松辽盆地红岗北地区扶余油层储层单砂体分布模式

针对松辽盆地红岗北地区扶余油层岩性油藏储层单砂体分布特征认识不清和岩性圈闭预测困难等问题，利用8 口井的岩心资料、226 个岩心样品分析测试结果和386 口井的测井资料等，研究了储层单砂体成因类型、接触关系和分布模式。结果表明，扶余油层的储层单砂体类型主要为分流河道、水下分流河道和河口坝砂体。平面上，多支分流河道或水下分流河道砂体及其控制的河口坝砂体呈密集的窄带状分布特征；垂向上，储层单砂体分布受控于沉积物供给量与垂向沉积演化特征，呈现“南北分异”和“垂向分段”特征。平面多支、垂向多层的分流河道砂体的相互叠置，造成了研究区扶余油层储层砂体分布复杂多变的特征。扶余油层不同分流河道或水下分流河道砂体之间的接触关系可分为叠置式、切叠式、迁移式和孤立式等4 种类型。分流河道或水下分流河道砂体与溢岸薄层砂体或河口坝砂体之间多为突变接触关系；多期溢岸薄层砂体或河口坝砂体常呈“堆砌”叠置关系。以上认识可为红岗北地区扶余油层岩性圈闭预测和油水分布规律研究提供一定的依据。

Distribution patterns of single sand body in Fuyu oil layer in the northern Honggang area,Songliao Basin

The understanding of single sand body distribution is unclear and the prediction of lithologic prospects is difficult in Fuyu oil layer in the northern Honggang area, Songliao Basin. Using core data of 8 wells, analysis and test results of 226 core samples and logging data of 386 wells, this paper studied the genesis types, contact relationships and distribution patterns of single sand body in the northern Honggang area. The results show that the single sand body types of Fuyu oil layer are mainly distributary channel, subaqueous distributary channel and mouth bar sand bodies. In the plane, multi?branch distributary channel, subaqueous distributary channel and mouth bar sand bodies are distributed in a dense and narrow band. The vertical single sand body distribution is controlled by sediment supply and sedimentary evolution, and it shows the characteristics of“vertical subsection”and“differentiation between the north and the south”. The superimposed pattern of the distributary channel sand bodies is complex, which results in complex reservoir single sand body distribution in Fuyu oil layer. The contact relationship between different distributary channeland subaqeuous distributary channel sand bodies in Fuyu oil layer can be divided into four types, such as overlapping,stacking, migrating and isolated contact. The contact relationship between the distributary channel, subaqueous distributary channel sand bodies and thin sand bodies or the mouth barsand bodies is mainly an abrupt contact. Multi?phase thin sand bodies or mouth bar sand bodies are often in a“stacking”contact relationship. These results can provide an important basis for the prediction of lithologic traps and study on oil/water distribution rule of Fuyu oil layer in the northern Honggang area.