关键词: 页岩气, 主控因素, 中国南方, 寒武系, 志留系, 页岩气有利区

Abstract: On the basis of the pool-forming theory and conditions for shale gas in the United States,the controlling factors for shale gas accumulation were analyzed and divided into internal and external factors.The internal control factors include the type,content and maturity of organic matters,and the fracture,porosity,permeability,mineral composition,thickness,humidity of shale.The external control factors include reservoir depth,temperature and pressure of formation.Among them,the type,content and maturity of organic matters,as well as the fracture,porosity and permeability of shale are the main factors for generating shale gas reservoir.The favorable areas for developing shale gas reservoirs were predicted by using parameter model.The analogical analysis based on the model suggests that the Cambrian system and the Silurian system are the most favorable strata for developing of shale gas reservoirs among the marine Paleozoic strata in South China.The most favorable areas of the Cambrian are located in Sichuan Basin,the Micangshan-Dabashan foreland,the northern Guizhou Province,West Hunan Province,East Chongqing and the north part of Jiangnan uplift.The most favorable areas of the Silurian are located in Sichuan Basin,the Micangshan-Dabashan foreland and East Chongqing,West Hubei Province of Upper-Yangtze River,North Hubei Province of Middle-Yangtze River and South Jiangsu Province of Lower-Yangtze River.The indexes of shale in the favorable areas were analyzed to provide reference for early evaluation of shale gas in China.

Key words: shale gas, controlling factors, South China, Cambrian system, Silurian system, favorable areas of shale gas