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Rahul kumar Best Answer
The diagram shows the variation in atomic H/C and atomic O/C ration in different types of organic constituents (Type I, II, III etc.) with maturation. It can be noticed that different macerals (alginite, sporinite, vitrinite, inertinite) have difference atomic H/C and O/C ratio during early maturation period. With increasing maturation (conversion from peat -> lignite -> bituminous -> anthracite), atomic H/C ratio decreases at fastest rate in type 1 (alginite) and with slowest rate in type 4 (inertinite). Once all the macerals cross the bituminous range, they merge together and can not be identified. After bituminous, H/C ratio of all macerals become same. The rate of decrease of H/C ratio is highest in alginite and sporinite, which suggests that they will release abundant methane (CH4) during maturation and will lead to the generation of coal bed methane. You can also refer to the attached diagram for further details.