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Pore scale characterization of carbonates at multiple scales: integration of micro-CT BSEM and FIBSEM

Sok, Robert; Varslot, Trond; Ghous, Abid; Latham, Shane; Sheppard, Adrian; Knackstedt, Mark

Description

The understanding of petrophysical and multiphase flow properties is essential for the assessment and exploitation of hydrocarbon reserves; these properties in turn are dependent on the 3D geometric and connectivity properties of the pore space. The determination of the pore size distribution in carbonate rocks remains challenging; extreme variability in carbonate depositional environments and susceptibility to a range of post-depositional processes results in complex pore structures comprising...[Show more]

dc.contributor.authorSok, Robert
dc.contributor.authorVarslot, Trond
dc.contributor.authorGhous, Abid
dc.contributor.authorLatham, Shane
dc.contributor.authorSheppard, Adrian
dc.contributor.authorKnackstedt, Mark
dc.date.accessioned2015-12-10T22:51:23Z
dc.identifier.issn1529-9074
dc.identifier.urihttp://hdl.handle.net/1885/59024
dc.description.abstractThe understanding of petrophysical and multiphase flow properties is essential for the assessment and exploitation of hydrocarbon reserves; these properties in turn are dependent on the 3D geometric and connectivity properties of the pore space. The determination of the pore size distribution in carbonate rocks remains challenging; extreme variability in carbonate depositional environments and susceptibility to a range of post-depositional processes results in complex pore structures comprising length scales from tens of nanometers to several centimeters. To increase understanding of the role of pore structure on connectivity, conductivity, permeability and recoveries requires one to probe the pore scale structure in carbonates in a continuous range across over seven decades of length scales (from 10 nm to 10 cm) and to integrate information at these different scales. In this paper experimental techniques including micro-computed tomography, backscattered scanning electron microscopy (BSEM), and Focussed ion beam SEM (FIBSEM) are used to probe the pore scale structure in carbonates across many decades of scale. Registration techniques are then used to couple information at different length scales. First an image of a 3D plug (4 cm, 20 micron voxel size) is correlated to a sample at macroporous resolutions (8 mm diameter, 4 micron voxel size). We then focus on coupling SEM and FIBSEM data at submicron resolutions to micro-CT data at ≈3-5 micron resolution. For pixel perfect registration of SEM images, an accurate template has been developed to remove warp artefacts introduced by the SEM scanning procedure and we have successfully mapped the sub-resolution porosity and pore sizes visible in the SEM image to gray scale levels in the 3D image. FIBSEM also allows one to investigate the 3D structure in samples down to tens of nanometers. We briefly discuss how this multiscale information can be used as a method for enhanced analysis of petrophysical properties of carbonates.
dc.publisherSociety of Petrophysicists and Well Log Analysts (SPWLA)
dc.sourcePetrophysics
dc.subjectKeywords: 3-5 micron; 3-D image; 3D Structure; Back-scattered; Carbonate rock; Connectivity properties; Depositional environment; Different length scale; Different scale; Experimental techniques; Focussed ion beams; Gray scale; Hydrocarbon reserves; Length scale; M
dc.titlePore scale characterization of carbonates at multiple scales: integration of micro-CT BSEM and FIBSEM
dc.typeJournal article
local.description.notesImported from ARIES
local.identifier.citationvolume51
dc.date.issued2010
local.identifier.absfor080106 - Image Processing
local.identifier.absfor040309 - Petroleum and Coal Geology
local.identifier.absfor020402 - Condensed Matter Imaging
local.identifier.ariespublicationu9210271xPUB469
local.type.statusPublished Version
local.contributor.affiliationSok, Robert, College of Physical and Mathematical Sciences, ANU
local.contributor.affiliationVarslot, Trond, College of Physical and Mathematical Sciences, ANU
local.contributor.affiliationGhous, Abid, College of Physical and Mathematical Sciences, ANU
local.contributor.affiliationLatham, Shane, College of Physical and Mathematical Sciences, ANU
local.contributor.affiliationSheppard, Adrian, College of Physical and Mathematical Sciences, ANU
local.contributor.affiliationKnackstedt, Mark, College of Physical and Mathematical Sciences, ANU
local.description.embargo2037-12-31
local.bibliographicCitation.issue6
local.bibliographicCitation.startpage379
local.bibliographicCitation.lastpage387
dc.date.updated2016-02-24T11:56:00Z
local.identifier.scopusID2-s2.0-79551610056
local.identifier.thomsonID000285443400002
CollectionsANU Research Publications

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