Fracture Evolution with Fluid Injection and Production in the Barnett Shale

Noha Farghal, USGS

Wednesday, June 12, 2019 at 10:30 AM

Location:
Building 3, Rambo Auditorium

Unconventional reservoirs are becoming increasingly important on the world energy stage. Such reservoirs need stimulation in order to be produced in an economically viable way, unlike conventional sources. Nevertheless, unconventional recovery factors are still considerably low, and further research contributions are needed to better understand how these reservoirs respond to stimulation. In this talk, I present work done at Stanford University under the supervision of Prof. Mark D. Zoback as part of my doctoral degree research. In this project, we analyzed data from two stimulated horizontal wells the Barnett Shale with different seismic surveys acquired before and after stimulation and gas production. We used 3D seismic attribute analysis to identify fractures in and around injection wells to evaluate the methods used, namely azimuth-dependent Amplitude Vs. Offset (AzAVO) and Velocity Vs. Azimuth (VVAz), and to understand how stimulation and production affected fractures in this area of the Barnett. Results showed that fracture density, rather than orientation, is more affected by the pressure introduced during stimulation and by pressure reduction with injected fluid removal and production.

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