松辽盆地三肇凹陷向斜区白垩系姚家组葡萄花油层油水分布特征及其主控因素

松辽盆地三肇凹陷向斜区具有数量可观的油气资源，但葡萄花油层的油水分布十分复杂，其主控因素尚不清楚。利用成熟开发区详实的静态资料和开发动态资料，研究了已发现的油藏类型和分布特征，分析了石油成藏的控制因素，并探讨了富油凹陷向斜区油水分布的主控因素。结果表明： 1）三肇凹陷向斜区葡萄花油层的油水分布受控于由局部构造和单砂体组成的单一圈闭，在单一圈闭内具有统一的油水界面，相邻的不同单一圈闭具有不同的油水分布规律； 2）单一圈闭的聚油模式及其叠加样式控制了向斜区的油气成藏与油水分布，已成藏的单一圈闭和未成藏的单一圈闭在空间上的复杂叠置最终造成了向斜区石油聚集与分布的复杂性； 3）垂向多层、平面多支的单砂体和复杂的局部构造组合形成的圈闭以及非圈闭的叠置关系是向斜区油水分布特征的主控因素。由此可见，向斜区的油藏预测需从控制油气成藏的不规则空间体的构成要素出发，即分析断裂、单砂体及二者空间配置关系。

Oil-water distribution and its major controlling factors of Putaohua reservoir of the Cretaceous Yaojia Formation in syncline area of Sanzhao Sag,Songliao Basin

The volume of oil and gas in the syncline area of Sanzhao Sag,Songliao Basin,is sizable.It’s hard,however,to make clear the complicated oil-water distribution in Putaohua reservoir,and so far its controlling factors are rarely known.Reservoir types discovered and their distribution patterns were investigated,controlling factors of hydrocarbon accumulation were analyzed,and the main controlling factors of oil-water distribution in the syncline area of the prolific sag were discussed,by using the abundant static data and performance data of the mature development blocks of the oilfield.The results show that (1) oil-water distribution of Putaohua reservoir in the syncline area is controlled by a single trap composed of local structure and single sand body,the oil-water interface of a single trap is unified,but the oil-water distribution patterns vary for different single traps adjacent. (2) In a single trap, the oil-water distribution in the syncline area is controlled by the patterns of hydrocarbon accumulation and superimposition:complex spatial superimposition of single traps with and without hydrocarbons ultimately results in the complexity of hydrocarbon accumulation and oil-water distribution in the syncline area,Sanzhao Sag. (3) The superimposition of traps that are composed of vertically multi-layered and laterally multi-branched single sand bodies and complicated local structures with non-traps is the main controlling factor of oil-water distribution in the syncline area.Therefore, reservoir prediction in the syncline area should begin with the analysis of elements of irregular geologic body controlling hydrocarbon accumulation,that is,the evaluation of faults,single sand bodies and their spatial assemblage.