BGS total organic carbon

Total organic carbon data coverage
Scale N/A
Coverage Great Britain
Format Excel spreadsheet or GIS point data (ESRI, MapInfo, others available by request
Price On request. Subject to number of users, licence fee and data preparation fee.
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BGS total organic carbon (TOC) is a measure of the dry weight per cent of organic carbon within hydrocarbon source rocks. Hydrocarbons, including natural gas (principally methane, ethane and propane), may be generated by the heating of organic carbon through burial over geological time.

A shale with low concentrations of organic carbon (typically below about two per cent) probably won't have the capacity to produce oil or gas in useful quantities. It should also be noted that a high TOC value is not necessarily an indicator of shale gas potential. The gas prospectivity of a rock is heavily influenced by the kerogen types within the organic matter — including that derived from plankton, algae, spores, pollen or plant fragments. These can affect gas production, rock porosity and the rates at which gas may be released.

The total organic carbon dataset is available as a Microsoft Excel spreadsheet or as points in GIS format.

 

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Hutton field: well correlation diagram.