松辽盆地滨北地区白垩系泉头组—嫩江组沉积特征

滨北地区可识别出的3个超层序,研究层段属于热沉降坳陷期一级超层序的上部.在层序地层学研究的基础上,对松辽盆地滨北地区中浅层进行了详细的沉积相研究,大量录井、测井及岩心资料沉积学分析结果表明,中浅层发育冲积扇相、河流相、三角洲相及湖泊相等沉积相类型.详细分析了沉积相的平面展布特征.根据生储组合关系,指出滨北地区碎屑岩储集体成因类型包括曲流河河道、泛滥平原、三角洲以及滨浅湖滩坝等.其中三角洲前缘水下分流河道及河口坝砂体储集物性最好,其次为三角洲平原、滨浅湖滩坝砂体及河流相带.有利储层主要分布在黑鱼泡-乌裕尔凹陷、明水阶地西部及安达地区,这些储集体毗邻生油凹陷,具有优先捕集油气的条件.

Depositional characteristics of Quantou Formation-Nenjiang Formation in Binbei area,Songliao Basin

Three super sequences can be distinguished from Binbei area.The strata researched belong to the upper part of the super sequence I during the thermal subsidence era.Based on the study on sequence stratigraphy,detailed analysis has been done on the middle-shallow strata in Binbei area,Songliao Basin.According to large number of data from cores and logging,and with the application of sedimentology,it can be found that some types of sedimentary facies developed in the medium to shallow layers include fan delta facies,braided stream facies,meandering stream facies,lacustrine facies,etc.The areal distribution of sedimentary facies is also discussed.According to the source-accumulation assemblage,it can be concluded that the favorable reservoir facies are meandering stream,floodplain,delta,etc.Among them,the under water distributary channel in the frontal edge of the delta possesses the best physical property,and then the delta plain,stream,dam sandbody and fluvial facies belt.Heiyupao-Wuyuer depression,western Mingshui terrace and Anda area are favorable reservoirs.These reservoirs are adjacent to source rocks depression and have the superiority to trap hydrocarbons.