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

Total organic carbon evaluation of the Bowland Shale Formation in the Upper Bowland of the Widmerpool Gulf
Total organic carbon evaluation of the Bowland Shale Formation in the Upper Bowland of the Widmerpool Gulf
Widmerpool Gulf is one of the basins in the carboniferous Bowland Hodder shale in Central Britain. The area of interest in the Widmerpool Gulf is the Bowland Shale Formation within the Upper Bowland. This paper focuses on evaluating the total organic carbon (TOC) from Rempstone 1 and Old Dalby 1 both penetrating the Bowland Shale Formation using Passey’s delta Log R method. TOC is an essential property needed to have a productive shale gas play - accurate characterisation of TOC is critical in evaluating the potential of shale gas reservoirs because it closely relates to the amount of kerogen and therefore total gas content. Passey’s method involves the use of well logs to obtain the organic richness i.e. TOC. It relies on the response of well logs to organic matter using an overlay of porosity logs and resistivity logs. Which causes a separation i.e. a delta Log R separation. The reasons for the delta Log R separation in an organic rich reservoir/non reservoir rocks is due to the presence of low density, high transit time kerogen and the presence of formation fluid i.e. oil, gas or water. Immature source rocks also observe a separation but only from the porosity log whilst non source rocks observe no separation. Rempstone 1 and Old Dalby 1 well logs were exported on Interactive Petrophysics to analyse the lithology of the intervals before been exported to Microsoft Excel to evaluate the parameters of Passey’s equation to enable TOC determination. TOC estimates for the Upper Bowland Shale section in the Widmerpool Gulf and was found comparable to estimates obtained from British Geological Survey (BGS) RockEval core analysis report. This method proved to be a suitable way of estimating the total organic carbon using simple well logs.
0920-4105
137-145
Kenomore, Michael
94a249af-8730-4253-99a2-1cbccbe8ed31
Hassan, Mohamed
ce323212-f178-4d72-85cf-23cd30605cd8
Dhakal, Hom
ed7c4499-110b-4203-b5e7-a2386a1c3214
Shah, Amjad
acbfbb5c-fe5d-4703-8f1b-2397f18e80d8
Kenomore, Michael
94a249af-8730-4253-99a2-1cbccbe8ed31
Hassan, Mohamed
ce323212-f178-4d72-85cf-23cd30605cd8
Dhakal, Hom
ed7c4499-110b-4203-b5e7-a2386a1c3214
Shah, Amjad
acbfbb5c-fe5d-4703-8f1b-2397f18e80d8

Kenomore, Michael, Hassan, Mohamed, Dhakal, Hom and Shah, Amjad (2017) Total organic carbon evaluation of the Bowland Shale Formation in the Upper Bowland of the Widmerpool Gulf. Journal of Petroleum Science and Engineering, 150, 137-145. (doi:10.1016/j.petrol.2016.11.040).

Record type: Article

Abstract

Widmerpool Gulf is one of the basins in the carboniferous Bowland Hodder shale in Central Britain. The area of interest in the Widmerpool Gulf is the Bowland Shale Formation within the Upper Bowland. This paper focuses on evaluating the total organic carbon (TOC) from Rempstone 1 and Old Dalby 1 both penetrating the Bowland Shale Formation using Passey’s delta Log R method. TOC is an essential property needed to have a productive shale gas play - accurate characterisation of TOC is critical in evaluating the potential of shale gas reservoirs because it closely relates to the amount of kerogen and therefore total gas content. Passey’s method involves the use of well logs to obtain the organic richness i.e. TOC. It relies on the response of well logs to organic matter using an overlay of porosity logs and resistivity logs. Which causes a separation i.e. a delta Log R separation. The reasons for the delta Log R separation in an organic rich reservoir/non reservoir rocks is due to the presence of low density, high transit time kerogen and the presence of formation fluid i.e. oil, gas or water. Immature source rocks also observe a separation but only from the porosity log whilst non source rocks observe no separation. Rempstone 1 and Old Dalby 1 well logs were exported on Interactive Petrophysics to analyse the lithology of the intervals before been exported to Microsoft Excel to evaluate the parameters of Passey’s equation to enable TOC determination. TOC estimates for the Upper Bowland Shale section in the Widmerpool Gulf and was found comparable to estimates obtained from British Geological Survey (BGS) RockEval core analysis report. This method proved to be a suitable way of estimating the total organic carbon using simple well logs.

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More information

Accepted/In Press date: 30 November 2016
e-pub ahead of print date: 6 December 2016
Published date: 1 February 2017

Identifiers

Local EPrints ID: 438234
URI: http://eprints.soton.ac.uk/id/eprint/438234
ISSN: 0920-4105
PURE UUID: 12d30e12-f1cb-4410-908c-624c53185018
ORCID for Mohamed Hassan: ORCID iD orcid.org/0000-0003-3729-4543

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Date deposited: 04 Mar 2020 17:31
Last modified: 07 Oct 2020 02:27

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Contributors

Author: Michael Kenomore
Author: Mohamed Hassan ORCID iD
Author: Hom Dhakal
Author: Amjad Shah

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