Reducing risk using multicomponent surveys - North Sea data examples

In the last five years WesternGeco has completed more than 15 3D, four-component (4C) surveys in the North Sea, using proprietary Nessie* 4C technology. These multicomponent surveys have provided greatly improved imaging in a variety of applications. The results have enabled better development drilling decisions and, hence, reduced risk. In this paper, after an introduction to 4C technology, three North Sea datasets are presented. Examples from the Brent and Beryl 4C surveys will illustrate the use of P-waves to gain dramatically improved resolution of highly faulted and compartmentalized reservoirs. The Chestnut 4C dataset will illustrate the use of converted waves to illuminate Eocene sands that have low P-wave acoustic impedance contrast with surrounding shales.