高孔低渗碳酸盐岩可动流体T_2截止值实验研究

Experimental study on T_2 cutoff value of the movable fluid in high-porosity low-permeability carbonate rock

利用核磁共振岩样分析技术确定高孔低渗碳酸岩可动流体T2截止值.结合离心实验,确定高孔低渗碳酸岩标定T2截止值的最佳离心力为2.76 MPa,此离心力同时也是对应储层可动用流体离心力的下限值,在该离心力下,对22块具有代表性的高孔低渗碳酸岩岩心进行离心,获得高孔低渗碳酸岩岩心的T2截止值为63.6 ms.利用此批岩心的T2截止值与孔隙度、渗透率进行对比,发现T2截止值与孔隙度没有相关性,与渗透率的相关性较低.

T2 cutoff value of the movable fluid in the carbonate rock of high porosity and low permeability was determined by NMR rock sample analysis technique.The best centrifugal force for determining T2 cutoff value of the movable fluid by centrifugal experiment is 2.76 MPa,which is also the lower limit value of reservoir fluid flowing.Under the centrifugal force,T2 cutoff values of 22 typical high-porosity low-permeability carbonate samples are calibrated,and their mean value is 63.6 ms.The relationships between T2 cutoff values and the porosity and permeability are studied,and it is shown that there is no correlation between T2 cutoff value and the porosity,and there is low correlation between T2 cutoff value and the permeability.