This hybrid technology combines water injection and gas injection methods. In China, the technology mix for crude oil production is 80% water injection and 20% gas injection, and this dataset represents the average production mix in China. Water injection: As an important method for enhancing oil recovery, water injection involves injecting water or other fluids into the reservoir to increase formation pressure and drive crude oil toward the wellbore. Gas injection: A reservoir process used to improve crude oil recovery by injecting a working agent (natural gas or air) into the reservoir through a series of injection wells, thereby displacing residue oil into surrounding production wells. A low-permeability oilfield refers to an oilfield with low reservoir permeability, low abundance, and low single-well productivity.