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Application of micro-FTIR and SEM to...

Gasaway, Carley.

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Application of micro-FTIR and SEM to study heterogeneity of Late Devonian- Early Mississippian shales and siltstones.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Application of micro-FTIR and SEM to study heterogeneity of Late Devonian- Early Mississippian shales and siltstones./
作者:	Gasaway, Carley.
出版者:	Ann Arbor : ProQuest Dissertations & Theses, : 2016,
面頁冊數:	74 p.
附註:	Source: Masters Abstracts International, Volume: 55-04.
Contained By:	Masters Abstracts International55-04(E).
標題:	Geology. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=10109569
ISBN:	9781339728537

Application of micro-FTIR and SEM to study heterogeneity of Late Devonian- Early Mississippian shales and siltstones.
Gasaway, Carley.

Application of micro-FTIR and SEM to study heterogeneity of Late Devonian- Early Mississippian shales and siltstones. - Ann Arbor : ProQuest Dissertations & Theses, 2016 - 74 p.

Source: Masters Abstracts International, Volume: 55-04.

Thesis (M.S.)--Indiana University, 2016.

This item is not available from ProQuest Dissertations & Theses.

Samples of Late Devonian/Early Mississippian New Albany Shale from the Illinois Basin, with maturities ranging from early-mature to post mature, were analyzed with micro-FTIR spectroscopy, ImageJ processing software, and scanning electron microscopic X-ray spectroscopy to explore the distribution, connectivity, and chemical composition of organic matter (OM), clay minerals, carbonates, and quartz, and to further test the applicability of micro-FTIR mapping to study shale heterogeneity. Each sample was analyzed in planes parallel and perpendicular to the bedding in order to investigate anisotropy in component distribution, with a possible implication for better understanding anisotropy in porosity and permeability in OM-rich shales. Our results show that for low maturity samples OM is better connected in the plane parallel to the bedding than in the plane perpendicular to the bedding. OM connectivity decreases with increasing maturity, as a result of kerogen transformation. Clay minerals are very well connected in both planes, whereas carbonates are not abundant and dominantly isolated in most samples, independent of maturity. This study demonstrates that micro-FTIR mapping is a valuable tool to study shale heterogeneity on a micrometer to millimeter scale, and becomes even more powerful in combination with scanning electron microscopy (SEM) techniques that extend observations to a nanometer scale. However, in order to obtain meaningful and comparable results, micro-FTIR mapping requires very careful standardization, precise selection of peak heights/areas, and mapping conditions (such as aperture size, scan numbers, resolution, etc.) well suited for the analyzed samples.

ISBN: 9781339728537Subjects--Topical Terms:

516570
Geology.

Application of micro-FTIR and SEM to study heterogeneity of Late Devonian- Early Mississippian shales and siltstones.
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520 $a Samples of Late Devonian/Early Mississippian New Albany Shale from the Illinois Basin, with maturities ranging from early-mature to post mature, were analyzed with micro-FTIR spectroscopy, ImageJ processing software, and scanning electron microscopic X-ray spectroscopy to explore the distribution, connectivity, and chemical composition of organic matter (OM), clay minerals, carbonates, and quartz, and to further test the applicability of micro-FTIR mapping to study shale heterogeneity. Each sample was analyzed in planes parallel and perpendicular to the bedding in order to investigate anisotropy in component distribution, with a possible implication for better understanding anisotropy in porosity and permeability in OM-rich shales. Our results show that for low maturity samples OM is better connected in the plane parallel to the bedding than in the plane perpendicular to the bedding. OM connectivity decreases with increasing maturity, as a result of kerogen transformation. Clay minerals are very well connected in both planes, whereas carbonates are not abundant and dominantly isolated in most samples, independent of maturity. This study demonstrates that micro-FTIR mapping is a valuable tool to study shale heterogeneity on a micrometer to millimeter scale, and becomes even more powerful in combination with scanning electron microscopy (SEM) techniques that extend observations to a nanometer scale. However, in order to obtain meaningful and comparable results, micro-FTIR mapping requires very careful standardization, precise selection of peak heights/areas, and mapping conditions (such as aperture size, scan numbers, resolution, etc.) well suited for the analyzed samples.
520 $a Closely spaced samples of Late Devonian dolomitic siltstones of the Middle Bakken Member in Saskatchewan were analyzed with micro-FTIR, ImageJ image processing, powder X-ray diffraction, and SEM to explore the distribution and chemical properties of OM, clay minerals, carbonates, and quartz and their influence on porosity and permeability of these rocks. Our results show that quartz is the dominant component of the samples, and the main mineralogical differences between the samples are reflected in the content of carbonate minerals. OM content is usually far below 1 wt. % and represented dominantly by terrestrially derived vitrinite and inertinite. Micro-FTIR mapping demonstrates that the more connected quartz and clay minerals become, the larger permeability in the rock develops, and the correlation is especially strong for planes parallel to bedding. In contrast, carbonate connectivity shows a strong negative correlation with permeability. No correlations between connectivity of components and porosity have been detected.
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