Abstract:

Cambrian carbonate rocks in Tongreni-Fenghuang-Sandu-Danzhai regionbelongs to front slope facies of platform, and is in optimal position for mer-cury and oil accumulation. The diagenesis of the carbonate rocks include bio-genic agency, cementation, compaction, early-stage dissolution,neomorphsmi,dolomitization, pressure solution, metasomatism and late-stage dissolution.The early-stage dissolution and dolomitization took place in the Devonian-Carboniferous Periods and are favourable for oil accumulation; the latestage dissolution happened in Late Cretaceous and is favourable for mercuryaccumulation.