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Influence of maceral composition on geochemical characteristics of immature
shale kerogen: Insight from density fraction analysis
Mastalerz, M., Schimmelmann, A., Lis, G.P., Drobniak, A., Stankiewicz, A., 2012,International Journal of Coal Geology, 103, 60-69.
Presenter: Adviser:
Date: 2014/12/25
Outline
Introduction Materials and methods Results and discussion Conclusions
Introduction
Growing interest in shale sequences and shale gas requires a better understanding of the influences of shale composition, porosity, and permeability on shale gas production.
Most of past studies were concentrated on chemical and molecular differences among macerals. Few studies were concentrated on chemical variation, so this study will discuss:
1. aromaticity2. functional group abundance3. elemental composition4. carbon and hydrogen isotopic compositions
Materials and methods
Materials: Shale samples were obtained from the New Albany Shale in Indiana.
Amorphinite and alginite
Sample preparation
This study uses kerogen concentrates that were prepared from shales using wet-chemical acid demineralization
Brij-35
Petrographic analysis
Using a Leitz MPV-II reflected light microscope, in both reflected and fluorescent modes.
500 points.
Nuclear magnetic resonance (NMR) spectroscopy
Fourier transmission infrared spectroscopy
Hydrogen isotopic exchangeability Hex, Dn, and 13C values
Results and discussion
FTIR spectraC=CC=O C-O-C
NMR spectraaromatic region aliphatic region
Hydrogen and carbon isotope ratios and hydrogen exchangeability
Conclusions The density of kerogen in shale depends on
its maceral composition.
Maceral composition of kerogen in immature shale greatly influences the chemistry of bulk kerogen.
The isolation procedure of bulk kerogen from rock must avoid bias against any organic density fractions, so as to ensure the kerogen is representative of the insoluble organic matter in the source rock.
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Keywords
Alginite: consist of structured algae
Amorphinite:Organic matter occurs as amorphous kerogen, formerly called amorphinite. Also called bituminite macerals.