Imperial College London
Alternate

DrJonathanWatson

Faculty of Engineering, Department of Earth Science & Engineering

Research Officer in Organic Geochemistry and Mineralogy
 
 
 
//

Contact

 

+44 (0)20 7594 6399jonathan.watson Website

 
 
//

Location

 

2.60Royal School of MinesSouth Kensington Campus

//

Summary

 

Publications

Citation

BibTex format

@article{Salter:2023:10.1016/j.jaap.2023.105900,
author = {Salter, TL and Watson, JS and Sephton, MA},
doi = {10.1016/j.jaap.2023.105900},
journal = {Journal of Analytical and Applied Pyrolysis},
pages = {1--8},
title = {Effects of minerals (phyllosilicates and iron oxides) on the responses of aliphatic hydrocarbon containing kerogens (Type I and Type II) to analytical pyrolysis},
url = {http://dx.doi.org/10.1016/j.jaap.2023.105900},
volume = {170},
year = {2023}
}
Download

RIS format (EndNote, RefMan)

TY  - JOUR
AB  - Organic matter in sediments is dominated by kerogen, a high molecular weight geomacromolecule. Kerogen can be subdivided into Types I to IV that provide paleoenvironmental and petroleum potential information. Kerogen typing can be performed by several chemical methods including elemental analysis (H/C and O/C), FTIR and pyrolysis-gas chromatography techniques. However, kerogens occur naturally within mineral matrices and these can influence the chemical responses. We have examined the effects of a range of minerals (namely kaolinite, lizardite, ripidolite, illite, montmorillonite, haematite, goethite, limonite and magnetite) on the responses of kerogen to pyrolysis-gas chromatography-mass spectrometry. We used aliphatic hydrocarbon containing kerogen Types I and II from Carboniferous Midland Valley shales of Scotland and the Jurassic Oxford Clay of southern England, respectively, as well as a pure synthetic aliphatic polymer, polyethylene. We find that the aliphatic organic matter in Type I kerogens is transformed by interaction with minerals during pyrolysis to give a signal incorrectly suggesting more contributions from land plant-containing kerogens, such as a large number of aromatic molecules. Pyrolysis with goethite, limonite and magnetite leads to almost complete destruction of the organic matter. Hence, the mineral composition of sedimentary rocks during pyrolysis should be considered when assigning kerogen types. Failure to consider the effects of minerals can lead to incorrect assignment of kerogen type and, therefore, erroneous interpretations of paleoenvironments and petroleum potential.
AU  - Salter,TL
AU  - Watson,JS
AU  - Sephton,MA
DO  - 10.1016/j.jaap.2023.105900
EP  - 8
PY  - 2023///
SN  - 0165-2370
SP  - 1
TI  - Effects of minerals (phyllosilicates and iron oxides) on the responses of aliphatic hydrocarbon containing kerogens (Type I and Type II) to analytical pyrolysis
T2  - Journal of Analytical and Applied Pyrolysis
UR  - http://dx.doi.org/10.1016/j.jaap.2023.105900
UR  - https://www.sciencedirect.com/science/article/pii/S016523702300044X?via%3Dihub
UR  - http://hdl.handle.net/10044/1/102007
VL  - 170
ER  -
Download