The use of the instantaneous phase attribute for monitoring hydraulic fracturing stimulation in the Niobrara Formation, Wattenberg Field, Colorado
Stephen Paskvich and Thomas Davis
Journal name: First Break
Issue: Vol 37, No 4, April 2019 pp. 55 - 61
Special topic: Passive Seismic & Unconventionals
Info: Article, PDF ( 810.42Kb )
Identifying understimulated areas of unconventional reservoirs is important for developing strategies to maximize field drainages. We use time-lapse multi-component seismic data collected by the Reservoir Characterization Project and Anadarko Petroleum to monitor a hydraulic stimulation in a section of Wattenberg Field, Colorado. We highlight regions of the reservoir where more fractures opened during the stimulation using instantaneous phase to estimate phase differences between pre- and post-stimulation seismic volumes. The remaining areas are interpreted to be understimulated, and analysis of fluid data suggests that the reservoir volume maybe be further drained. Phase shift maps deliver a means to target future infill drilling. Bishop and Nunns (1994) presented a method to calculate phase and traveltime differences between different vintages of 2D seismic data. The method estimates amplitude, traveltime, and phase angle corrections to reduce variations between seismic data acquired at different times but that were not necessarily designed as time-lapse surveys. The process is common in time-lapse analysis workflows available commercially.