More recently, it has been realized that these color changes can be related to the degree ofmaturation of the associated kerogen. Several color codes are used by palynologists; somehave been developed by palynologists themselves, others are borrowed from brewers. Onepopular system is the 10-point Spore Color Index of Barnard et al. (1978); another is the5-point Thermal Alteration Index of Staplin (1969). Using the simple brewer’s color code,the following relationship between pollen color and hydrocarbon generation has been noted:water: immature; lager: oil generation; bitter: condensate generation; Guinness: dry gas. It hasbeen argued that pollen color measurement is a subjective assessment, but with referencestandards and adequate operator experience, the results seem to be valid. The technique isrelatively fast and economical, since the palynologists will review their samples as a routinecheck for contamination and recycling anyway.
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