火成岩储层核磁共振岩石物理影响特征  

Characteristics of petrophysical impact on the nuclear magnetic resonance in igneous reservoir

作　　者：屈乐[1,2] 孙卫[1] 章海宁 杜环虹 

机构地区：[1]西北大学地质学系大陆动力学国家重点实验室,西安710069 [2]中国石油测井有限公司,西安710077

出　　处：《兰州大学学报（自然科学版）》2014年第1期26-30,共5页Journal of Lanzhou University(Natural Sciences)

基　　金：国家科技支撑计划项目(2007BAB17B00);中国石油天然气集团公司"十二五"测井前沿技术与应用基础研究项目(2011A-3902)

摘　　要：为研究火成岩储层中顺磁性物质对核磁共振测量结果的影响,分别选取7块含有顺磁性物质的人造岩心和60块实际火成岩岩心进行核磁共振实验研究,分析顺磁性物质质量分数以及不同回波间隔对核磁孔隙度测量结果的影响.研究表明:顺磁性物质会极大地减小核磁共振孔隙流体的横向弛豫时间T2,造成测量的孔隙度减小,而且不同岩性的火成岩样品,由于顺磁性物质质量分数不同,核磁孔隙度误差也不同,当顺磁性物质质量分数超过6%时,核磁孔隙度基本为零.In order to investigate into the impact of paramagnets on the result of nuclear magnetic resonance in igneous reservoirs, 7 artificial cores with paramagnets and 60 actual igneous cores had been chosen for nuclear magnetic resonance measurements. The effects of nuclear magnetic resonance consequence by means of the contents of paramagnets and different TE were analyzed. The research illustrated that paramagnets could reduce the T2 of fluids in nuclear magnetic resonance measurement, thus causing the NMR porosity to be lower. Furthermore, the deviation of porosity was distinct because of the different contents in different lithologic igneous rocks. And when the content of paramagnets surpassed 6%, the porosity was nearly 0.

关 键 词：火成岩 核磁共振 顺磁性物质 人造岩心 孔隙度 

分 类 号：P589.1[天文地球—岩石学]