中国石油大学学报（自然科学版）2017，Vol.41Issue(1)：60-68,9.DOI:10.3969/j.issn.1673-5005.2017.01.007
一种估算砂岩核磁T2谱新方法
A new method of estimating NMR T2 spectrum of sandstone
摘要
Abstract
Based on nuclear magnetic resonance (NMR)relaxation mechanism and three-dimensional digital core technology,a new method of estimating the spectrum of sandstone transverse relaxation time (T2) is established.A process-based method was used to reconstruct 3D digital rock models of sandstone.Sandstone microstructures were divided into tetrahedral pore units using Delaunay tessellation.Considering the geometry and using a Monte Carlo approach,the surface-to-volume ratio (S/V) of each pore unit was calculated,and then the T2 spectrum of sandstone could be simulated.After a large number of simulations,suitable parameters were selected in order to reduce calculation errors.Unimodal and bimodal T2 spectrum were considered;both results agreed well with laboratory tests.This new method is helpful in studies of different NMR response effects with varying grain sizes or pore structures.关键词
核磁T2谱/数字岩心/过程模拟法/Delaunay剖分/Monte Carlo方法Key words
NMR T2 spectrum/digital core/process-based method/Delaunay tessellation/Monte Carlo method分类
天文与地球科学引用本文复制引用
闫伟超,孙建孟,崔利凯,闫国亮..一种估算砂岩核磁T2谱新方法[J].中国石油大学学报（自然科学版）,2017,41(1):60-68,9.基金项目
国家自然科学基金项目(41374124,41574122) （41374124,41574122）
国家科技重大专项(2011ZX05014-004-002H) （2011ZX05014-004-002H）
