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Velocity distribution of slow fluid flows in Bentheimer sandstone: an NMRI and propagator study.

Abstract：

:This work addresses the special problems of measuring flow velocity distributions in rock by NMR methods. Specifically, these problems are to measure very slow flows as well as flows in the presence of background magnetic field gradients caused by heterogeneities of the rock. We modify a stimulated echo sequence for use in diffusion measurements, in order to maximize velocity sensitivity and minimize background gradient effects. Accurate velocity images of Soltrol 220 oil in sandstone were made for flow velocities up to around 0.04 mm/s with an imager that does not have echo-planar capability. Accurate velocity distributions by the propagator method can be obtained even with stimulated echo delays of 1.9 T1 by phase cycling combined with suitable crusher gradients.

journal_name

Magn Reson Imaging

journal_title

Magnetic resonance imaging

authors

Waggoner RA,Fukushima E

doi

10.1016/s0730-725x(96)00110-5

subject

Has Abstract

pub_date

1996-01-01 00:00:00

pages

1085-91

issue

9

eissn

0730-725X

issn

1873-5894

pii

S0730-725X(96)00110-5

journal_volume

14

pub_type

杂志文章

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