The geochemistry of oil in Cornish granites

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Presentation transcript:

The geochemistry of oil in Cornish granites by Mas'ud Baba, John Parnell, and Stephen Bowden Petroleum Geoscience Volume ():petgeo2018-053 December 19, 2018 © 2018 The Author(s). Published by The Geological Society of London for GSL and EAGE

Map of SW England (after Moon 2010), showing sample sites for oil residues at Wheal Speed, North Treskerby and South Crofty, and samples used for comparison. Map of SW England (after Moon 2010), showing sample sites for oil residues at Wheal Speed, North Treskerby and South Crofty, and samples used for comparison. Oil residues occur close to the margin of granites with Devono-Carboniferous ‘killas’ country rock. BA, Triassic black shale, Blue Anchor; BT, Oligocene lignite, Bovey Tracey; LE, Looe; MP, Mupe Bay; QH, Devonian, Quantock Hills; TD, Treskillard. Mas'ud Baba et al. Petroleum Geoscience 2018;petgeo2018-053 © 2018 The Author(s). Published by The Geological Society of London for GSL and EAGE

Selected ion chromatograms for m/z 85 for oil residues, Cornwall, highlighting normal alkanes. Mas'ud Baba et al. Petroleum Geoscience 2018;petgeo2018-053 © 2018 The Author(s). Published by The Geological Society of London for GSL and EAGE

Ion chromatogram for m/z 217 and 259 highlighting steranes and diasteranes for South Crofty B sample. Ion chromatogram for m/z 217 and 259 highlighting steranes and diasteranes for South Crofty B sample. Mas'ud Baba et al. Petroleum Geoscience 2018;petgeo2018-053 © 2018 The Author(s). Published by The Geological Society of London for GSL and EAGE

Selected ion chromatograms for m/z 217 and 218 for oil residues, Cornwall, highlighting steranes. Mas'ud Baba et al. Petroleum Geoscience 2018;petgeo2018-053 © 2018 The Author(s). Published by The Geological Society of London for GSL and EAGE

Cross-plot of diasterane/sterane ratios and Ph/nC18 ratios for oil residues, Cornwall. Cross-plot of diasterane/sterane ratios and Ph/nC18 ratios for oil residues, Cornwall. South Crofty samples show a wide range of Ph/nC18 ratios, suggesting variable biodegradation after emplacement in granite. Mas'ud Baba et al. Petroleum Geoscience 2018;petgeo2018-053 © 2018 The Author(s). Published by The Geological Society of London for GSL and EAGE

Composition of C27, C28 and C29 steranes (αββ S + R) in samples from Cornwall, determined from m/z 218 chromatograms. Composition of C27, C28 and C29 steranes (αββ S + R) in samples from Cornwall, determined from m/z 218 chromatograms. Compositions cluster between C27 and C29 predominance. Jurassic-sourced oil from Mupe Bay, Dorset, plots within the cluster. However, the sterane compositions of the Devonian, Triassic and Oligocene samples are distinct from those of the granite-hosted samples, and suggest that they are not correlative. Mas'ud Baba et al. Petroleum Geoscience 2018;petgeo2018-053 © 2018 The Author(s). Published by The Geological Society of London for GSL and EAGE

Schematic model of hydrocarbon generation, migration and degradation in SW England (context adapted from Psyrillos et al. 2003). Schematic model of hydrocarbon generation, migration and degradation in SW England (context adapted from Psyrillos et al. 2003). Mas'ud Baba et al. Petroleum Geoscience 2018;petgeo2018-053 © 2018 The Author(s). Published by The Geological Society of London for GSL and EAGE