The royalty applies to existing production and future development from the Marcellus formation as well as future potential development from the Utica and Upper Devonian
The two separate transactions are effective as of March 1, 2019 and apply to existing and future Marcellus, Utica and Upper Devonian
development on the subject leases, while excluding shallower and deeper horizons.
Strontium distribution in Upper Devonian
conodont elements: a palaeobiological proxy.
Southwestern Energy has over 475,000 acres in the Appalachia Basin prospective for Upper and Lower Marcellus, Upper Devonian
and Utica/Upper Point Pleasant development.
"The stones are between 354 and 417 million years old and are traced back to the Upper Devonian
Both the mudstone and limestone of Upper Devonian
deposited in the interplatform basin and foreslope could be the potential cap rock.
An Upper Devonian
shale sequence and a Lower Carboniferous carbonate sequence have been encountered in western Iraq.
The Upper Devonian
sediments are dominated by clay and sand, mostly represented by dark shales, calcareous siltstones and sandstones.
31, there were 199 Marcellus wells and 20 Upper Devonian
wells serviced by the gathering system with an average volume of 410 MMcf/d.
The contract has been signed for Southwestern Energy to acquire certain oil and gas assets covering around 413,000 net acres in West Virginia and southwest Pennsylvania, targeting natural gas, natural gas liquids and crude oil contained in the Upper Devonian
, Marcellus and Utica shales.
Considering that the Devonian-Carboniferous boundary is placed at 359 million years ago, and that deformation affecting similar rocks in the Frontal Cordillera has been dated in the Late Devonian-early Carboniferous (Heredia et al., 2012) and the metamorphism in Middle-Late Devonian (Wilner et al., 2011), the age of these rocks can be established as Upper Devonian
The Birdbear Formation of the Williston Basin in southwestern North Dakota, represents one carbonate transgressive-regressive cycle during the Upper Devonian
. The Birdbear is conformable with the Duperow Formation below and the Three Forks Formation above.