This dataset represents the from-cradle-to-gate inventory of a product. This dataset includes both water injection and gas injection multi-technology, with water injection accounting for 80% and gas injection for 20% of the petroleum production technology in China. Therefore, this dataset can represent the average production mix in China. Water injection multi-technology: An important method to enhance oil recovery, water injection increases formation pressure and pushes petroleum towards the wellhead by injecting water or other fluids into the oil layer. Gas injection multi-technology: The process of reservoir gas injection technology to enhance petroleum recovery. A series of injection wells are used to inject working fluids (natural gas or air) into the reservoir to displace residual petroleum into the surrounding production wells. Low-permeability oil fields refer to those with low permeability, low abundance, and low single-well production capacity in the oil layer reservoir. The net calorific value of petroleum is 43.4MJ/kg, and the average calorific value of natural gas is 36MJ/Sm3.