This dataset represents the cradle-to-gate inventory of the product. The dataset includes both thickened oil and unthickened oil onshore production. In China, thickened oil accounts for 10% and unthickened oil accounts for 90% of petroleum production. This dataset can represent the average production mix in China. thickened oil reservoirs refer to reservoirs where the viscosity of the stored petroleum is greater than 50 mPas under reservoir conditions. thickened oil reservoirs have high viscosity and poor mobility, making them difficult to exploit; low-permeability oil fields have low permeability and low abundance of oil reservoir storage layers and low production capacity per well. The net calorific value of petroleum is 43.4 MJ/kg, and the average calorific value of natural gas is 36 MJ/Sm3.