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Abstract
Residual gas saturation of core samples from T gas reservoir was determined by unidirectional spontaneous imbibitions experiments and the fitting formula for residual gas saturation calculation using initial gas saturation has been established. The residual gas saturation lies between 3.8% and 55%, which increases slightly with the increase of porosity and permeability. The experimental results are coincident with the calculations from Land's (1968) empirical formula; moreover, it agrees with the results from Agarwal's (1967) empirical formula at relatively low residual gas saturation, but as the residual gas saturation increases, the results given by Agarwal's model tend to be overestimated.
NOMENCLATURE
| Swi | = | = original water saturation |
| Sgi | = | = initial gas saturation |
| Sgr | = | = residual gas saturation |
| Sgrm | = | = maximum residual gas saturation |