S. Killops | Semi-retired Researcher (original) (raw)
Papers by S. Killops
Organic Geochemistry, 2019
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ABSTRACT
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Organic Geochemistry, 2021
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Journal of Petroleum Geology, 1998
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Journal of High Resolution Chromatography, 1986
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Water Research, 1986
ABSTRACT Humic and fulvic acid samples, extracted from river water, and two upland waters with hi... more ABSTRACT Humic and fulvic acid samples, extracted from river water, and two upland waters with high humic content were studied. Aqueous solutions were effectively decolourized by ozonization ( ⩽ 3 mg ozone mg−1 humic substance), although significant chemical alteration of the bulk humic material was not detected. The greater proportion of the material remained as polymeric structures, and typically < 10% comprised relatively volatile material, which was isolated by XAD-2 resin and subjected to GC-MS analysis.GC-MS analysis provided some evidence for the formation of carbonyl groups (chiefly COOH) among the volatiles from the humic and fulvic acids. Apart from the fulvic acid, ozonization failed to increase the amount of volatile components extracted by XAD-2 resin. The volatiles chiefly appeared to be species trapped in the macromolecular structure of the humic material. Some changes were noted among the volatiles of fulvic and humic acids following ozonization (e.g. increase in n-alkanes and disappearance of alkylnaphthalenes), but volatiles from the upland waters appeared more resistant towards oxidation.
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Organic Geochemistry, 1991
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Chemosphere, 1986
ABSTRACT Separation of neutral extracts from sediments and oils into aliphatic and aromatic fract... more ABSTRACT Separation of neutral extracts from sediments and oils into aliphatic and aromatic fractions by simple fractionation techniques may not be sufficiently accurate for complete resolution of these hydrocarbon classes. In particular, the profiles of unresolved complex mixture (UCM) from GC analysis can be significantly affected by the fractionation method employed. Results obtained from a number of sediment extracts suggest that screening of the aromatic UCM by normal phase HPLC may provide a rapid technique for assessing the relative levels of petrogenic contamination in such sediments. HPLC sub-fractionation of aromatic components and subsequent GC analysis resulted in varying UCM profiles for each fraction, suggesting that HPLC fractionation may provide a means to study the composition of the aromatic UCM.
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Analytica Chimica Acta, 1986
... 0.3jurn WCOT OV1, glass column (Jaeggi) and helium carrier gas (ca. 1.2 kg cm', ca. 3 cm... more ... 0.3jurn WCOT OV1, glass column (Jaeggi) and helium carrier gas (ca. 1.2 kg cm', ca. 3 cm' min'). ... Commun., 4 (1980) 641. 36 SR Lipsky and WC MeMurray, J. Chromatogr., 217 (1981) 3. 3 7 P. Sandra, M. Schelfaut and M. Verzele, J. High Resolut. Chromatogr., Chrornatogr. ...
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The Taranaki Basin has undergone several phases of deformation, with multiple phases of depositio... more The Taranaki Basin has undergone several phases of deformation, with multiple phases of deposition and uplift. This complex history has led to a complex temporal and spatial pattern of hydrocarbon maturation and migration. Integration of structural and paleogeographic basin mapping with analysis of regional petrophysical, geothermal and geochemical data has allowed us to model the generation and migration of hydrocarbons. One of the primary inputs for the project is the set of structural and isopach maps of the basin. Mapped sedimentary units are Rakopi (Late Cretaceous), North Cape (Late Cretaceous), Paleocene to Oligocene, Miocene, and Pliocene to Pleistocene. Isopach data are gridded on a 1 km grid using a Geographic Information System (GIS), and decompacted according to estimated lithology. In addition, paleogeographic maps are used to predict the distribution of source rocks, reservoirs and paleo-bathymetry. Erosional events in the Late Miocene and Pliocene are identified and t...
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Organic Geochemistry, 1994
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Geofluids, 2005
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AAPG Bulletin, 1994
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AAPG Bulletin, 1994
... Czochanska Z., TD Gilbert, RP Philp, CM Sheppard, RJ Weston, TA Wood, and AD Woolhouse, 1988,... more ... Czochanska Z., TD Gilbert, RP Philp, CM Sheppard, RJ Weston, TA Wood, and AD Woolhouse, 1988, Geochemical application of sterane and triterpane biomarkers to a description of oils from the Taranaki Basin in New Zealand: Organic Geochemistry, v. 12, p. 123-135. ...
