Hydraulic characterization and upscaling of fracture networks based on multiple-scale well test data

Auli Niemi, Kimmo Kontio, Auli Kuusela-Lahtinen, Antti Poteri

Research output: Contribution to journalArticleScientificpeer-review

39 Citations (Scopus)

Abstract

Hydraulic properties and upscaling characteristics of low‐permeability fractured rock are analyzed based on systematic well test data from three different measurement scales. First, tests are simulated in a large number of geological fracture network realizations, and the acceptable fracture transmissivity distribution parameters that produce the observed statistics of the two smallest measurement scales, i.e., 2‐m and 10‐m scales, are defined. Instead of a single value, a range of acceptable parameter values can be found to produce the observed result. Second, upscaling simulations are carried out with the calibrated networks. These indicate that the investigated system cannot be properly modeled by means of a continuum tensor presentation but would better be represented by means of “equivalent fracture” statistics. Third, the conductive characteristics of the calibrated 30‐m network blocks are compared to well test results from the same scale. The results from this preliminary analysis indicate that one‐dimensional borehole observations interpreted with standard continuum‐based methods may considerably underestimate the three‐dimensional conductive characteristics of heterogeneous, noncontinuum fractured media.

Original languageEnglish
Pages (from-to)3481-3497
Number of pages17
JournalWater Resources Research
Volume36
Issue number12
DOIs
Publication statusPublished - 2000
MoE publication typeA1 Journal article-refereed

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upscaling
fracture network
hydraulics
well
fractured medium
transmissivity
hydraulic property
borehole
rock
simulation
test
parameter
statistics

Cite this

Niemi, Auli ; Kontio, Kimmo ; Kuusela-Lahtinen, Auli ; Poteri, Antti. / Hydraulic characterization and upscaling of fracture networks based on multiple-scale well test data. In: Water Resources Research. 2000 ; Vol. 36, No. 12. pp. 3481-3497.
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Hydraulic characterization and upscaling of fracture networks based on multiple-scale well test data. / Niemi, Auli; Kontio, Kimmo; Kuusela-Lahtinen, Auli; Poteri, Antti.

In: Water Resources Research, Vol. 36, No. 12, 2000, p. 3481-3497.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

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AU - Kontio, Kimmo

AU - Kuusela-Lahtinen, Auli

AU - Poteri, Antti

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N2 - Hydraulic properties and upscaling characteristics of low‐permeability fractured rock are analyzed based on systematic well test data from three different measurement scales. First, tests are simulated in a large number of geological fracture network realizations, and the acceptable fracture transmissivity distribution parameters that produce the observed statistics of the two smallest measurement scales, i.e., 2‐m and 10‐m scales, are defined. Instead of a single value, a range of acceptable parameter values can be found to produce the observed result. Second, upscaling simulations are carried out with the calibrated networks. These indicate that the investigated system cannot be properly modeled by means of a continuum tensor presentation but would better be represented by means of “equivalent fracture” statistics. Third, the conductive characteristics of the calibrated 30‐m network blocks are compared to well test results from the same scale. The results from this preliminary analysis indicate that one‐dimensional borehole observations interpreted with standard continuum‐based methods may considerably underestimate the three‐dimensional conductive characteristics of heterogeneous, noncontinuum fractured media.

AB - Hydraulic properties and upscaling characteristics of low‐permeability fractured rock are analyzed based on systematic well test data from three different measurement scales. First, tests are simulated in a large number of geological fracture network realizations, and the acceptable fracture transmissivity distribution parameters that produce the observed statistics of the two smallest measurement scales, i.e., 2‐m and 10‐m scales, are defined. Instead of a single value, a range of acceptable parameter values can be found to produce the observed result. Second, upscaling simulations are carried out with the calibrated networks. These indicate that the investigated system cannot be properly modeled by means of a continuum tensor presentation but would better be represented by means of “equivalent fracture” statistics. Third, the conductive characteristics of the calibrated 30‐m network blocks are compared to well test results from the same scale. The results from this preliminary analysis indicate that one‐dimensional borehole observations interpreted with standard continuum‐based methods may considerably underestimate the three‐dimensional conductive characteristics of heterogeneous, noncontinuum fractured media.

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