Natural gas and oil production from the United States’s seven most prolific onshore unconventional plays, which began an upward swing 21 months ago, will continue that trend in September, according to the U.S. Energy Information Administration (EIA).

Total gas production in September for the seven key regions — the Anadarko, Appalachian and Permian basins, and the Bakken, Eagle Ford, Haynesville and Niobrara formations — is expected to reach 72.42 Bcf/d, compared to 71.41 Bcf/d in August, according to EIA’s latest Drilling Productivity Report (DPR), which was released Monday. Total oil production from the same plays will increase to 7.52 million b/d from 7.43 million b/d in July.

The steady increases out of the plays began in January 2017, when total gas production out of the seven regions was estimated at 47.51 Bcf/d, and total oil production was an estimated 4.54 million b/d.

All seven plays are expected to see increased natural gas production in September compared to August, with the Appalachian Basin, home to the mighty Marcellus and Utica shales, continuing to lead the way with an estimated 29.35 Bcf/d from 29.05 Bcf/d in August, EIA said.

Increases are also expected in the Anadarko (7.22 Bcf/d from 7.12 Bcf/d), Bakken (2.46 Bcf/d from 2.44 Bcf/d), Eagle Ford (7.06 Bcf/d from 6.93 Bcf/d), Haynesville (9.58 Bcf/d from 9.43 Bcf/d), Niobrara (5.21 Bcf/d from 5.15 Bcf/d) and Permian (11.54 Bcf/d from 11.30 Bcf/d).

Total oil production in the seven plays is expected to increase nearly across the board again as well, with much of the increase to come from the Permian, which is forecast to reach 3.42 million b/d, compared to 3.39 million b/d in July.

Increases are expected in five other plays, with the Anadarko estimated at 558,000 b/d, Appalachia at 123,000 b/d, Bakken at 1.31 million b/d, Eagle Ford at 1.45 million b/d and Niobrara at 615,000 b/d. The Haynesville (43,000 b/d) is forecast to see oil production remain unchanged month/month.

Drilled but uncompleted (DUC) well counts across the Big Seven ended July at 8,033, an increase of 165 from June, EIA said.

The bulk of the DUCs were in the Permian, which saw an increase of 167 in July to 3,470, and in the Eagle Ford, which increased 32 to 1,512. Two Big Seven plays saw their DUC numbers decrease from June: Appalachia (minus 5) and the Niobrara (minus 40).

The productivity of new oil wells in the Big Seven plays is expected to decrease in September to 649 b/d, according to the DPR. New-well gas production per rig is expected to decrease marginally during the month to 3.75 MMcf/d.

EIA compiles the DPR using recent U.S. data on the total number of drilling rigs in operation along with estimates of drilling productivity and estimated changes in output from existing wells to provide estimated changes in production.