intersecting underground rivers,the study explored the genesis of reser-voirs in sinkholes,corridors,and channel expansion areas,and established reservoir development models under various geomorphic contexts.The results indicated that:(1)In regions of relatively high topography(e.g.,high-lands and gentle slopes)and in steep-slope recharge zones,large-scale caves filled with stacked breccias and sandstone are developed in sinkholes,whereas in steep-slope drainage zones,large-scale caves are predominantly filled with mudstone and breccia composites.(2)Along the geomorphic transition from highlands to steep slopes,reservoir types shift from fractured surrounding rocks to caves filled with sandstone or siltstone at geomorphic turning points,and eventually evolve into small caves filled with horizontal pores,fractures,and siltstone.(3)In the straight reaches of ancient underground rivers,reservoir development exhibits zonal differentiation:shallow recharge and drainage zones in highlands have poor reservoir physical properties,while deeper recharge and run-off zones demonstrate better properties.(4)At junctions and expansion zones of underground rivers,multi-phase collapse-filled or unfilled caves are mostly developed and exhibit favorable reservoir properties.In contrast,caves in corridors are typically filled with mudstone or mudstone-cemented breccia,resulting in poor reservoir quality.关键词
古暗河/充填特征/储层模式/奥陶系/塔河油田Key words
ancient underground river/filling characteristics/reservoir model/Ordovician/Tahe Oil Field分类
能源科技引用本文复制引用
张宸赫,杨柳鑫,邹千禧,刘尽贤,高志前,吕慧,田建华,樊太亮,杨德彬,吴俊,卫端,杨杰..塔河油田奥陶系古暗河充填特征与储层发育模式[J].石油实验地质,2025,47(5):1017-1034,18.基金项目
国家科技重大专项"不同缝洞储集体地震识别与预测技术"(2016ZX05014-001)资助. （2016ZX05014-001）
