单轴载荷下岩石核磁共振特征的实验研究  

Experimental study of the NMR characteristics in rock under uniaxial load

作　　者：张元中[1] 肖立志[1] 

机构地区：[1]中国石油大学,北京102249

出　　处：《核电子学与探测技术》2006年第6期731-734,755,共5页Nuclear Electronics & Detection Technology

基　　金：国家自然科学基金(90510004);中国石油天然气集团公司重点基础研究项目(03A3032)资助

摘　　要：对岩石在单轴载荷下的核磁共振(NMR)特征进行了实验研究。选取两组砂岩和一组人工烧结陶瓷实验样品,在轴向施加压力作用改变岩石的孔隙结构,然后进行核磁共振谱测量,分析岩石在加压前后核磁共振谱和谱面积的变化特征。实验结果表明,由于外加载荷改变了岩石的孔隙结构,岩石的核磁共振谱产生明显的变化,其中横向弛豫时间T2谱面积是反映岩石孔隙结构变化的一个重要参数。The nuclear magnetic resonance （NMR） characteristics of the rock under uniaxial load were experimentally investigated. The experimental samples include two kinds of sandstone and one kind of the artificial sinter ceramics. The pore structure of the rock was changed under the axis stress, and NMR measurements were carried out. The characteristics of the NMR spectrum and NMR spectrum area under different load are analyzed. The experiment results show that the NMR spectrum of the rock changes obviously as the pore structure changed by applied uniaxial load; otherwise the NMR spectrum area of transverse relaxation time T2 is a basic parameter to reflect pore structure change of rock.

关 键 词：单轴载荷 岩石 核磁共振 实验研究 

分 类 号：P618.130.21[天文地球—矿床学]