Abstract
Shale gas reserves is enormously abundant in the world and has considerable prospects for exploration. Therefore, how to accurately calculate the dynamic reserves of shale gas reservoirs is very important. In recent years, scholars have proposed a variety of material balance equations for shale gas reservoirs to calculate dynamic reserves. However, only parts of factors were considered. Based on previous research, a new dual-porosity media material balance equation is established to more accurately calculate the dynamic reserves of gas reservoirs. In the new material balance equation, the critical desorption pressure, the adsorbed phase porosity, the change in the volume of the adsorbed phase, the dissolved gas in kerogen and water are all taken into consideration. The rock compressibility is revised as well. The cases analysis show that different factors exert a certain influence on the calculation results of reserves. Therefore, to effectively predict the dynamic reserves and guide the exploitation of shale gas reservoirs, all factors should be comprehensively considered to establish the correct material equilibrium equation.
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