The Differential Global Positioning System (DGPS) has been adapted to the oil industry by the CEA with EAP. It allows a continuous, accurate (+ or – 3 mm) and quasi-automatic monitoring of the subsidence above hydrocarbones field. The method is detailled and a simple case study explains how accurate subsidence data are able to precise the drainage pattern and help the production managment. The Airbom Laser System to measure subsidence developed with IGN is now at experimental stage. Monitoring a great number of points, it will be suited to onshore fields and allow to map the subsidence and the drainage pattern changes.

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