松辽盆地火山岩核磁共振实验研究及应用

Experimental study and application of NMR in volcanic rocks of Songliao Basin

在松辽盆地火山岩中选取全直径岩样利用饱和水多次离心法进行火山岩岩心核磁共振实验分析,解决了核磁共振测井方法的关键参数T2截止值的确定问题,打破了认为火山岩T2截止值为同一T2截止值(90ms)的传统认识。把实验结果同其它实验方法获得的结果进行横向对比分析发现,利用新的T2截止值可以准确计算可动流体孔隙度、束缚水孔隙度等参数,并确定了T2图谱的分布与岩心孔隙结构之间的关系。将实验成果应用到核磁共振测井在单井储层评价中取得了良好的成果。

Using whole diameter volcanic cores, which were saturated by water after repeatedly centrifugation, the nu- clear magnetic resonance （NMR） experiments were carried out to determine the key parameter - T2 cut - off value of NMR well logging method. The traditional understanding that the volcanic T2 cut - off value is the same one for 90ms was broken out by the new value. By comparing with other experimental results, it is found that the new value can be used to calculate accurately the porosities of movable fluid and bound water and determinate the relationship between the distribution of core T2 map and pore structure. The experimental results were applied in NMR logging for reservoir evaluation of single well and good results were obtained.