关键词: 扬子地台, 寒武系, 志留系, 页岩气, 资源量

Abstract: Yangtze Platform is the main oil and gas producing region in South China, where shale gas is abundant. There are four sets of black carbonaceous shale in the region, of which Qiongzhusi Formation (Niutitang Formation) in the lower section of Cambrian System and Longmaxi Formation of Silurian System of Lower Paleozoic are widely distributed with a large thickness, a high content of TOC and an appropriate Ro value. The prospective and technically recoverable reserve of shale gas is enormously considerable. Longmaxi Formation is distributed in five black shale basins along the Yangtze River – Yibin, Fuling, Yueyang, Xuancheng and Jurong. The thickness is higher than 100 meters and TOC more than 2 percent. Qiongzhusi Formation is distributed in three north-east echelon basins south of the Yangtze River – Sichuan-Yunnan, Hunan- Guizhou and Southern Anhui. The thickness is higher than 120 meters and TOC more than 2 percent. The shale horizons of Qiongzhusi Formation and Longmaxi Formation in China can match up to the shale horizons in the United States in terms of various indexes, but the Ro value of China’s shale horizons is slightly higher. Those two horizons are estimated to have shale gas resources of (417.44-423.97) ×1012m3 and recoverable resources of 13×1012m3, indicating that the Yangtze region is rich in shale gas resources. However, the geological structure and geographic environment are very complicated in this region, with a high density of population. The US experiences can be duplicated in the efforts for exploration and development. Exploration and development should be focused on Sichuan Basin and then gradually expanded outwardly, following China’s own shale gas exploration and development style and constructing the shale gas bases to support the Yangtze Economic Belt.