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松辽盆地南部扶新隆起的形成时间、演化特征和油气充注时间认识不清,一直没有公认的统一结论.文中对扶新隆起扶余油层岩性地层油气藏自生伊利石K-Ar同位素年龄进行了研究.在伊利石矿物分离提纯、X衍射分析和扫描电镜检测的基础上,进行了同位素测试和年龄的计算分析.在松辽南部“六史”演化综合分析的基础上,剖析了松辽南部扶新隆起的构造-沉积-成藏演化特征,认为盆地南部整个中央坳陷区油气演化和成藏的地质背景相似,其中的长岭凹陷和扶新隆起是在青一段烃源岩进入生烃高峰后和扶余油层主成藏期后才发生明显的“隆-凹”分异,即油气成藏发生于扶新隆起大规模隆升之前.油藏具有上生下储、本地供源、垂向运移的特征,澄清了以往油源主要来自长岭凹陷侧向运移的地质认识.根据自生伊利石同位素年龄,结合流体包裹体方法,确定了扶新隆起扶余油层岩性地层油气藏油气充注的完整历史过程.这一认识有助于正确评价扶新隆起和长岭凹陷及外围地区的资源潜力和勘探方向.研究表明自生伊利石K-Ar同位素测年和流体包裹体两种技术方法的结合是追溯油气充注历史、确定油藏年龄的行之有效的方法手段.
The forming time, evolution characteristics and filling time of Fusui uplift in southern Songliao Basin have not been well recognized and there is no universally accepted conclusion. The K-Ar isotopic age of the authigenic illite in the lithologically stratigraphic reservoirs of Fuxin uplift in the Fuxin uplift Based on the analysis of illite mineral separation, X-ray diffraction and scanning electron microscopy, the isotope test and age calculation were carried out.On the basis of the comprehensive analysis of the evolution of the “Six Records” in southern Songliao, The structural-sedimentary-reservoir-forming characteristics of the Fuxin uplift in southern Songliao suggest that the geological background of hydrocarbon evolution and accumulation in the central central depression of the basin is similar. The Changling sag and the Fuxin uplift, After the peak of hydrocarbon generation and the main accumulation period of Fuyu oil layer, obvious “Long-concave” differentiation occurred, that is, the hydrocarbon accumulation took place before the massive uplift of Fuxin uplift, The characteristics of local source and vertical migration, and clarified the geological understanding that the oil source mainly came from the lateral migration of Changling sag in the past.According to the isotopic ages of self-generated illite and the method of fluid inclusions, The complete historical process of oil and gas filling in the lithostratigraphic reservoirs in the reservoir can help to correctly evaluate the resource potential and exploration direction of the Fuxin uplift and the Changling sag and its peripheral areas.The study shows that the K-Ar dating of the authigenic illite The combination of two technical methods with fluid inclusions is an effective way to trace the history of oil and gas filling and determine the reservoir age.