Offset VSP in a deviated well to get converted shear waves

This paper presents a case history in which the main objective of the borehole seismic survey was to obtain information about converted shear waves, in order to support the evaluation of feasibility for an OBC project in a Tertiary reservoir, Offshore Brazil. The Offset VSP has shown a large degree of P to S conversion, at different layers. The well trajectory in combination with the source position allowed to get Shear velocities, and also to generate P and S images that provided an additional tool to evaluate the degree of P to S conversion.