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Lithological and chemostratigraphic discrimination of facies within the Bowland Shale Formation within the Craven and Edale Basins, UK

Colin N. Waters, Christopher H. Vane, Simon J. Kemp, Richard B. Haslam, Edward Hough and Vicky L. Moss-Hayes
Lithological and chemostratigraphic discrimination of facies within the Bowland Shale Formation within the Craven and Edale Basins, UK
Petroleum Geoscience (March 2019) Pre-Issue Publication

Abstract

The Carboniferous Bowland Shale Formation of the UK is a proven hydrocarbon source rock and currently a target for shale gas exploration. Most existing analysis details lithofacies and geochemical assessment of a small number of boreholes. Given a paucity of relevant borehole cores, surface samples provide a valuable contribution to the assessment of this unconventional gas source. This study reviews existing literature on the formation's hydrocarbon geochemistry and provides new lithological descriptions of seven lithofacies, XRD mineralogy and hydrocarbon-specific geochemical data for 32 outcrop localities within the Craven and Edale basins, respectively in the northern and southern parts of the resource area. Low oxygen indices suggest that the majority of samples are relatively unaltered (in terms of hydrocarbon geochemistry), and therefore suitable for the characterisation of the shale organic character. Total organic carbon (TOC) ranges from 0.7 to 6.5 wt %, with highest values associated with maximum flooding surfaces. Mean T (sub max) values of 447 degrees C and 441 degrees C for the Edale and Craven basins, respectively, suggest nearly all the samples were too immature to have generated appreciable amounts of dry gas. The oil saturation index is consistently below the >100 mg/g TOC benchmark, suggesting that they are not prospective for shale-oil. Supplementary material: description of sample location details is available at https://doi.org/10.6084/m9.figshare.c.4444589.


ISSN: 1354-0793
Serial Title: Petroleum Geoscience
Serial Volume: Pre-Issue Publication
Title: Lithological and chemostratigraphic discrimination of facies within the Bowland Shale Formation within the Craven and Edale Basins, UK
Affiliation: British Geological Survey, Keyworth, United Kingdom
Published: 20190328
Text Language: English
Publisher: Geological Society Publishing House for EAGE (European Association of Geoscientists & Engineers), London, United Kingdom
References: 30
Accession Number: 2019-033966
Categories: Economic geology, geology of energy sourcesStratigraphy
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. strat. cols., geol. sketch maps
N52°40'00" - N55°30'00", W04°00'00" - E00°00'00"
Secondary Affiliation: University of Leicester, GBR, United Kingdom
Country of Publication: United Kingdom
Secondary Affiliation: GeoRef, Copyright 2019, American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States. Reference includes data from The Geological Society, London, London, United Kingdom
Update Code: 2019
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