Barnett shale play

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Figure 1 Barnett Shale Field.[1]

The Barnett Shale gas play refers to an extensive gas development project covering portions of at least 18 counties in the northeast portion of the Bend arch Fort Worth Basin in Texas. Production occurs from organic rich shales of the Mississippian aged Barnett shale. The Newark East field is the field designation established by the Texas Railroad Commission for productive portions of the Barnett Shale Play area.[2]

History

The Newark East field was discovered in 1981 by Mitchell Energy Corporation (acquired by Devon Energy). The development of the field started slowly, and only 100 wells were completed between 1981 and 1990. In 1998, a major breakthrough in completion techniques occurred when water fracturing replaced gel fracturing. From 1997 to 2006, more than 5829 wells were put on production, and hundreds of additional wells were drilled, completed, or waiting on a pipeline. Vertical wells were the primary drilling method until 2002 when seven experimental horizontal wells were drilled. The excellent success of these wells prompted many operators to move their drilling mode from vertical to horizontal. The early development of the fields (up until 2007), is outlined by Martineau.[3] Development activity continues today with over 14,000 active gas wells as of January 2015.

Barnett Shale

Figure 2 Generalized subsurface stratigraphic section of the Bend arch–Fort Worth Basin province showing the distribution of source rocks, reservoir rocks, and seal rocks of the Barnett-Paleozoic Total Petroleum System. From Pollastro.[4]

The Barnett Shale is a Late Mississippian aged organic rich shale. It serves as the reservoir, source and seal for the Newark East field. It is also the primary source for petroleum in the Fort Worth Basin, and has been the source rock of oil and gas for other conventional reservoir systems in the basin such as the Ellenburger, Strawn, and others. Jarvie et. al,[5] Montgomery,[6] and Hill,[7] published on the Barnet shale potential, and a Special Edition of the AAPG Bulletin (April 2007), was dedicated to the Barnett shale and Newark East field.

Production

Gas production reached its highest level to date in 2012, with an average of 5,743 Million Cubic Feet (MMCF) of gas per day, during 2014 production averaged 4,920 MMCF/day. The field also produced oil and condensate at an average rate of 3,207 and 15,757 bbls/day respectively in 2014. Latest production statistics are available from the Texas Railroad Commission.[2]

In 2013, Browning, et. al.,[8][9] reported on work underway with the Bureau of Economic Geology aimed at determining ultimate production for the Barnett Shale. At that time the Barnett had produced over 12.5 TCF of natural gas, with ultimate production in the range 45 TCF estimated.

Significance

As of 2009 the Barnett (Newark East field) was the largest gas field in the U.S. by proven reserves.[10] However by 2015, in an update by the EIA, it was ranked number 2 having been surpassed, by another shale play, the Marcellus Shale in Pennsylvania and West Virginia.[11] Perhaps more importantly however, the success of developing the Barnett Shale has opened the door for success not only the Marcellus but also in other gas plays in the United States such as the Woodford, Fayetteville and Haynesville and others.

Other sources

  • Singh, P., R. Slatt, & W. Coffey, 2008, GCAGS transactions.

References

  1. Texas Commission on Environmental Quality
  2. 2.0 2.1 Texas Railroad Commission, Barnett Shale Information.
  3. Martineau, D. F., 2007, History of the Newark East Field and Barnett Shale as a gas reservoir: AAPG Bulletin, v. 91, no. 4, pp. 399-403.
  4. Pollastro, R. M., D. M. Jarvie, R. J. Hill, & C. W. Adams, 2007, Geologic framework of the Mississippian Barnett Shale, Barnett-Paleozoic total petroleum system, Bend arch--Fort Worth Basin, Texas: AAPG Bulletin, v. 91, no. 4, pp. 405-436.
  5. Jarvie, D. M., R. J. Hill, T. E. Ruble, & R. M. Pollastro, 2007, Unconventional shale-gas systems: The Mississippian Barnett Shale of north-central Texas as one model for thermogenic shale-gas assessment: AAPG Bulletin, v. 91, no. 4, pp. 475-499.
  6. Montgomery, S. L., D. M. Jarvie, K. A. Bowker, & R. M. Pollastro, 2005, Mississippian Barnett Shale, Fort Worth basin, north-central Texas: Gas-shale play with multi–trillion cubic foot potential: AAPG Bulletin, v. 89, no. 2, pp. 155-175.
  7. Hill, R. J., E. Zhang, B. J. Katz, & Y. Tang, 2007, Modeling of gas generation from the Barnett Shale, Fort Worth Basin, Texas: AAPG Bulletin, v. 91, no. 4, pp. 501-52
  8. Browning, J. R., S. Ikonnikova, G. Gulen, E. Potter, K. Medlock, F. Male, S. Horvath, T. Patzek, Q. Fu, F. Roberts, and S. Tinker, 2013, Barnett Gas Production Outlook, Search and Discovery Article #10541 .
  9. Browning, J., S. W. Tinker, S. Ikonnikova, G. Gülen, E. Potter, Q. Fu, S. Horvath, T. Patzek, F. Male, W. Fisher, & F. Roberts, 2013, Barnett shale model-2 (Conclusion): Barnett study determines full-field reserves, production forecast: Oil & Gas Journal
  10. Energy Information Agency, 2009, Top 100 Oil and Gas Fields By 2009 Proved Reserves
  11. Energy Information Agency, 2015, Top US Oil and Gas Fields March 2015