Main Types,Geological Features and Resource Potential of Tight Sandstone Gas in China

Tight sandstone gas has become a focus of the global unconventional natural gas exploration.It is widely distributed in China.Until recently,Ordos and Sichuan basins have achieved the large-scale exploitation.Tight sandstone gas in China has mainly three types,including slop type,structure type and depression type.The tight sandstone reservoirs are mainly sourced by coal-measure rocks,and charged continually.The widespread source rocks and reservoirs interbed.Therefore,the gas can migrate vertically from source to adjacent reservoir.The intimate contact of source and reservoir forms the large-scale gas-bearing area,with"sweet spots" locally enrichment.The favorable exploration area of tight sand gas in China is 3.2×105 km2,with recoverable resources about(8～11)×1012m3.Currently,China has comparatively mature technology of the exploration and development of tight sandstone gas,having the conditions of accelerating the developing pace.Therefore,tight sandstone gas will play an important role in the future natural gas development in China.