致密砂岩储层核磁共振T_2谱分析研究  

The T_2 spectrum analysis of tight sandstone reservoir

作　　者：张晓[1] 

机构地区：[1]西安石油大学,陕西西安710065

出　　处：《石油化工应用》2017年第2期85-88,共4页Petrochemical Industry Application

摘　　要：为了分析岩石孔隙中流体分布,使用核磁共振(NMR)仪器对致密砂岩储层不同井位岩心进行了测量,得到T_2谱分布。核磁共振(NMR)T_2谱可较为直观的反映岩石孔隙中流体分布。实验结果表明,样品T_2截止值较小,并且其T_2谱分布主要为双峰,横坐标表示横向弛豫时间,横向弛豫时间对应孔隙的大小,1 ms^10 ms对应小孔隙,10 ms^100 ms对应的中等孔隙,100 ms以上对应大孔隙。小孔隙中的流体由于毛管力作用导致流体不可流动,也就是所谓的束缚流体,而大中孔隙中流体可以在驱动力作用下流动也就是常说的可动流体。In order to analyze the fluid distribution in rock pores, using Nuclear Magnetic Resonance（NMR） instrument to measure different cores of the tight sandstone reservoir to get T2 spectrum distribution. The T2 spectrum can reflect the fluid distribution in rock pores more directly. The experimental results show that the T2 cutoff value is smaller and its T2 spectrum distribution mainly in double peak and the horizontal coordinate represents the abscissa transverse relaxation time. Transverse relaxation time corresponding pores size, 1 ms10 ms corresponding small pores, 10 ms 100 ms corresponding medium pores, more than100 ms corresponding large pores. Irreducible fluid means that can’t flow because of capillary pressure,movable fluid means that fluid can flow because of the driving force.

关 键 词：T2谱 可动流体分布 可动流体饱和度 

分 类 号：P631.81[天文地球—地质矿产勘探]