关键词: 二叠系, 定量, 岩相古地理, 烃源岩, 储集岩, 区域盖层, 油气保存单元

Abstract: The Permian is the important marine carbonate strata bearing oil and gas in south China.Its potential of oil and gas is very large, but little exploration was done.Except the Sichuan basin, no important brcakthroughs of oil and gas exploration have been made in marine carbonate strata in south China.On the basis of quantitative study and mapping of lithofacies paleogeography, the indepth study was made on the types, distribution and relation with sedimentary environments of source rocks and reservoir rocks of the Permian of the area, on the nature and distribution of regional and local capping beds, and especially on the oil and gas preservation units of the Permian formed alter many times of important tectonic movements.Five most favourable areas for oil and gas exploration were delineated out.They arc the Sichuan basin and Jianghan basin for oil and gas pools of concealed reefs as well as oil and gas pools of dolostones related with reefs and banks, the Yunnan-Guizhou area for coal bed gas, the Nanpanjiang area for isolated carbonate platforms in the deep water basin, the Shiwandashan basin areas with good preservation conditions, and the broad conjunction zone between the Jiangnan platform and basin.We hope that great breakthroughs of oil and gas exploration in the Permian and all other marine carbonate strata of south China will be made in the near future.

Key words: Permian, quantitative, lithofacies paleogeography, hydrocarbon source rocks, reservoir rocks, regional capping beds, oil-gas preservation units