摘要
玛湖凹陷北斜坡百口泉组油藏开发过程中油水分布规律复杂,开发过程中开发层系划分和储层砂体对比存在诸多矛盾。以岩心、测井、地震资料为基础,以层序地层学理论为指导,结合地震剖面反射特征开展三叠系百口泉组层序地层划分和对比,并建立统一层序地层格架,为油藏开发层系划分和储层砂体对比提供依据。玛北地区百口泉组划分为1个长期基准面旋回,呈现为基准面上升及湖侵的特征;可进一步细分为MSC1、MSC2、MSC3等3个中期旋回,其中MSC2旋回厚度最大,为最有利含油层段,垂向上多层含油,T_1b_2~2、T_1b_2~1为主力油层。玛北地区百口泉组层序发育与演化明显受控于构造作用,自盆地边缘向盆地方向存在外坡折、中坡折和内坡折三个坡折带。通过建立统一的三叠系百口泉组层序地层格架为油藏开发层系划分和储层砂体对比提供依据,指导剩余油挖潜和加密井部署。
The oil-water distribution of the Baikouquan Formation reservoirs in the northern slope of the Mahu Sag is complex.There are many differences between development layer division and correlation of reservoir sand bodies.Guided by the theory of sequence stratigraphy,the sequence stratigraphy of the Baikouquan Formation in Triassic was divided and correlated combined with reflection characters of seismic profile based on core,well logging and seismic data.Unified sequence stratigraphic framework was made,which provides basis for development layer division and correlation of reservoir sand bodies.In Mabei area,Baikouquan Formation was divided into one long-term base-level cycle with the characteristics of base-level rising and lake transgression.It can be divided into MSC1,MSC2 and MSC3 three medium-term cycles.Among them,MSC2 cycle with the largest thickness is the most favorable oil-bearing interval,and many vertical layers are oil-bearing with the main pays of T1 b22 and T1 b21.The sequence development and evolution of the Baikouquan Formation was controlled by tectonic action in Mabei area.From the edge of the basin to the basin,there were outer,middle and inner three slope break belts.The unified Triassic Baikouquan Formation sequence stratigraphic framework provides a basis for the development layer division and correlation of reservoir sand bodies,and guides tapping the potential of remaining oil and infill well deployment.
引文
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