This dataset represents the cradle-to-gate inventory of a product. The dataset includes multi-technology involving waterflooding and gas injection, with waterflooding accounting for 80% and gas injection 20% in petroleum production technology in China. Therefore, this dataset can represent the average production mix in China. Waterflooding technology: As an important means to increase oilfield recovery, waterflooding increases formation pressure and pushes petroleum towards the wellhead by injecting water or other fluids into the oil layer. Gas Injection technology: A process of Enhanced Oil Recovery (EOR) that improves petroleum recovery by injecting gas into the reservoir. A series of injection wells are used to inject working fluids (natural gas or air) into the reservoir to drive the 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 stratum reservoir. The net calorific value of petroleum is 43.4 MJ/kg, and the average calorific value of natural gas is 36 MJ/Sm3.