ИСТИНА

Actuality of investigation of the Cretaceous terrigeneous complex structure in the Barents Kara sea region deals with presence of unique gas condensate fields in the Aptian-Cenomanian deposits of the Kara sea, multiple oil shows in the Valanginian-Barremian deposits in the Norwegian part of the Barents sea and rare gas shows in the Aptian deposits in the Eastern Barents sea. The main property of the Cretaceous complex in this area is cyclicity which controls petroleum prospects. Study of the Cretaceous complex structure is based on an interpretation of well log data from the Barents sea, the Kara sea and the Yamal peninsula, as well as interpretation of regional 2D-seismic data, which were held jointly with MAGE and SMNG (fig. 1). Based on 2D-seismic interpretation several regional reflectors are identified in the Cretaceous section of the South Barents trough. These reflectors correspond with intra Cretaceous unconformities which limit the seismic-stratigraphic complexes formed in different sedimentation conditions.