gas-cap drive
the drive due to the expansion of a pocket of free gas (gas cap) in the highest part of the reservoir rock
GRM: n.
Note: this production mechanism is regarded as a more efficient type of depletion drive
References:
GEN drive
SEE solution gas drive
SEE solution-gas drive
SEE depletion drive
SEE dissolved gas drive
SEE dissolved-gas drive

ENERGY TERM COURTESY OF ENERGY.EU