Improving sensor technology brings a new level of reservoir understanding

The Geophone Accelerometer (GAC) sensor was first developed in 1990 for borehole seismic applications as an omni-tiltable device that can be used in deviated wells without the need for a gimbal mechanism (Obuchi and Fujinawa., 1991). The improved performance of GAC sensors in terms of calibrated response and vector fidelity has opened up many advanced applications. In this paper we trace the development of the GAC and highlight its performance in comparison to traditional geophones.