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Part III Case Studies |
Department of Geology, Queens University, Belfast BT7 1NN, UK
The Lower Carboniferous Oil Shale Group includes lacustrine rocks with petroleum source-rock potential. Existing data is reviewed, and new pyrolysis data is presented which shows that the oil shales sensu stricto are excellent source rocks with up to 30% TOC and yields of up to 180 mg/g. Other shales and dark limestones in the group also have some source-rock potential. The oil shales contain mixtures of laminar algal matter (lamalginite) and discrete algal bodies (telalginite) which represent planktonic and benthonic algal deposits. The algal bodies are Botryococcus-type and referable to Pila. There is a general correlation between % alginite and hydrocarbon yield.
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H. I. Petersen and H. P. Nytoft Assessment of the petroleum generation potential of Lower Carboniferous coals, North Sea: evidence for inherently gas-pronesource rocks Petroleum Geoscience, 2007; 13: 271 - 285. [Abstract] [Full Text] [PDF] |
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