Geochemical characteristics of oligocene coal and coaly mudstones in Blocks 06, 07 and 12, Nam Con Son basin
Abstract
Oligocene coal and coaly shales in blocks 06, 07 and 12 in the Nam Con Son basin are main hydrocarbon source rocks. Total organic carbon content varies from 4.9wt.% to 69.11wt.% on average. The remaining generation potential (S2) is from 6,39mg/g to 183,6mg/g; and the hydrogen index of most coal and coaly shales is more than 200mg/g. Kerogen is mainly type III (vitrinite maceral) and mixture of type III and II (vitrinite and liptinite maceral generated from resin, wax and spores of higher land plant). In the central trough of the Nam Con Son basin (block 06), organic matter is currently in dry gas stage; while in blocks 07 and 12, organic matter is in the early stage of hydrocarbon generation. Many geochemical characteristics of oil and Oligocene coal and coal shales from well 07-CRD-1X are similar.
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