Abstract: The gas in Es³⁽⁴⁾below the salt sequence has single source in Wenliu area of Dongpu depression,and the boundary condition is clear for the source rocks in the CarboniferousPermian coalbearing sequence.Exploration degree is high in this area.Final proven reserves can be calculated accordingly by profound understand of natural gas reservoir formation condition,reservoir formation history and gas reservoir features.The quantity of gas generated from coal measure in the reference section can be calculated by the method of basin modeling,and natural gas accumulation coefficient is calculated as 7.3%-7.6%.