Continuous Seismic Monitoring Available to Purchase

A field-wide permanent seismic receiver array was installed at the Valhall field during 2003. This allows for frequent time-lapse surveys , since repeat surveys are cheap, and also provides opportunities for passive monitoring. This style of continuous seismic monitoring establishes the capability for active, reservoir management, with implications for many other oilfields, worldwide. The data quality from the new array appears to be very good, and 4D seismic responses from 3 months of production/injection have been confirmed. A basic workflow for analyzing some facets of the data has been established, while most of the vector-based attributes are still at the concept stage. Fortunately, the results from earlier analysis of previous multi-component data sets help provide background for the work. Since we are dealing with a compacting reservoir and subsiding overburden, insights and ability to do rock mechanical deformation modeling will be critical to getting optimal results.