METHOD AND APPARATUS FOR TRANSFORMING FIELD WAVE TUBE WAVES FOR SEISMIC EXPLORATION

摘要

The invention relates to a rotary valve apparatus 8 for the production of modulated frequency tube waves which are injected into a wellbore 2. These waves are converted into field waves by an elongate converter 5 placed at a chosen depth. / P P The converter 5 comprises an elongated body which preferably substantially completely fills the borehole or casing 1 and has a preferred shape for efficiently transforming the tube waves into ground waves at chosen depths. . / P P Application: Advanced Seismic Exploration Process. / P