中国石油大学学报（自然科学版）2015，Vol.39Issue(6)：92-98,7.DOI:10.3969/j.issn.1673-5005.2015.06.012
核磁共振研究致密砂岩孔隙结构的方法及应用
Characterization of pore structure of low permeability reservoirs using a nuclear magnetic resonance method
摘要
Abstract
The flow conductivity of low permeability reservoirs is constrained by their pore structures. Nuclear magnetic reso-nance( NMR) T2 spectra and mercury intrusion methods can be used to characterize the pore structures of different rocks. In this study, the correlations of NMR T2 relaxation time with pore throat radius ( in terms of pore-throat ratio) for fully water-bearing rocks were studied in combination with the mercury intrusion technique,in which the NMR T2 distribution can be con-verted into a pore throat radius distribution using a method of interpolation and multiple regression. The pore structure, mova-ble fluid distribution, movable oil distribution and the minimum movable fluid pore radius of a tight sand-rock from Ordos Ba-sin were investigated using the inverted pore throat distribution curve. The results show that the complicated pore structure of the tight sand-rock studied is characterized by micro pores and nano-submicron pores with average pore throat radius in the range of 0. 095-1. 263 microns, and the fluid is mainly bounded in the pores of 0. 001-0. 01 microns. The movable fluid is mainly distributed in the pores with radius larger than 0. 01 microns, and the movable oil that can be displaced by water is mostly in the pores larger than 0. 1 microns. The average cutoff value of the pore radius for movable fluid is characterized as 0. 013 microns.关键词
低渗油藏/核磁共振/高压压汞/孔隙结构/可动流体Key words
low permeability reservoir/nuclear magnetic resonance ( NMR )/high pressure Hg injection/pore structure/movable fluid分类
能源科技引用本文复制引用
李爱芬,任晓霞,王桂娟,王永政,江凯亮..核磁共振研究致密砂岩孔隙结构的方法及应用[J].中国石油大学学报（自然科学版）,2015,39(6):92-98,7.基金项目
国家科技重大专项(2011ZX05044) （2011ZX05044）
高等学校学科创新引智计划(B08028) （B08028）
长江学者和创新团队发展计划(IRT1294) （IRT1294）
国家自然科学基金青年项目(51304232) （51304232）
