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- W4256271639 abstract "Abstract Coals from oil and gas wells in the Gippsland Basin (Victoria, Australia) and in the Taranaki Basin (New Zealand) range up to high-volatile bituminous in rank and exhibit a wide range of coal type. Original depths of burial are estimated at up to 5000 m (17 000 ft); temperatures are estimated to have ranged up to 160°c (320°f). The temperature gradients in the two basins and in the different parts of the Gippsland basin vary widely, being lowest where subsidence has been fastest. The calorific value of the dry coal and the moisture content, which for purposes of comparison need to be adjusted to the “average-type” basis, are independent of each other. The moisture contents are principally affected by depth (pressure), and the calorific values (which are a measure of the metamorphism of the dry coal substance) by the temperature. Because systematic relations are shown to exist between depths, temperatures, and coal analyses in these almost undeformed basins, the relations can be used to provide indications of past maximum depths and temperatures from the analyses of coals now found in basins that have been deformed and eroded. Corollaries to the systematic relations are: (1) it is necessary to use both calorific value of dry coal and moisture content in classifying coals with dry calorific values of up to 8600 kcal/kg and/or moisture contents of more than 2%; (2) because two such independent parameters are lacking for higher rank coals, temperatures and depths of burial for these coals cannot be inferred; (3) in correlating coal analyses with the occurrence of oil and gas, both moisture content and an analytical determination related to the dry coal (e.g., calorific value) need to be used, rather than a single analytical parameter as in the carbon ratio theory." @default.
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- W4256271639 date "1974-01-01" @default.
- W4256271639 modified "2023-09-28" @default.
- W4256271639 title "Coal ranks in relation to depth and temperature in Australian and New Zealand oil and gas wells" @default.
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- W4256271639 doi "https://doi.org/10.1080/00288306.1974.10428482" @default.
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