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

Waterfracs prove successful in some Texas basins

Mar 20, 2000 Several operators have found that waterfracs with minimal proppants effectively stimulate low-permeability gas formations in several Texas basins.

Core preservation

Mar 13, 2000 Mr. Scott Montgomery's article on oil well core preservation (OGJ, Nov. 15, 1999, p. 84) reminded me of my first oil field job: core analyst for Core Laboratories Inc. in Midland, Tex.

INDUSTRY BRIEFS

May 24, 1999 BHP Petroleum Pty. Ltd. unit BHP Petroleum (Trinidad) Ltd. made a natural gas discovery with the first exploration well on its Block 2c production-sharing contract area 40 km off northeastern Trinidad. Angostura-1, in 40 m of water, flowed 30 MMscfd of gas through a 56/64-in. choke during a cased-hole test. BHP plans a second exploration well, Kitchener-1, on neighboring Block 2ab, held by operator BHP 50% and Talisman (Trinidad) Holdings Ltd. Block 2c interest holders include operator BHP 45%,

Use resistivity as indicator of source rock maturity

May 10, 1999 The resistivity of various shale source rocks has been observed to increase with depth (Bakken, Barnett, Mowry, Niobrara, Woodford, etc.). This relationship can be explained by the retention of generated hydrocarbons in micropores. The generalized process requires: 1) a volume increase during conversion of kerogen to fluid hydrocarbons; 2) a rigid framework that provides a fixed volume of available pore space, and 3) micropores with micropermeability that retain hydrocarbon globules through

EXPLORATION New basins invigorate U.S. gas shales play

Jan 22, 1996 Scott R. Reeves Vello A. Kuuskraa Advanced Resources International Inc. Arlington, Va. David G. Hill Gas Research Institute Chicago While actually the first and oldest of unconventional gas plays, gas shales have lagged the other main unconventional gas resources-tight gas and coabed methane-in production and proved reserves. Recently, however, with active drilling of the Antrim shales in Michigan and promising results from the Barnett shales of North Texas, this gas play is growing in

FLUORESCENCE ANALYSIS CAN IDENTIFY MOVABLE OIL IN SELF-SOURCING RESERVOIRS

Jun 5, 1995 Gerry G. Calhoun Consulting petroleum geologist Midland, Tex. The recent surge of activity involving self-sourcing reservoirs and horizontal drilling recognizes a little tapped niche in the domestic energy mix. Such prolific pays as the Cretaceous Bakken and Austin Chalk have drawn research interest and large amounts of investment capital. Fluorescence analysis can discern movable oil-as opposed to exhausted source rock-in such reservoirs with an inexpensive test.

ASSESSMENT OF POTENTIAL AROUND JM, WILL-O FIELDS, VAL VERDE BASIN

May 22, 1995 Ali Said Trabelsi David K. Davies & Associates Inc. Houston A relatively deep Cambro-Ordovician Ellenburger gas prospect exists around JM gas field in Crockett County and Will-O gas field in Val Verde County of southern West Texas (Fig. 1) (31263 bytes) . These fields, discovered in 1965 and 1971, respectively, produce nonassociated gas from Ellenburger carbonates. Average porosity of the reservoir rocks is 4%, and permeability ranges between 0.1-10.0 md.

TIGHT OKLAHOMA GAS SANDS REMAIN AN ATTRACTIVE PLAY

Apr 24, 1995 Gary L. Cartwright Marathon Oil Co. Oklahoma City The Cherokee tight gas sands of Oklahoma remain an attractive play because of improvements in drilling and completion practices and actions by the Oklahoma Corporation Commission (OCC) that allow separate allowables for new wells. The expired federal tax credits for tight gas wells, as highlighted in a recent article,1 have not been the only reason for increased activity.

MODERN DEVONIAN SHALE GAS SEARCH STARTING IN SOUTHWESTERN INDIANA

Feb 27, 1995 Edward D. Minihan , Ray D. Buzzard Consulting petroleum geologists Fort Worth The New Albany shale of southwestern Indiana is a worthwhile exploration and exploitation objective. The technical ability to enhance natural fractures is available, the drilling depths are shallow, long term gas reserves are attractive, markets are available, drilling costs are reasonable, risks are very low, multiple drilling objectives are available, and the return on investment is good. Indiana Geological Survey

SOURCE, RESERVOIR PROMISE SEEN IN MARATHON-OUACHITA OVERTHRUST

Sep 26, 1994 Ali Said Trabelsi David K. Davies & Associates Inc. Houston The Permian Basin of West Texas is a prolific 7 oil and gas province that has been extensively explored, but the Marathon Ouachita overthrust area of Pecos County, Tex., is not fully explored. Rocks of the Ouachita fold belt have been generally regarded by most petroleum geologists as metamorphosed and unsuitable for oil and gas accumulation.

EXPLORATION

May 9, 1994 The government of Russia's Sakiia republic has opened an international competitive bid round for licenses to explore for, produce, and/or process hydrocarbons in the republic.

INDUSTRY BRIEFS

Oct 26, 1992 TRANSCANADA PIPELINES, Calgary, lot contracts valued at more than $200 million to Westinghouse Electric Corp. to supply two 150,000 kw combined cycle power plants in North Bay and Kapuskasing, Ont. The plants will use waste heat from TransCanada's pipeline compressors and natural gas from western Canada to fuel combined cycle power generation.

MARKETS -- NOT REGS -- HIKE GAS PRICES

Oct 5, 1992 Gas prices are increasing in the U.S. because of market fundamentals, not because of new gas proration schemes, a panel of state regulators agreed at the International Association of Drilling Contractors' annual meeting. Regulators from Texas, Louisiana, and Oklahoma, states that account for about 75% of U.S. marketed gas production, said they are changing gas proration systems in their states to keep up with evolving markets. For drilling contractors, those markets involve an alarming

STUDY FINDS NEED FOR BETTER DATA ON U.S. GAS

Sep 28, 1992 The U.S. natural gas network needs an information system that can reliably and accurately report gas deliverability, a federal study says. A joint Federal Energy Regulatory Commission and Department of Energy task force took 2 years to prepare the study.

FRACTURED ZONES DRAW HORIZONTAL TECHNOLOGY TO MARIETTA BASIN

Mar 30, 1992 M.G. Whitmire Bandera Petroleum Inc. Tulsa Vertically fractured, low permeability reservoirs have long frustrated the efforts of oil and gas operators. Oil men, risk takers by nature, cannot resist the challenge to try to beat the average, subeconomic well and get the better wells. The advent of horizontal drilling technology gave new life to these hopes, and a number of drilling mini-booms developed in a diverse, widespread variety of vertically fractured U.S. reservoirs. Results to date have

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