CAJ | 학술논문

低渗透油藏石油探明储量逐年增加，低渗透油藏未动用储量占未动用总储量的比例较高，急需进行微观孔隙结构方面的研究工作。在长庆和大庆外围低渗透油区大量恒速压汞和核磁共振岩芯数据的基础上，分析了不同油区主流喉道半径、可动流体百分数与渗透率的关系及不同油区不同渗透率级别喉道半径和核磁共振T2弛豫时间图谱变化特征。研究表明：不同油区不同渗透率岩芯的喉道半径分布特征和核磁共振T2弛豫时间图谱的变化特征是不同的，可以用1.0μm的喉道半径所占的比例和核磁共振T2弛豫时间图谱的左峰和右峰相互关系作为储层水驱可动用渗透率的评价界限。在此基础上，探讨了长庆和大庆外围油区水驱开发渗透率的下限，为科学合理地开发特低渗透油藏提供了理论基础。
저삼투유장석유탐명저량축년증가，저삼투유장미동용저량점미동용총저량적비례교고，급수진행미관공극결구방면적연구공작。재장경화대경외위저삼투유구대량항속압홍화핵자공진암심수거적기출상，분석료불동유구주류후도반경、가동류체백분수여삼투솔적관계급불동유구불동삼투솔급별후도반경화핵자공진T2이예시간도보변화특정。연구표명：불동유구불동삼투솔암심적후도반경분포특정화핵자공진T2이예시간도보적변화특정시불동적，가이용1.0μm적후도반경소점적비례화핵자공진T2이예시간도보적좌봉화우봉상호관계작위저층수구가동용삼투솔적평개계한。재차기출상，탐토료장경화대경외위유구수구개발삼투솔적하한，위과학합리지개발특저삼투유장제공료이론기출。
Low permeability reserves occupied a very large proportion in our country’s proved and undeveloped reserves. So it is urgent to research the micro pore structure characteristics of low permeability reserves. Based on a large amount of experimental data by using constant-rate mercury penetration and nuclear magnetic resonance,the relationship between the mainstream throat radius,the percentage of mobile fluid and the permeability of different oilfields were analyzed,and the cores throat distribution and NMR T2 distribution with various permeability of different oilfields were studied. The results show that there were differences in the throat distribution and NMR T2 distribution of cores from different oilfields with various permeability,and the proportion of 1.0 μm throat and the relationship of T2 left peak and right peak can be the evaluation limit of water flooding producing. The lower permeability limit of water flooding development in Changqing Oilfield and Daqing Oilfield were studied,which laid a solid foundation for the development of low permeability reserves.