从岩相古地理论中国南方中下三叠统油气潜景

中下三叠统是中国南方重要的含油气海相碳酸盐岩地层，油气潜力很大，但勘探程度在大部分地区却很低．在定量岩相古地理研究及编图的基础上，对中国南方中下三叠统的烃源岩和储集岩的类型、分布及其与沉积环境的关系，对区域盖层和局部盖层的性质和分布，尤其是对中下三叠统经过多次重大构造变动后所形成的油气保存单元等进行了较深入的研究．指出了５个最有利的油气勘探地区，即绵阳—广元、南充—达县、泸州—重庆、宜昌—沙市、安庆—芜湖地区，以及９个有利的勘探地区和１０个较有利的勘探地区，为我国南方油气勘探打下坚实的基础．

POTENTIAL OF OIL AND GAS OF THE MIDDLE AND LOWER TRIASSIC OF SOUTH CHINA FROM THE VIEWPOINT OF LITHOFACIES PALEOGEOGRAPHY

The Middle and Lower Triassic are 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 breakthroughs of oil and gas exploration have been made in South China. In this paper, on the basis of quantitative study and mapping of lithofacies paleogeography, the indepth study was made, including the types, distribution and relation with sedimentary environments of source rocks and reservoir rocks of the Middle and Lower Triassic of the study area, the nature and distribution of regional and local capping beds, and especially the oil and gas preservation units of the Middle and Lower Triassic formed after many times of important tectonic movements. Five of the most favorable areas for oil and gas exploration were delineated out. They are Mianyang-Guangyuan, Nanchong-Daxian, Luzhou-Chongqing, Yichang-Shashi and Anqing-Wuhu areas. Overmore, there are nine favorable areas and ten relatively favorable areas for oil and gas exploration delineated out. A great breakthrough of oil and gas exploration in the Middle and Lower Triassic and all other marine carbonate strata in South China will be made in the near future.