葡南油田葡萄花油层油藏类型及油水分布规律

Oil-water Distribution Law and Reservoir Type in Putaohua Reservoir of Punan Oilfield

葡南油田葡萄花油层为松辽盆地中浅层重要的增储潜力区之一,受构造样式多、断层分割强和沉积相变快等因素影响,油藏类型多样及油水分布复杂。本文利用测井、录井和生产动态等资料,对葡南油田葡萄花油层进行单一圈闭划分及油藏动静一体化精细解剖。研究结果表明:葡南油田葡萄花油层主要发育岩性、断层-岩性和构造3种类型油气藏。受背斜构造北西高南东低、东西向断层分割和储层砂体连通性顺源变差等因素影响,岩性油藏发育在砂地比值低的背斜构造边缘区;断层-岩性油藏发育在断层发育和砂地比值中等的背斜构造斜坡区;构造油气藏发育在砂地比值高的背斜构造主体区。岩性油气藏储层表现为"非干即油"的特征,油主要发育在孔隙度大于18%的高物性水下分流河道和主体席状砂中;断层-岩性油气藏平面上主要分布于反向断层下盘,受断层侧向封挡和水下分流河道优势输导共同控制垂向上主要聚集在低水位期的葡Ⅰ4-葡Ⅰ9小层;构造油藏主要分布于背斜构造高点,整体上表现为上油下水特征,油气分布不受微相类型和储层物性控制。

Putaohua reservoir in Punan oilfield is one of the most important potential areas in the middle and shallow strata of Songliao Basin.Structural types,fault desperation,and rapid sedimentary phase transition have a strong influence on the diverse reservoir types and the distribution of oil-water.In this paper,the logging,mud logging and dynamic production data were used to analyze a single trap division and fine anatomy of the dynamic and static integration of the Putaohua reservoir in Punan oilfield.The results show that,three types of oil and gas reservoirs are mainly developed in Putaohua reservoir in Punan oilfield,including lithologic,fault-lithologic and structural reservoir.Owing to the anticline structure which plunges southward,east-west fault desperation and low sand body connectivity along source area direction,lithologic reservoir developed in the boundary of anticline structure which has a low sand-stratum ratio;The fault-lithologic reservoir developed in fault development and middle sand-stratum ratio area which is located on the slope area;The structural reservoir developed in the sand-stratum ratio area which is located on the main part of the anticline.Lithologic reservoir was characterized by the dry or oil-bearing reservoir,oil mainly distributes in underwater distributary channel and sheet sand with high physical properties that porosity exceeds 18%;The fault-lithologic reservoir located on the footwall of antithetic faults mainly distributes on Pu I4-Pu I9 small layers which developed during the low-level period and controlled by fault seal and underwater distributary channel;The structural reservoir main distributes on the high part of the anticline,which characterizes upper oil and lower water.Oil distribution is not controlled by sedimentary micro-facies and physical properties of the reservoir.