Dilution tests in a low-permeability fractured aquifer: Matrix diffusion effect

Anat Bernstein; Eilon Adar; Alexander Yakirevich; Ronit Nativ

doi:10.1111/j.1745-6584.2006.00268.x

Dilution tests in a low-permeability fractured aquifer: Matrix diffusion effect

Anat Bernstein, Eilon Adar, Alexander Yakirevich, Ronit Nativ

Department of Earth and Environmental sciences

Research output: Contribution to journal › Article › peer-review

6 Scopus citations

Abstract

A point dilution test is commonly used in single-borehole tracer experiments designed to determine the Darcy velocity of a formation. This method is based on the concept that, in a borehole, a tracer's concentration declines as a consequence of the water flux. Based on theoretical simulations and field observations, this study indicates that for low-permeability, yet highly porous fractured formations, the common practice of excluding the effect of diffusive mass flux between the dissolved tracer within the borehole and the surrounding matrix may lead to significant errors in the assessment of the Darcy velocity. This conclusion was confirmed by a model adapted to simulate experimental data collected from a tracer test performed in a vertical, large-diameter (25-cm) borehole drilled along a subvertical fracture intersecting a chalk formation.

Original language	English
Pages (from-to)	235-241
Number of pages	7
Journal	Ground Water
Volume	45
Issue number	2
DOIs	https://doi.org/10.1111/j.1745-6584.2006.00268.x
State	Published - 1 Mar 2007

ASJC Scopus subject areas

Water Science and Technology
Computers in Earth Sciences

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abstract = "A point dilution test is commonly used in single-borehole tracer experiments designed to determine the Darcy velocity of a formation. This method is based on the concept that, in a borehole, a tracer's concentration declines as a consequence of the water flux. Based on theoretical simulations and field observations, this study indicates that for low-permeability, yet highly porous fractured formations, the common practice of excluding the effect of diffusive mass flux between the dissolved tracer within the borehole and the surrounding matrix may lead to significant errors in the assessment of the Darcy velocity. This conclusion was confirmed by a model adapted to simulate experimental data collected from a tracer test performed in a vertical, large-diameter (25-cm) borehole drilled along a subvertical fracture intersecting a chalk formation.",

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AB - A point dilution test is commonly used in single-borehole tracer experiments designed to determine the Darcy velocity of a formation. This method is based on the concept that, in a borehole, a tracer's concentration declines as a consequence of the water flux. Based on theoretical simulations and field observations, this study indicates that for low-permeability, yet highly porous fractured formations, the common practice of excluding the effect of diffusive mass flux between the dissolved tracer within the borehole and the surrounding matrix may lead to significant errors in the assessment of the Darcy velocity. This conclusion was confirmed by a model adapted to simulate experimental data collected from a tracer test performed in a vertical, large-diameter (25-cm) borehole drilled along a subvertical fracture intersecting a chalk formation.

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Dilution tests in a low-permeability fractured aquifer: Matrix diffusion effect

Abstract

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