鄂尔多斯盆地长7致密油储层储集空间特征及其意义

Characteristics of Chang7 tight oil reservoir space in Ordos basin and its significance

通过对长7致密油储层的核磁共振测试,研究鄂尔多斯盆地长7致密油储层储集空间特征。结果表明:鄂尔多斯盆地长7致密油储层孔隙孔径分布范围宽,储层中大孔、中孔、小孔、微孔及纳米孔孔隙类型均发育,且孔径分布范围、孔隙类型和主体孔隙类型受储层致密程度的控制作用明显;长7致密油储层大孔至纳米孔孔隙均含油,且微孔至纳米孔孔隙含油饱满。长7致密油储层微孔、纳米孔孔隙类型的识别及其含油的认识对鄂尔多斯盆地非常规油气资源的勘探与开发具有一定的启示意义。

The Chang7 tight oil reservoir in Ordos basin was tested by nuclear magnetic resonance （NMR）. The results show that the pore size distribution of Chang7 tight oil reservoir is extremely wide, with big size pores, intermediate size pores, small pores, micro-pores and nano-pores all existed. The parameters, such as pore size, pore composition, principal pore type, are closely related to compactness of the reservoir. Almost all pores, from big size to nanometer size in tight oil reservoir contains oil, and the oil saturation in micro-pores and nano-pores are acceptably high. The identification of pore types in tight oil reservoir, especially micro-pores and nano-pores, and cognition of oil saturation in these pores have great significance to the exploration and development of tight oil resources in Ordos basin.