Characterisation and distribution of hydrocarbon in Song Hong basin
Abstract
Compared to other Tertiary basins of Vietnam, the Song Hong basin is less prolific. The density of oil and gas discoveries is therefore not sufficient for detailed geochemical characterisation of the petroleum in the entire basin. However, based on the available data the authors have analysed the geochemical characteristics of hydrocarbons (HC) and source rocks in the study area and got the following results:
• There are four HC groups that could be recognised in the Song Hong basin: Hydrocarbon with mainly terrestrial sources from blocks 102 and 103 (Miocene inversion zone); Hydrocarbon with mainly lacustrine sources from blocks 106 and 107 and well B10 STB-1X (NE Song Lo differential zone and Bach Long Vi zone); Hydrocarbon with mainly terrestrial sources from block 112 (Hue Da Nang sub-basin); Hydrocarbon from blocks 118 and 119 and migrated HC from block 120 (Tri Ton horst) and HC from block 113 (central sub-trough);
• The distribution of HC and source rock samples on the diagrams demonstrates the close relationship between oil and source rock on the same structural element in the basin;
• It is possible that the migration distance of HC in the Song Hong basin is not long;
• The distribution of HC suite in the structures in the Song Hong basin is to be studied in further research.
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