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从常规物性特征及测井响应特征方面看,嘉二1亚段与嘉二2亚段具有类似的储层特征,都表现出了良好的储集性。嘉二段岩芯的核磁共振实验分析表明,嘉二1亚段与嘉二2亚段孔隙结构存在较大的差异。嘉二1亚段虽有较大的孔隙度,但孔隙空间主要被束缚流体所占据,利用岩芯的核磁共振实验资料可对储层的有效性进行评价。而由于嘉二2亚段孔隙空间主要被可动流体所占据,可采用喉道半径法来确定有效储层的下限值,以此为标准作为有效储层的判别依据。
Judging from the conventional physical characteristics and logging response characteristics, the Jia 2 1 sub-section and the Jia 2 sub-section have similar reservoir characteristics and all show good reservoir properties. Nuclear magnetic resonance analysis of cores in Jia second section shows that the pore structure of Jia 2 1 sub-section and Jia 2 sub-section 2 are quite different. Despite the large porosity of Jia 2 1 sub-zone, the pore space is mainly occupied by the bound fluid, and the validity of the reservoir can be evaluated by using the nuclear magnetic resonance experimental data of the core. As the pore space in sub-section 2 of Jia 2 is mainly occupied by movable fluid, the throat radius method can be used to determine the lower limit of effective reservoir, which can be taken as the criterion of effective reservoir.