How does the 3-Dimensional seismic survey work?
A 3-D seismic survey uses sound waves to locate oil formations at great depths, much like an MRI produces a map of the human body, significantly reducing the environmental impacts of oil exploration. The process begins by creating a carefully designed grid of small seismic charges and listening devices called geophones on the surface. A specially designed sonic drill is used to sink a small diameter casing 50 to 110 feet into the earth. The sonic drill uses high-frequency vibrations to buzz through underground layers without bringing soil to the surface. A small seismic charge is placed through the casing. The casing is then withdrawn, sealing off the charge from the surface and allowing the soil to fall back into place. Once the seismic charges have been placed, geophones are positioned on the surface and turned on. The charges are then individually discharged. The resulting sound waves travel downward and reflect off layers of the earth providing a highly accurate three-dimensional m
