Unconventional Oil & Gas

Shale plays first come to mind when one considers unconventional resources. These unconventional resource plays may yield natural gas, gas condensates, and crude oil. Some of the more noteworthy shale plays in North America include the Barnett, Haynesville, Marcellus, Eagle Ford, Fayetteville, Woodford, Bakken, Niobrara, Horn River, and Utica formations. Tight gas, coalbed methane, oil sands, and heavy oil are non-shale unconventional resources.


Eagle Ford | Marcellus | Cline | Permian | Utica | Bakken | Woodbine & Eaglebine

Woodford Shale

Woodford Shale ImageLocated in southeastern Oklahoma, the Woodford shale play has been drilled for about 10 years. Only the Barnett shale in Texas has been producing natural gas longer than the Woodford shale. Devon Energy drilled the first well into the Woodford shale formation in 2005, and since then numerous petroleum companies have acquired acreage and launched their own drilling programs. Current estimates are that the Woodford shale holds approximately 4 tcf of natural gas.

Of the numerous companies drilling in the Woodford shale, Houston-based Newfield Exploration and Oklahoma City-based Devon are the largest producers. Both companies have sold off much of their offshore assets in the Gulf of Mexico and elsewhere in order to focus their attention on unconventional resources such as the Woodford and other shale plays

Woodford Shale Map

Woodford Shale News

A current view of the top 5 US gas shales

Feb 1, 2010

The five largest gas shale plays now account for about 10% of total US natural gas production, and this figure could double by 2012.

Newfield, Hess partner to explore Marcellus

Oct 14, 2009

Newfield Exploration Co. and Hess Corp. have signed a joint exploration agreement in the Marcellus Shale play.

Newfield moves to top in Woodford

Aug 1, 2009 Houston-based Newfield Exploration Co. was founded in 1989 and went public in 1993. Until the mid-1990s, the company’s sole focus area was the shallow waters of the Gulf of Mexico.

DCP Midstream begins first phase of Anadarko-Woodford shale play expansion

May 29, 2009

DCP Midstream LLC has started up new facilities servicing Anadarko-Woodford Shale resource play development in Oklahoma's Blaine and Canadian counties.

MarkWest Energy Partners, ArcLight Capital form Arkoma Connector Joint Venture

May 4, 2009

Midstream energy company MarkWest Energy Partners LP and ArcLight Capital Partners LLC have formed a joint venture dedicated to the construction and operation of the Arkoma Connector pipeline, a 50-mile interstate pipeline that will provide roughly 625,000 dekatherms per day of Woodford Shale takeaway capacity and interconnects with Midcontinent Express Pipeline and Gulf Crossing Pipeline.


AN INTERVIEW WITH ST. MARY’S TONY BEST - St. Mary’s CEO sees geographic diversity as competitive strength

Aug 1, 2007 Anthony J. (Tony) Best joined Denver-based St. Mary Land & Exploration Co. in June 2006 as president and COO.

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