Discriminating effects of heterogeneity and matrix diffusion by alternative tracer designs

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Flow and transport calculations are carried out by numerical simulation for different tracer designs: single-well radially diverging/converging (huff-puff), single well radially converging, and two-well injection-withdrawal (doublet) in a 2D fracture zone. The fractured rocks are conceptualized as a dual-continuum: the well-connected fractures forming a heterogeneous continuum for advective transport, and the less permeable matrix forming a second continuum for tracer diffusion. Results show that the huff-puff design can be a good diagnostic test for matrix diffusion. The two-well doublet design averages over a large volume and corrects for the extreme sensitivity to spatial heterogeneities of the single well converging test, ... continued below

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14 p.

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Tsang, Y.Y.W. March 1, 1995.

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Description

Flow and transport calculations are carried out by numerical simulation for different tracer designs: single-well radially diverging/converging (huff-puff), single well radially converging, and two-well injection-withdrawal (doublet) in a 2D fracture zone. The fractured rocks are conceptualized as a dual-continuum: the well-connected fractures forming a heterogeneous continuum for advective transport, and the less permeable matrix forming a second continuum for tracer diffusion. Results show that the huff-puff design can be a good diagnostic test for matrix diffusion. The two-well doublet design averages over a large volume and corrects for the extreme sensitivity to spatial heterogeneities of the single well converging test, but requires prior knowledge of presence or absence of matrix diffusion to give reliable estimate of transport parameters. Results of this study demonstrate that using a suite of different tracer designs is important to reduce the uncertainty in association with solving the inverse problem of tracer test interpretation to characterize transport in fractured rocks.

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14 p.

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OSTI as DE95012376

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  • Other Information: PBD: Mar 1995

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  • Other: DE95012376
  • Report No.: LBL--36831
  • Grant Number: AC03-76SF00098
  • DOI: 10.2172/70742 | External Link
  • Office of Scientific & Technical Information Report Number: 70742
  • Archival Resource Key: ark:/67531/metadc711800

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  • March 1, 1995

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  • Sept. 12, 2015, 6:31 a.m.

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  • April 4, 2016, 9:14 p.m.

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Tsang, Y.Y.W. Discriminating effects of heterogeneity and matrix diffusion by alternative tracer designs, report, March 1, 1995; California. (digital.library.unt.edu/ark:/67531/metadc711800/: accessed September 24, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.