Abstract
FORTY samples of coal from oil-prospecting wells drilled by Shell BP Todd Oil Services, Ltd., in the Taranaki area of New Zealand have been analysed at the Chemistry Division of the New Zealand Department of Scientific and Industrial Research. Full analytical details and a discussion of the depth/rank relation are given by us1, and we emphasize that direct comparison of the analyses is not satisfactory because the coal types and sulphur contents vary widely. It was necessary to make some allowance for these variations, the method used being that of Suggate2. Within the high-volatile bituminous range of rank penetrated in the wells, the most satisfactory parameter of rank is the calorific value.
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References
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SUGGATE, R., ELPHICK, J. Coal Ranks and Geothermal Gradients in High-volatile Bituminous Coalfields. Nature 203, 72 (1964). https://doi.org/10.1038/203072a0
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DOI: https://doi.org/10.1038/203072a0
