WesternGeco is the world's largest seismic contracting company. It is a combination of the former Geco-Prakla and Western Geophysical. The company is owned by international oilfield services corporation Schlumberger Limited. Business WesternGeco, a member of Schlumberger family, is the world's largest geophysical services company, providing comprehensive worldwide reservoir imaging, monitoring, and development services, with the most extensive geophysical survey crews and data processing center… (More on Westerngeco)