Accounting for adsorbed gas-in-place for shale gas plays

The flowing material balance (FMB) analysis provides the capability to account for adsorbed gas-in-place (GIP) for shale gas plays.

In the Material Balance Options section, select Adsorption. This corrects the data to include adsorbed gas, and shifts the data points up.

Note:   When the Adsorption checkbox is selected, and after you have opened an FMB analysis, your Langmuir Volume (V_LS) and Pressure (P_LS) values are used. (You need to enter values for the Langmuir Volume (V_LS) and Pressure (P_LS) in the Properties editor (under Formation / Rock, Adsorption.)

Reposition the analysis line through the data points. The calculated OGIP now includes an adsorbed volume (OGIP_A).