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LOW‐RANK SEQUENCES AND SCALES OF ORGANIC METAMORPHISM
Author(s) -
Suggate R. P.
Publication year - 1982
Publication title -
journal of petroleum geology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.725
H-Index - 42
eISSN - 1747-5457
pISSN - 0141-6421
DOI - 10.1111/j.1747-5457.1982.tb00549.x
Subject(s) - metamorphism , rank (graph theory) , geology , coal , sedimentary rock , ranking (information retrieval) , petroleum exploration , petroleum , mining engineering , petroleum engineering , geochemistry , paleontology , mathematics , archaeology , geography , computer science , combinatorics , machine learning
Degrees of alteration of carbonaceous material, when compared with scales of organic metamorphism, are used mainly by petroleum geologists for estimating conditions of development of sedimentary basins and for estimating the likelihood of oil and gas generation having taken place. For accurate estimation, especially of geological history, the scales need to be correctly designed, and low‐rank sequences (lignite, sub‐bituminous and high‐volatile bituminous ranks of coal) are critical for this. Scales need review, and data from surface and drillhole sequences in New Zealand are valuable for this. The generally‐accepted influence of time is considered unproved and unlikely to be significant. In order to relate the concept of “rank” to the geological conditions, it is necessary to use more than one parameter, and the best for use with low‐rank sequences are the dry‐basis calorific value and the bed moisture. Correlation of degrees of metamorphism with particular geological histories is not possible for high‐rank sequences.