| Popis: |
Hydrocarbon stored in Precambrian rocks is widespread in China. Hydrocarbon-bearing units are mainly associated with metamorphic and carbonate rocks of Archean and Middle-Late Proterozoic (including Sinian) age. Reservoirs are characterized by secondary porosity associated with karstification, fracturing, buried dissolution, and buried recrystallization. Hydrocarbon originated from both Phanerozoic and Precambrian source rocks, so descendant and indigenous hydrocarbon accumulation can be categorized by relation of source to reservoir rock. By volume, descendant hydrocarbon dominates. |
