In this case to calculate the initial gas in the reservoir, use the method of "material balance", however, this method applies "only for the entire site," for gas migration a part of the site to other sites both volumetric (for gas expansion) and those with hydraulic thrust. The material balance method can be used also to estimate the area of \u200b\u200bthe reservoir, the ultimate recovery is expected and the effects the entry of water into the reservoir.
MATERIAL BALANCE EQUATION FOR GAS FIELDS WITHOUT INLET
.
Applying the principle of conservation of matter gas fields, is
states:
Establishing the same balance in terms of moles of gas, we have:
Combining this last equation Real Gas Equation, replacing the moles of gas in terms of n (T, P, Z, R):
Gp Solving the above equation. 
Pcs To set values \u200b\u200band TCS, and considering that Pi, Zi and Vi are fixed,
the equation can be transformed into:
CHART P / Z vs. Gp 
Another form of the EBM (As STRAIGHT LINE METHOD) 
Substituting GpBg WpBw = F + Bg - BGI = Eg , we get:
GRAPHIC (F / Eg) vs (We / Eg) . DEPOSIT WITH INFLUX OF WATER 
Bibliography: Da Silva, Angel. "Balance of Materials in Gas Reservoirs", Class 6 Reservoir Engineering II, UCV.
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