An operator in the Paris Basin in France wanted to understand the lateral continuity of thin reservoir layers along a lateral well and verify the overall structure to help guide optimal planning of additional lateral wells.
While logging wireline in a lateral well using a tractor to assess the formation's mechanical properties, the operator opted to acquire data with a specialized sonic reflection imaging service. The operator leveraged 3D far-field sonic data to extend sonic imaging far beyond the reach of standard sonic logging. This service is designed to image acoustic contrasts—such as layering, fractures, or faults—at a distance from the well. The goal was to determine the overall bedding structure and verify the lateral continuity of various porous-thin reservoir layers within a tighter formation. The imaging captured the structure and lateral continuity of these layers up to 40 meters from the well.
Using 3D far-field sonic service enabled the operator to map the reservoir sequence and identify a prolific dune structure 15 meters below the planned laterals. This opened up additional opportunities to develop the geothermal asset in the Paris Basin.
