Non-destructive high-resolution visualization and measurement of anisotropic effective porosity in complex lithologies using high-resolution X-ray computed tomography

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doi: 10.1016/j.jhydrol.2004.06.037
Author(s): Ketcham, Richard A.; Iturrino, Gerardo J.
Author Affiliation(s): Primary:
University of Texas at Austin, Department of Geological Sciences, Austin, TX, United States
Lamont-Doherty Earth Observatory, United States
Volume Title: Journal of Hydrology
Source: Journal of Hydrology, 302(1-4), p.92-106. Publisher: Elsevier, Amsterdam, Netherlands. ISSN: 0022-1694 CODEN: JHYDA7
Note: In English. 27 refs.; illus., incl. 4 tables
Summary: New methods are presented that allow high-resolution X-ray computed tomography (HRXCT) to be utilized for imaging and measuring the effective porosity field of mineralogically complex specimens at resolutions in the 5-100 µm range. These methods extend previous established approaches by allowing sample displacement between successive imaging runs and eliminating the need for a highly-attenuating tracer. A highly detailed map of partial porosity can be generated by scanning a sample in a dry state and infiltrated by distilled water, and performing a three-dimensional alignment of the two data sets. This map can then be used to obtain a number of quantitative analyses, such as the frequency distribution of partial porosity and directional analysis to infer flow anisotropy. It can also be used for petrographic study of the relationship of porosity to evolving mineralogy in a dynamic system. These methods are demonstrated on a series of altered volcanic rocks from a deep-sea hydrothermal field. Abstract Copyright (2005) Elsevier, B.V.
Year of Publication: 2005
Research Program: ODP Ocean Drilling Program
Key Words: 21 Hydrogeology and Hydrology; 27 Economic Geology, Metals; Anisotropy; Bismarck Sea; Computed tomography data; Data processing; Felsic composition; Fluid phase; Fractures; Ground water; High-resolution methods; Hydrology; Hydrothermal alteration; Igneous rocks; Leg 193; Manus Basin; Mapping; Measurement; Metal ores; Metallogeny; Metasomatism; Mineral composition; Mineral deposits, genesis; Mineralization; Movement; Ocean Drilling Program; Pacific Ocean; Permeability; Petrography; Physical properties; Porosity; Precipitation; Pual Ridge; South Pacific; Southwest Pacific; Tracers; Visualization; Volcanic rocks; West Pacific; X-ray data
Coordinates: S034400 S034300 E1514100 E1514000
Record ID: 2005063598
Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from CAPCAS, Elsevier Scientific Publishers, Amsterdam, Netherlands