Reserve-production ratio and reserve replacement rate are important indicators for measuring the sustainable development of oil and gas companies. The reserve-production ratio of Sinopec natural gas has increased year by year, however, the overall annual increase in economically recoverable reserves has declined, and the reserve replacement rate in 2016 was less than 100%. Among them, low-permeability sandstone gas reservoirs and carbonate gas reservoirs are the main gas fields. However, as exploration difficulties increase, high-quality undeveloped resources are reduced, achieving sustainable long-term natural gas development faces challenges. According to the current situation, some suggestions for increasing economically recoverable reserves and reserve-production ratio are proposed. First, strengthen the exploration planning of marine carbonate gas reservoirs, and actively expand new zones and new strata; second, strengthen policy support and institutional reforms of tight gas reservoirs, and increase the utilization of reserves; third, strenghen the research on the utilization limit and evaluation method of unused reserves, and actively promote block transfer; finally, pay attention to the management and adjustment of old districts to maximize recovery.