North Texas Barnett Shale Gas Potential

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					 North Texas
 Barnett Shale
Gas Potential ???
 Presented by Dan Steward

Fall Kickoff Panel Discussion
       Fort Worth SPE
       October 23, 2008
    North Texas
     Structural            Red River Arch
     Provinces




                                                              M
                                                Barnett




                                                                  ue
                                                        Th
                                                or Abse in




                                                                       ns
with Estimated Extent of                                nt




                                                                          ter
 Oil & Gas Prone Areas




                                                                                Ar
      in the Barnett




                                                                                  ch
                                                              Vi o
                                                              V io

                                                                   la
                                                                  la

                                                                      Pr
                                                                       Er it

                                                                         es
                                                                         Li m
                                                                          os

                                                                           en




                                                                                               t
                            Bend Arch




                                                                             io n




                                                                                         Be l
                                                                              t
   Gas Prone




                                                                                 al




                                                                                           d
                                                                                       Fol
   Oil Prone




                                                                                   ust
                                                                                Thr
   Transition                           Ba
                                             rn
                                               et




                                                                             it a
                                                  t   Th
   Viola Erosional Limit




                                                                          ach
                                                        in   ??




                                                                       Ou
                              Llano
                              Uplift
Barnett Core in Faulted Area
Barnett Core Showing Minor Faults
      and Regional Fracture
Barnett Core with Regional Fracture
Micro-Reservoir System:
Porosity Increase due to Organic Carbon Decomposition


                              Assume 35% carbon loss
         By volume (14%)         due to generation




                             4.90% porosity increase




Jarvie et al., 2007a
Pores and C-rich Areas: Barnett Shale



                         Areas of higher TOC




                          Reed, Loucks, and Jarvie, 2008
Nanopores in the Barnett Shale
                   Green dots are
                   10 nm diameter




                       Reed, Loucks, and Jarvie, 2008
    North Texas
     Structural            Red River Arch
     Provinces




                                                              M
                                                Barnett




                                                                  ue
                                                        Th
                                                or Abse in




                                                                       ns
with Estimated Extent of                                nt




                                                                          ter
 Oil & Gas Prone Areas




                                                                                Ar
      in the Barnett




                                                                                  ch
                                                                                  MEC




                                                              Vi o
                                                                                  Kathy Keele 3




                                                              V io

                                                                   la
                                                                          MEC




                                                                  la

                                                                      Pr
                                                                          TP Sims 2




                                                                       Er it

                                                                         es
                                                                         Li m
                                                                          os

                                                                           en




                                                                                                 t
                            Bend Arch




                                                                             io n




                                                                                             Be l
                                                                              t
   Gas Prone                                                                          EOG




                                                                                 al
                                                                                      Fowler 6




                                                                                           d
                                                                                       Fol
                                                                                       Chevron
                                                                                       Mildred Atlas 1
   Oil Prone




                                                                                   ust
                                                                                Thr
   Transition                           Ba
                                             rn
                                               et




                                                                             it a
                                                  t   Th
   Viola Erosional Limit




                                                                          ach
                                                        in   ??




                                                                       Ou
                              Llano
                              Uplift
Barnett Type Log
Kathy Keele Area
 Gas Productive
 Section
Acknowledgements

Republic Energy Inc.
    Brad Curtis
    Dan Jarvie
  Emily Mitchell
                                      Dan Steward
Dan Steward is currently a consulting Geologist with Republic Energy Inc in Dallas,

Texas. During the period between 1981- 2001, he was at Mitchell Energy and was a

member of the team responsible for recognizing, evaluating and evolving the Barnett

Shale Play in the Fort Worth Basin.



During that 20-year period he held a number of positions within company management

but was always involved in the play in one capacity or another.



After the Company’s merger with Devon in 2002, Dan joined Republic Energy and

continued his involvement with the Barnett Shale through their activities. This

partnership has allowed him to apply the understanding of organic shales acquired from

the Barnett to other shales across the United States.



In 2005, Dan was asked to write a history of the evolution of the Barnett play by George

P. Mitchell. This history is currently available from the North Texas Geological Society

or the Fort Worth Geological Society. In addition to this honor, Dan was selected by the

American Association of Petroleum Geologists for their 2007 Explorer of the Year

Award for his role in establishing the Barnett as one of the largest gas producing fields

in the country.