A COMPARATIVE STUDY OF PALEOGENE LACUSTRINE MICROFOSSILS AMONG PEARL RIVER MOUTH BASIN, BEIBUWAN BASIN AND BOHAI GULF BASIN
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Abstract:
Microfossils from Paleogene lacustrine oil source rocks of the Pearl River Mouth Basin, Beibuwan Basin and Bohai Gulf Basin have been studied. The Paleogene lacustrine microfossils of Bohai Gulf Basin are characterized by their high abundances, high diversities, high proportion of local species as well as saline species and the occurrence of talassogenous fauna. In Beibuwan Basin, only ostracods,gastropods and charophytes are discovered in the Weizhou Formation and Liushagang Formation; microfossils are rare in the Paleogene lacustrine sediments and only shell debris were found in some samples. According to the characteristics of microfossils of the three basins, we speculated that the Bohai Gulf Basin was a hydrologically closed lake during Paleogene and in some periods it was a saline lake rich in Na and Cl. The Paleogene lacustrine oil source rocks of Pear River Mouth Basin were deposited in a freshwater lake with lower salinity, hardness and pH. The Paleogene lake of Beibuwan Basin was a freshwater lake too, but with higher salinity.
