Contrast enhanced through casing hydraulic fractures mapping

Hydraulic fracturing is being performed in more than 60 years in more than a million wells and counting. Despite the long history in hydraulic fracturing, the growth of fractures over time is not well understood. The creation of hydraulic fractures can be monitored in real time via micro-seismic method. However, this method is only effective during fracturing process. After hydraulic fractures are created, the growth of fractures remains unknown. There is a lack of methods to effectively characterize fractures in the post fracturing period.