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Upscaling lithology and porosity-type fractions from the micro- to the core-scale with thin-section petrography, dual-energy computed tomography, and rock typing; creation of diagenesis and porosity-type logs

Jacob M. Proctor, Andre W. Droxler, Naum Derzhi, Heath H. Hopson, Paul Harris, Pankaj Khanna and Daniel J. Lehrmann
Upscaling lithology and porosity-type fractions from the micro- to the core-scale with thin-section petrography, dual-energy computed tomography, and rock typing; creation of diagenesis and porosity-type logs
Interpretation (Tulsa) (February 2019) 7 (1): B9-B32

Abstract

We have developed and validated a new approach to upscale lithology and porosity-type fractions from thin sections to cores using dual energy and multiscale computed tomography (CT). A new rock-typing approach (genetic rock typing [GRT]) is proposed to upscale <-->diagenetic mineral and diagenetic pore-type fractions, from thin sections to the core domain, eventually to create a diagenesis and porosity types logs. An extensive set of short cores from Mason County (Texas) provides a representative sample set of Late Cambrian microbial buildups and their interbuildup sediments to test the GRT approach. GRTs were defined by using a dolomite log as a proxy for diagenesis and the average percentage of dolomite from each observed depositional facies (buildup interior, buildup rind, and interbuildup sediment) as a cutoff. Dolomite, diagenetic calcite, and diagenetic porosity fractions are summed to form a diagenesis log, which captures depositional facies and the diagenetic overprint at a 0.5 mm resolution. The diagenesis log was subdivided based on the number of pore-throat size classes within each GRT and provided a framework to distribute porosity-type fractions from thin sections to log form. A high correlation coefficient is observed when the predicted extent of diagenetic alteration from the log is compared with that quantified for each thin section using image processing (R (super 2) =0.918). Multiscale CT imaging and dual-energy-derived logs could be directly linked to well-log photoelectric factor and bulk-density logs. This approach thus has the ability to span six orders of magnitude in resolution (500-0.0005 mm). The diagenesis log can be used to extrapolate porosity-type fractions from thin sections to logs, from which qualitative geologic interpretations can be generally translated into quantitative values.


ISSN: 2324-8858
EISSN: 2324-8866
Serial Title: Interpretation (Tulsa)
Serial Volume: 7
Serial Issue: 1
Title: Upscaling lithology and porosity-type fractions from the micro- to the core-scale with thin-section petrography, dual-energy computed tomography, and rock typing; creation of diagenesis and porosity-type logs
Affiliation: Rice University, Houston, TX, United States
Pages: B9-B32
Published: 201902
Text Language: English
Publisher: Society of Exploration Geophysicists, Tulsa, OK, United States
References: 34
Accession Number: 2019-009251
Categories: Sedimentary petrology
Document Type: Serial
Bibliographic Level: Analytic
Annotation: Tools, techniques, and tutorials
Illustration Description: illus. incl. 2 tables, strat. col.
N30°30'00" - N30°53'60", W99°45'00" - W98°58'60"
Secondary Affiliation: Ingrain, USA, United StatesTrinity University, USA, United States
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2019, American Geosciences Institute. Reference includes data supplied by Society of Exploration Geophysicists, Tulsa, OK, United States
Update Code: 2019
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