摘要：Shale gas has become one of the hot spots of energy research in the world.The marine shale in the upper-middle Yangtze area of southern Sichuan has always been an important field of shale gas research in China.As a new unconventional energy source,the geological surveys have revealed that the marine shale in the upper-middle Yangtze area of southern Sichuan has a large amount of shale gas resources.On the basis of analyzing the characteristics of Longmaxi Formation reservoirs,this paper predicts and evaluates the Longmaxi Formation shale gas in southern my country based on the analytic hierarchy process.The following conclusions are drawn from this study: All high-quality reservoirs in the Longmaxi Formation are deposited in semi-deep to deep-sea sedimentary areas,with high organic carbon content and well-developed reservoir spatial characteristics,which allows the formation of a good closure sequence,deposition environment,and pore structure.Structural style and reservoir overpressure are the main controlling factors affecting natural gas enrichment.The enrichment method of the Longmaxi Formation in the Middle Yangtze area is closely related to the reservoir characteristics.The Longmaxi Formation is a neritic deposit related to the source rock development conditions.The analytic hierarchy process establishes a fuzzy comprehensive scoring system,calculates the membership degree of comments in each block,and covers the results of multi-regional surveys.The Longmaxi Formation is the highest in Fuling and southern Sichuan,followed by eastern Henan and Central Yangtze.
