 These concepts are  illustrated on two different 3D field datasets . The first one illustrates structural uncertainties on a merge of different seismic surveys in the North Sea. The second one shows the impact of structural uncertainties on gross-rock volume computation .
<clarity>  These concepts are  illustrated on two different 3D field datasets . The first one illustrates structural uncertainties on a merge of different seismic surveys in the North Sea. The second one shows the impact of structural uncertainties on gross-rock volume computation .
 These concepts are illustrated on two different 3D field datasets .