大庆长垣扶余油层成藏特征及勘探潜力

ACCUMULATION CHARACTERISTICS AND EXPLORATION POTENTIALS FOR FUYU OIL LAYERS IN DAQIGN PLACANTICLINE

大庆长垣位于松辽盆地北部中央坳陷区,其资源潜力大,扶余油层是下步重点勘探层位.依据烃源岩、运移通道和圈闭以及相互匹配关系,对扶余油层油藏进行精细评价.研究认为：长垣扶余油层三级构造对油气运聚具有诱导作用,北西向断裂带控制油气富集,河道砂体是油气富集的最有利储层,油气富集受油源、构造、断裂、河道砂体等要素的匹配关系控制;青一段油气通过输导断层下排至扶余油层,在势能和压力差的作用下,通过北西向张性断裂与河道砂体组成的复合输导系统进行侧向运移,并在侧向运移过程中遇到油气圈闭聚集成藏;依据各油气圈闭的富集程度,将长垣扶余油层划分为4类勘探潜力区块。

Daqing Placanticline is located in the Central Depression of North Songliao Basin,which is characterized by the considerable potential in petroleum resources,Fuyu oil layers are the next key strata to explore.Based on the source rocks,migration pathways,traps and their matching relationships,the fine oil reservoir appraisal is carried out.The researches show that the third-order structures induce the hydrocarbon migration and accumulation,NW fault belts controls the enrichment of the hydrocarbon,the fluvial channel sandbodies are the most favorite reservoir rocks and the hydrocarbon enrichment is dominated by the matching relationship among the oil sources,tectonics,fractures,fluvial channel sandbodies,etc.; Member Qing-1 hydrocarbon transports downward along the faults to Fuyu oil layers.Acted by the potential energy and pressure difference,the lateral migration occurs through the complex transporting system combined with NW extensional fractures and fluvial channel sandbodies,and at the same time,in the process of the above migration,the hydrocarbon accumulates whenever meeting with the traps; according to the enriched degrees of each hydrocarbon trap,Fuyu oil layers within Daqing Placanticline can be divided into four exploration potential tracts.