Grane PRM - From Acquisition to Interpretation in Record Time

In August 2014 a full Permanent Reservoir Monitoring (PRM) system was installed on the seafloor at the Grane field; since going live, five PRM surveys have been acquired.

Efficient seismic operations and fast delivery of 4D data to the interpreters are essential components of the PRM solution.

The currently achieved time span for the Grane PRM acquisition and processing cycle is about one month; the 4D products are available to the interpreters typically 8 to 10 days after the last shot is acquired.

We first describe how a robust sequence has been designed and optimized, thanks to the successful collaboration between processing and interpretation teams.

Through a case study, we demonstrate the value of continuous fast delivery of 4D PRM seismic data; we also discuss a 4D processing flow designed to address the different acquisition geometries between vintage Ocean Bottom Cable (OBC) surveys and PRM surveys.