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辽河油田边顶水超稠油油藏具有构造平缓、岩石颗粒粗、物性好、成岩作用弱、非均质性较弱、油水关系复杂的特征。通过对该类油藏的成因探讨,认为生物降解作用是形成边顶水超稠油油藏的物质基础;水动力和水洗作用使浮力对原油运动力的影响变得极小;氧化作用形成的“沥青壳”阻止了地层水的下渗,有利于油藏的保存。
The top-water super heavy oil reservoir in Liaohe Oilfield has the characteristics of gentle structure, coarse rock particles, good physical properties, weak diagenesis, weak heterogeneity and complicated oil-water relations. By discussing the genesis of this type of reservoirs, it is considered that the biodegradation is the material basis for the formation of ultra-heavy oil reservoirs on the side of the top water; the influence of buoyancy on the motive force of crude oil becomes extremely small due to hydrodynamic and water washing; “Asphalt shell ” to prevent the infiltration of formation water, is conducive to the preservation of the reservoir.