Reservoir characterization of the Duvernay Formation, Alberta : a pore- to basin-scale investigation

The reservoir properties of the Duvernay Formation mudrock gas and oil (“shale gas”) reservoir in Alberta were investigated. The investigation included an assessment of current methodologies utilized to study mudrocks, development of new methodologies, pore- to basin-scale characterization and integ...

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Main Author: Munson, Erik Ole
Language:English
Published: University of British Columbia 2015
Online Access:http://hdl.handle.net/2429/54790
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spelling ndltd-UBC-oai-circle.library.ubc.ca-2429-547902018-01-05T17:28:31Z Reservoir characterization of the Duvernay Formation, Alberta : a pore- to basin-scale investigation Munson, Erik Ole The reservoir properties of the Duvernay Formation mudrock gas and oil (“shale gas”) reservoir in Alberta were investigated. The investigation included an assessment of current methodologies utilized to study mudrocks, development of new methodologies, pore- to basin-scale characterization and integration of core data with wireline logs. The Duvernay exists over multiple thermal maturity boundaries and provides a laboratory to investigate numerous pertinent research questions. Deposition of organic-rich Duvernay mudrocks was controlled by the spatial relationship to Leduc reef complexes. Greater thicknesses (> 70 m) of Duvernay mudrocks are found within embayments where oxygenated water circulation was most restricted. The Duvernay progressively thins (< 5 m) to the basin center where organic-lean lime mudstones were deposited instead of Duvernay mudrocks. Core samples were taken from eight wells to form a high-resolution database of rock properties including mineralogy, total organic carbon (TOC) content, and total porosity. Duvernay mudrocks average between 2.4 % and 5.6 % total porosity and between 3.0 % and 4.4 % TOC per well. A regional lime mudstone within the Duvernay averages less than 2 % porosity and 0.5 % TOC and therefore is considered to be of poor reservoir quality. Artificial neural network models were used to successfully integrate laboratory data with wireline logs to predict rock properties in wells without laboratory data, providing enhanced correlation coefficients over linear regressions (R=0.82 versus R=0.67). The pore structure of Duvernay mudrocks varies systematically with thermal maturity. Fine pore sizes (micro- and fine mesopores) hosted within organic matter progressively increase in volume as thermal maturity increases. Coarse pore sizes (coarse meso- to macropores) progressively decrease in volume with increasing burial depth due to compaction. Wet and dry gas window samples have average pulse-decay permeabilities (PDP) an order of magnitude higher (1.8 x 10-⁴ mD) than oil window samples (1.6 x 10-⁵ mD), despite the shift in pore modality to finer sizes. The network of fine pores developed with maturity and associated with organic matter is sufficiently connected to contribute to higher PDP values. Gas expansion permeability experiments further indicate fine pores are connected and yield increased matrix permeabilities. Science, Faculty of Earth, Ocean and Atmospheric Sciences, Department of Graduate 2015-09-14T17:10:32Z 2015-10-24T02:00:40 2015 2015-11 Text Thesis/Dissertation http://hdl.handle.net/2429/54790 eng Attribution-NonCommercial-NoDerivs 2.5 Canada http://creativecommons.org/licenses/by-nc-nd/2.5/ca/ University of British Columbia
collection NDLTD
language English
sources NDLTD
description The reservoir properties of the Duvernay Formation mudrock gas and oil (“shale gas”) reservoir in Alberta were investigated. The investigation included an assessment of current methodologies utilized to study mudrocks, development of new methodologies, pore- to basin-scale characterization and integration of core data with wireline logs. The Duvernay exists over multiple thermal maturity boundaries and provides a laboratory to investigate numerous pertinent research questions. Deposition of organic-rich Duvernay mudrocks was controlled by the spatial relationship to Leduc reef complexes. Greater thicknesses (> 70 m) of Duvernay mudrocks are found within embayments where oxygenated water circulation was most restricted. The Duvernay progressively thins (< 5 m) to the basin center where organic-lean lime mudstones were deposited instead of Duvernay mudrocks. Core samples were taken from eight wells to form a high-resolution database of rock properties including mineralogy, total organic carbon (TOC) content, and total porosity. Duvernay mudrocks average between 2.4 % and 5.6 % total porosity and between 3.0 % and 4.4 % TOC per well. A regional lime mudstone within the Duvernay averages less than 2 % porosity and 0.5 % TOC and therefore is considered to be of poor reservoir quality. Artificial neural network models were used to successfully integrate laboratory data with wireline logs to predict rock properties in wells without laboratory data, providing enhanced correlation coefficients over linear regressions (R=0.82 versus R=0.67). The pore structure of Duvernay mudrocks varies systematically with thermal maturity. Fine pore sizes (micro- and fine mesopores) hosted within organic matter progressively increase in volume as thermal maturity increases. Coarse pore sizes (coarse meso- to macropores) progressively decrease in volume with increasing burial depth due to compaction. Wet and dry gas window samples have average pulse-decay permeabilities (PDP) an order of magnitude higher (1.8 x 10-⁴ mD) than oil window samples (1.6 x 10-⁵ mD), despite the shift in pore modality to finer sizes. The network of fine pores developed with maturity and associated with organic matter is sufficiently connected to contribute to higher PDP values. Gas expansion permeability experiments further indicate fine pores are connected and yield increased matrix permeabilities. === Science, Faculty of === Earth, Ocean and Atmospheric Sciences, Department of === Graduate
author Munson, Erik Ole
spellingShingle Munson, Erik Ole
Reservoir characterization of the Duvernay Formation, Alberta : a pore- to basin-scale investigation
author_facet Munson, Erik Ole
author_sort Munson, Erik Ole
title Reservoir characterization of the Duvernay Formation, Alberta : a pore- to basin-scale investigation
title_short Reservoir characterization of the Duvernay Formation, Alberta : a pore- to basin-scale investigation
title_full Reservoir characterization of the Duvernay Formation, Alberta : a pore- to basin-scale investigation
title_fullStr Reservoir characterization of the Duvernay Formation, Alberta : a pore- to basin-scale investigation
title_full_unstemmed Reservoir characterization of the Duvernay Formation, Alberta : a pore- to basin-scale investigation
title_sort reservoir characterization of the duvernay formation, alberta : a pore- to basin-scale investigation
publisher University of British Columbia
publishDate 2015
url http://hdl.handle.net/2429/54790
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