This excerpt taken from the CHK 8-K filed Feb 15, 2008.
Emerging Unconventional Gas Resource Plays– In its emerging unconventional gas resource plays, commercial production has only recently been established (generally in not meaningful amounts), but the company believes future reserve potential could be substantial. In these plays, Chesapeake is currently using 11 operated drilling rigs to further develop its inventory of 2.0 million net acres. Chesapeake’s proved developed reserves in emerging unconventional gas resource plays are 62 bcfe, its proved undeveloped reserves are 10 bcfe and assuming an additional 1,050 net wells are drilled in the years ahead, its estimated risked unproved reserves are 2.3 tcfe (22.0 tcfe of unrisked unproved reserves). Four of Chesapeake’s most important emerging unconventional gas resource plays are described below: