阜新盆地非常规天然气资源类型与成藏分布序列OA

As a coal bearing basin formed in late Jurassic-early Cretaceous,Fuxin Basin contains gas in coalbeds,shale,tight sandstone and conventional reservoirs.However,except for Dongliang structural belt in the basin,no breakthrough in oil and gas exploration has been achieved in other areas.Therefore,starting from geological condi-tions,reservoir characteristics,accumulation patterns and natural gas reservoirs classification and distribution char-acteristics of Fuxin Basin,unconventional natural gas reservoirs in the basin are taken as object to study interactive combination relationship and distribution among them.The results show that,the structural-sedimentary conditions in Fuxin Basin lead to a different natural gas distribution sequence from that in the ideal model.Vertically,different types of natural gas is mainly enriched in Shahai Formation and Jiufotang Formation,showing a distribution se-quence of the accumulation of coalbed methane or shale gas-tight sandstone gas-conventional gas reservoirs.Areal-ly,shale deposits in the subsidence center,which determines that shale gas is the main focus in central area of the basin,while tight sandstone gas and conventional gas are attached to shale gas or coalbed methane,making coal-bed methane and tight sandstone gas the main focus at the edge of the basin.The research provides a theoretical ba-sis for the research and development of natural gas reservoirs in coal strata.