--> Abstract: Reservoir Characterization of the Barnett Shale, Newark East Field, TX, by R. M. Slatt, P. Singh, G. Borges, R. Perez, R. M. Portas, J. Vallejo, M. Ammerman, and E. Eslinger; #90078 (2008)

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Reservoir Characterization of the Barnett Shale, Newark East Field, TX

Roger M. Slatt1, Prerna Singh1, Gabriel Borges1, Roderick Perez1, Romina M. Portas1, Julieta Vallejo1, Mike Ammerman2, and Eric Eslinger3
1School of Geology and Geophysics, University of Oklahoma, Norman, OK
2Devon Energy Co., Oklahoma City, OK
3Eric Geoscience Inc., Glenmont, NY

Barnett Shale is currently one of the most active shale gas plays in the US. This unconventional shale reservoir is often considered to be homogeneous, undifferentiated black shale. Our studies show a significant, cyclical variation in the internal stratigraphy of the Barnett Shale in the core area of Newark East Field, Forth Worth Basin.

There are multiple objectives of this multidisciplinary study: (1) to develop a log- , core- and seismic-based stratigraphic framework for regional mapping of stratigraphic and petrophysical units within the area; (2) provide lithologic/mineralogic input to determine petrophysical rock properties from well logs; (3) develop a systematic workflow for characterizing gas shales; (4) provide educational opportunities for students who can then pursue gas shale studies as part of their careers. The workflow developed begins with core description (including thin section and micropaleontology) and integrating with wireline logs, followed by calibration to high resolution seismic and microseismic data.

The study area covers approximately 100 sq.miles. A detailed visual and petrographic description of long continuous core has been completed. Core lithofacies have been calibrated to logs, then identified in uncored wells using cluster analysis (GAMLSTM) which groups the rock intervals with similar multilog response. These facies have been calibrated to seismic response from 3D seismic surveys, then extended to the regional scale by seismic mapping. A stratigraphic framework was developed by analyzing lithofacies stacking patterns, then defining parasequences. Microseismic was integrated in order to identify potentially fracturable lithofacies. Ultimately an integrated geological model has been built of the study area which is at present being extended to new areas of the Barnett Shale.

This project is funded by Devon Energy Co.

 

AAPG Search and Discover Article #90078©2008 AAPG Annual Convention, San Antonio, Texas