Monthly Luncheon with Guest Speaker Matt Bray

11/09/2017 @ 11:30 am - 1:00 pm -

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Date/Time
Date(s) - 11/09/2017
11:30 am - 1:00 pm

Location
Rock Bottom Brewery

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Monthly Luncheon

with Guest Speaker Matthew Bray

November 9, 2017

11:30am at Rock Bottom Brewery located at

1001 16th Street, #A-100, Denver, CO 80265

Time-lapse Seismic Velocity and Attenuation Changes Associated with Hydraulic Fracturing and Production of the Niobrara Reservoir

 

Increasing the recovery factor in shale reservoirs is vital for the continued development of unconventional resources. Quantification of reservoir deformation due to hydraulic fracturing and production helps improve recovery by identification of non-stimulated and non-producing zones. Additionally, monitoring these time variant changes provides information about mesoscale fractures, which are important for obtaining accurate reservoir models. In Wattenberg Field, the Reservoir Characterization Project at the Colorado School of Mines and Anadarko Petroleum Corporation collected time-lapse seismic data in order to characterize the reservoir deformation caused by hydraulic fracturing, and production in the Niobrara Formation and Codell Sandstone. Three seismic surveys help us understand the dynamic reservoir changes caused by hydraulic fracturing and production of 11 horizontal wells within a one-square mile section. A baseline survey was recorded immediately after the wells were drilled, another survey after stimulation, and a third survey after 2 years of production.

 

Joint quantification of interval velocity and interval attenuation anisotropy provides more information about the distribution of fractures within the Niobrara reservoir interval, and how faults and joint sets influence stimulation and production. I utilize a robust layer stripping method to quantify 4D anisotropic velocity and attenuation from pre-stack seismic data (Behura and Tsvankin, 2009). Processing of the data before attenuation analysis includes noise reduction, regularization of amplitudes, and statics. Full waveform synthetics are also generated to compare to the dynamic changes observed by the seismic. Finally, time-lapse velocity and attenuation measurements are discussed, and integrated with rock physics modeling, image logs, surface microseismic, tracer data, and production information.

 

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