A time-lapse seismic survey is one of the tools to monitor changes in the reservoir’s properties over time. In this case study 2D images before and after an hydraulic fracture in the Eagle Ford formation were created from walkaway VSPs with the objective of identifying the zone affected by the treatment. The study was completed with a walkabove VSP to detect potential fractures below the wellbore that could divert the hydraulic fluid and a shear wave zero offset VSP to determine the direction of the natural fractures. This information was used in the design of future hydraulic fracture programs for wells in the area.


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