Abstract: Abstract:Greenhouse gas(GHG) emissions from the process of natural gas development is an important emission source in the fossil energy system. Research on greenhouse gas emissions from the oil and gas system is still in its infancy in developing countries such as China. As a major gas producer, the Sichuan Basin was investigated. A large-scale representative gas field with 160 million m³ was selected to study GHG emissions in the exploration and development of natural gas. Each potential gas leak point among all the components at the stations, such as wellhead, gas gathering station and gas distributing station, was monitored by CH₄ concentration detector. In addition, the GHG emissions from gas field water storage in open air water pools and torching were simulated in the laboratory. Combining the simulated and field-measured data, the emissions were precisely calculated in the study area in 2011. The results showed that CH₄ and CO₂ emissions were 1,3.32 t and 1,5.56 t in the study area in 2011, converted to an equivalent of CO₂ of 27,8.56 t. As compared with results determined by the first-level method of the Intergovernmental Panel on Climate Change (IPCC) (20,7.39 t of CH₄ and 12,9.74 t of CO₂, converted to equivalent of CO₂ of 519,4.74 t), the IPCC's result is much higher than the results of field measurement.