Downhole seismic sources for Reverse 3D-VSP surveys

Acquisition of Reverse 3D-VSP with Downhole seismic sources and large amount of surface seismic sensors is desirable in many instances. A non exhaustive overview of existing powerful prototype downhole seismic source devices is presented, as well as the main results obtained in a recent past, as well as the emerging technology which can contribute to industrialise the Reverse 3D-VSP method. Discussion with industry is welcome