Inorganic gas and its resource in Songliao Basin

Abstract

Four carbon dioxide reservoirs have been discovered in Songliao Basin. Some inorganic hydrocarbon gas was captured in Xujiaweizi area, and helium abnormity was found in several places in the north of Songliao Basin. Helium mainly came from mantle, which indicates that mantle-resource gas exists commonly in the researched area. The formation conditions of gas reservoir and crust-mantle structure in the deep strata show that there are several types of inorganic gas resources in Songliao Basin. The outgas types and amount of different gas resource varied with the different geological conditions and evolution processes. There are four outgas models including the model in which inorganic gas directly overflows from mantle matter through lithospheric fracture, the model of heat flow piercement outgas,the model of volcano-magma outgas, and the model of carbonate rock outgas due to heat metamorphism. The heat flow piercement,magma house in crust and volcanic rock overlap in space. The distribution of inorganic carbon dioxide reservoirs relates to above three gas resources. The outgas models of the heat flow piercement and volcano-magma are the main models of gas resources in Songliao Basin.