This excerpt taken from the CHK 8-K filed Feb 15, 2008.
Unconventional Gas Resource Plays– From its unconventional gas resource plays, the company is producing approximately 1.1 bcfe net per day. In these plays, the company is currently using 96 operated drilling rigs to further develop its inventory of 3.6 million net acres. Chesapeake’s proved developed reserves in unconventional gas resource plays are 3.0 tcfe, its proved undeveloped reserves are 2.4 tcfe and assuming 21,400 net wells are drilled in the years ahead, its estimated risked unproved reserves are 22.8 tcfe (45.2 tcfe of unrisked unproved reserves). Six of Chesapeake’s most important unconventional gas resource plays are described below: