松辽盆地民东地区差异成藏及主控因素

Analysis on different reservoir and controlling factors of Mindong area,Songliao basin

民东地区是吉林油田低渗油藏效益储量提交的重点区块,成藏条件、成藏过程和成藏特征认识不充分。以新民油田350口开发井、民东地区82口探井、评价井和长春岭气田30口探井资料为基础,根据成藏条件评价和成藏过程解剖,揭示民东地区的油气差异成藏特征和主控因素,并进行现场实践。结果表明:新民、民东和长春岭地区油气来源具有差异性,造成沿江一带差异成藏;研究区成藏经历"沿源断裂垂向倒灌—沿断砂输导体侧向长距离运移—沿断裂垂向运移—构造脊圈闭聚集"的过程。断裂控制油气的运聚、成藏及分布,圈闭条件不足是造成油气过路的主因,它们与供烃条件共同耦合,造成新民、民东、长春岭地区在含油气程度上的差异。复查T29、T24老井试油及3处剩余出油点,对完善民东地区及沿江一带的成藏规律具有指导意义。

Mingdong area is an important preparation block of tight oil reserves for Jilin oilfield,but a breakthrough has not been achieved ever,the main reason for that is no scientific and reasonable understanding of reservoir formation along the Songhua river.With the productivity and test data of 350 wells in Xinmin,70 wells in Mindong and 30 wells in Changchunling,combined with a large number of contiguous 3Dstructure interpretation,fault analysis and typical reservoir understanding,in-depth study on factors of reservoir rules has been studied,and the characteristics and causes of reservoir differences in this 3areas have been revealed to guide the production.Study shows that there are differences in oil and gas sources between Xinmin,Mindong and Changchunling,which is the basis for reservoir formation in the area.The accumulation of reservoirs in the study area is characterized by process that 'vertical intrusion along source faults-distance migration-vertical migration along the fault-ridge trap closure structure'.The faults control the migration,accumulation,distribution of oil and gas.The lack of traps is the main cause of oil crossing.Coupled with the hydrocarbon supply conditions,they result in the difference of oil and gas degree between Xinmin,Mindong and Changchunling.The T29,T24 and 3remaining oil points are reexamined,which is of great significance to perfect the reservoir forming rule along the Songhua river.