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AAPG Bulletin, 1996
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Organic Geochemistry, 2019
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ABSTRACT
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Organic Geochemistry, 2021
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Journal of Petroleum Geology, 1998
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Journal of High Resolution Chromatography, 1986
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Water Research, 1986
ABSTRACT Humic and fulvic acid samples, extracted from river water, and two upland waters with hi... more ABSTRACT Humic and fulvic acid samples, extracted from river water, and two upland waters with high humic content were studied. Aqueous solutions were effectively decolourized by ozonization ( ⩽ 3 mg ozone mg−1 humic substance), although significant chemical alteration of the bulk humic material was not detected. The greater proportion of the material remained as polymeric structures, and typically < 10% comprised relatively volatile material, which was isolated by XAD-2 resin and subjected to GC-MS analysis.GC-MS analysis provided some evidence for the formation of carbonyl groups (chiefly COOH) among the volatiles from the humic and fulvic acids. Apart from the fulvic acid, ozonization failed to increase the amount of volatile components extracted by XAD-2 resin. The volatiles chiefly appeared to be species trapped in the macromolecular structure of the humic material. Some changes were noted among the volatiles of fulvic and humic acids following ozonization (e.g. increase in n-alkanes and disappearance of alkylnaphthalenes), but volatiles from the upland waters appeared more resistant towards oxidation.
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Organic Geochemistry, 1991
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Chemosphere, 1986
ABSTRACT Separation of neutral extracts from sediments and oils into aliphatic and aromatic fract... more ABSTRACT Separation of neutral extracts from sediments and oils into aliphatic and aromatic fractions by simple fractionation techniques may not be sufficiently accurate for complete resolution of these hydrocarbon classes. In particular, the profiles of unresolved complex mixture (UCM) from GC analysis can be significantly affected by the fractionation method employed. Results obtained from a number of sediment extracts suggest that screening of the aromatic UCM by normal phase HPLC may provide a rapid technique for assessing the relative levels of petrogenic contamination in such sediments. HPLC sub-fractionation of aromatic components and subsequent GC analysis resulted in varying UCM profiles for each fraction, suggesting that HPLC fractionation may provide a means to study the composition of the aromatic UCM.
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Analytica Chimica Acta, 1986
... 0.3jurn WCOT OV1, glass column (Jaeggi) and helium carrier gas (ca. 1.2 kg cm', ca. 3 cm... more ... 0.3jurn WCOT OV1, glass column (Jaeggi) and helium carrier gas (ca. 1.2 kg cm', ca. 3 cm' min'). ... Commun., 4 (1980) 641. 36 SR Lipsky and WC MeMurray, J. Chromatogr., 217 (1981) 3. 3 7 P. Sandra, M. Schelfaut and M. Verzele, J. High Resolut. Chromatogr., Chrornatogr. ...
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The Taranaki Basin has undergone several phases of deformation, with multiple phases of depositio... more The Taranaki Basin has undergone several phases of deformation, with multiple phases of deposition and uplift. This complex history has led to a complex temporal and spatial pattern of hydrocarbon maturation and migration. Integration of structural and paleogeographic basin mapping with analysis of regional petrophysical, geothermal and geochemical data has allowed us to model the generation and migration of hydrocarbons. One of the primary inputs for the project is the set of structural and isopach maps of the basin. Mapped sedimentary units are Rakopi (Late Cretaceous), North Cape (Late Cretaceous), Paleocene to Oligocene, Miocene, and Pliocene to Pleistocene. Isopach data are gridded on a 1 km grid using a Geographic Information System (GIS), and decompacted according to estimated lithology. In addition, paleogeographic maps are used to predict the distribution of source rocks, reservoirs and paleo-bathymetry. Erosional events in the Late Miocene and Pliocene are identified and t...
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Organic Geochemistry, 1994
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Geofluids, 2005
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AAPG Bulletin, 1994
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AAPG Bulletin, 1994
... Czochanska Z., TD Gilbert, RP Philp, CM Sheppard, RJ Weston, TA Wood, and AD Woolhouse, 1988,... more ... Czochanska Z., TD Gilbert, RP Philp, CM Sheppard, RJ Weston, TA Wood, and AD Woolhouse, 1988, Geochemical application of sterane and triterpane biomarkers to a description of oils from the Taranaki Basin in New Zealand: Organic Geochemistry, v. 12, p. 123-135. ...
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AAPG Bulletin, 1996
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