【摘要】 四川盆地中部地区侏罗系凉高山组滩坝相砂岩是致密油重要产层。生产数据表明,该储层非均质性强,亟需明确有利储层类型及其分布的主控因素。针对凉高山组湖相三角洲—滩坝沉积体系,利用岩心、露头、录/测井、岩石薄片、地球化学和古地貌等资料,应用湖侵—湖退体系域划分方法及沉积微相精细划分技术,识别不同级次的层序,精细剖析层序演化过程及其控制下的储层的成因类型和有利储层分布。提出凉高山组沉积时期湖平面的升降控制了滩坝的形成与发育,滩坝主要分布于湖侵体系域。并将滨浅湖滩坝进一步划分为坝(坝主体、坝侧缘)、滩(近岸滩和远岸滩)2个微相,认为凉高山组有利储层受沉积微相控制,浅湖砂坝主体砂岩为有利储层。最后初步优选2个致密油勘探有利区,明确了滩坝相有利储层分布规律,对下步勘探决策有指导意义。更多还原

【Abstract】 Lianggaoshan Formation is the main target tight oil layer. Lianggaoshan Formation deposited a set of delta-beach bar sedimentary system,and the beach-bar reservoir had strong heterogeneity. The purpose of this paper was to reveal the controlling factors on favorable facies and their distribution of tight oil reservoirs in the sequence stratigraphic structures. Detailed information has been acquired through analyses of cores,outcrops,well logs,thin sections of rocks,geochemical data,and geomorphological data. Conclusions are listed as follows. Firstly,the research indicates the distribution of sand beach bar is controlled by both lake-level changes and provenance,and beach-bars concentrate in the middle transgressive systems tract and early regressive systems tract. Secondly,shore-shallow lacustrine sand beach bar is refined into main body,margin,in-shore beach,and off-shore beach. Thirdly,based on the characteristics analyses of reservoir in different micro-facies,the distribution of favorable reservoir is controlled by micro-facies. The favorable reservoir is the main body of bar. Fourthly,the favorable reservoirs are finally zoned. The research work has defined the distribution of favorable reservoir in tight oil reservoirs,which is of guiding significance for the next exploration.更多还原