Total organic carbon evaluation of the Bowland Shale Formation in the Upper Bowland of the Widmerpool Gulf

Kenomore, Michael; Hassan, Mohamed; Dhakal, Hom Nath; Shah, Amjad

doi:10.1016/j.petrol.2016.11.040

Cited by 25 publications

(13 citation statements)

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“…When overlain correctly, the TOC curve was well calibrated with the measured TOC from Andrews (2013). As highlighted by Kenomore et al (2017), the lean shale point is difficult to establish when just considering two wells with limited core data. For this study the lean shale point was chosen to fall in the central part of the Morridge Formation for both Old Dalby 1 and Rempstone 1 (~1250 m and ~690 m respectively).…”

Section: The δLog R (Passey) Methodologymentioning

confidence: 99%

“…The schematic lithological logs of Yeadonian and older deposits in the boreholes are depicted in Figure 3c following Andrews (2013) and Pharaoh et al (2011). These logs have been coloured to reflect the lithology in function of the informal BHU introduced in section 2.2 and indicated the intervals for which Kenomore et al (2017) applied the ΔLog R method (black) and the intervals for which Rock-Eval data was published by Andrews (2013). Analysis of Figure 1 and Figure 3 raises two issues:…”

Section: The Rempstone 1 and Old Dalby 1 Boreholesmentioning

confidence: 99%

“…the Morridge Formation), were identified as potentially prospective targets for shale gas and oil (Selley, 1987;Smith et al, 2010). One of the sub-basins, the Widmerpool Gulf, is the subject of a recent study by Kenomore et al (2017) with the remit of:…”

Section: Introductionmentioning

confidence: 99%

“…For example, the Andrews (2013) report for the Pennine Basin in its entirety only contains 109 Rock-Eval pyrolysis data points (17 boreholes; 1028.25m of core). Kenomore et al (2017) had potential to be a valuable addition to the sparse dataset characterizing this potentially important source of indigenous energy in the UK. However, a detailed analysis of the paper revealed many misconceptions and shortcomings.…”

Section: Introductionmentioning

confidence: 99%

“…These are the main reasons for the conception of the current manuscript. As pointed out, but inadequately referenced, on p. 138 in Kenomore et al (2017), the ΔLog R method (colloquially called the 'Passey technique', following Passey, 1990) was used before to assess TOC values of Jurassic shales of the Weald Basin (Gent et al, 2014in Andrews, 2014 but was hitherto not applied to the Carboniferous data set from the Pennine Basin.…”

Section: Introductionmentioning

confidence: 99%

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Total organic carbon in the Bowland-Hodder Unit of the southern Widmerpool Gulf: a discussion

Hennissen

Gent

2019

Journal of Petroleum Science and Engineering

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This review of the article by Kenomore et al. (2017) on the total organic carbon (TOC) evaluation of the Bowland Shale Formation in the Widmerpool Gulf sub-basin (southern Pennine Basin, UK) reveals a number of flaws, rooted mostly in an inadequate appreciation of the local mid-Carboniferous stratigraphy. Kenomore et al. use the ΔLog R, the 'Passey' method after Passey et al. (1990), to evaluate the TOC content in two boreholes in the Widmerpool Gulf: Rempstone 1 and Old Dalby 1. We show here that Kenomore and co-authors used maturity data, published by Andrews (2013), from different formations to calibrate their TOC models of the Bowland Shale Formation (Late Mississippian-Early Pennsylvanian); the Morridge Formation in Rempstone 1 and the Widmerpool Formation in Old Dalby 1. We contest that this gives viable TOC estimates for the Bowland Shale Formation and that because of the location of the boreholes these TOC models are not representative over the whole of the Widmerpool Gulf. The pyrite content of the mudstones in the Widmerpool Gulf also surpasses the threshold where it becomes an influence on geophysical well logs. Aside from these stratigraphic and lithologic issues, some methodological flaws were not adequately resolved by Kenomore and co-authors. No lithological information is available for the Rock-Eval samples used for the maturity calibration, which because of the interbedded nature of the source formations, has implications for the modelling exercise. We recommend that more geochemical data from a larger array of boreholes covering a wider area, proximal and distal, of the basin are collected before any inferences on TOC are made. This is necessary in the complex Bowland Shale system where lithological changes occur on a centimetre scale and correlations between the different sub basins are not well understood.

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Section: The δLog R (Passey) Methodologymentioning

confidence: 99%

Section: The Rempstone 1 and Old Dalby 1 Boreholesmentioning

confidence: 99%