Drilling technology for low permeability reservoir Fracturing technology for ultra-low permeability reservoirs 并列题名：Fracturing technology for ultra-low permeability reservoirs Ground engineering technology for ultra-low permeability reservoirs 并列题名：Ground engineering technology for ultra-low permeability reservoirs CO2 flooding technology in low rermeability sandstone reservoir Drilling & compeltion tools and equipment for low permeability reservoir Well-logging evaluation technology for low porosity and permeability reservoirs Well Completion and reservoir stimulation technology for low permeability reservoir Efficient development theory and technology in ultra-low permeability reservoir