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North Sea and NW Europe


Collectively we have extensive experience offshore Norway (>150 wells analysed), having worked on the chalk fields of the Central North Sea and numerous clastic Tertiary to Late Cretaceous sections from the North and South Viking Grabens, the Central Graben and the Møre Basin, including the Ormen Lange Field. In addition our staff have analysed a number of well sections from Mid Norway (including deepwater exploration wells) and the Barents Sea. We have provided wellsite services on many Norwegian wells, including ‘biosteering’ long-reach chalk development wells.
PetroStrat has recently completed a non-proprietary study entitled “The Lysing and Upper Lange Formations; A High Resolution Stratigraphy”. This report provides a stratigraphic framework for assessing reservoir development within the Mid Cretaceous on the margins of the Halten Terrace and Vøring Basin, offshore Mid Norway.

North Sea (UK, Norway, Denmark & Holland)
The North Sea remains one of our core areas. We have particularly strong, state-of-the-art expertise in the following areas:-

  • Tertiary clastics (Early Paleocene to Pliocene)
    PetroStrat has extensive experience of the Tertiary stratigraphy of the Central and Viking Graben areas, having assisted in the development of >20 UKCS fields that produce from Eocene and Paleocene reservoirs, providing wellsite services on over 40 wells (in order to pick casing points and/or monitor reservoir stratigraphy).Our high resolution approach has enabled subdivision of Eocene sands within the Frigg, Tay, and Skroo depositional systems of the lower Horda Formation (Unit H1), and within the Balder and Sele Formations. In addition, detailed subdivision of the Middle Eocene Horda Formation (Unit H2) at wellsite has permitted accurate positioning of casing points above Tay reservoir sands.Within the ‘earliest’ Eocene we have demonstrated the existence of sands within units S3 and S2a of the Sele Formation, in addition to the S2B (Cromarty) sands. Differentiation of these Sele sand units (via high resolution biostratigraphy) has proven vital to the development of post Forties reservoir sands in several fields.Within the Paleocene, PetroStrat have a wealth of experience within the Lista and Maureen Formations of the UK sector and Norway, having completed studies on the Andrew/Heimdal and Maureen/Ty sands in the Viking Graben and on the Andrew/Mey and Maureen sands of the Central Graben area.

    PetroStrat has unrivalled experience in the palynostratigraphy of the Forties Sandstone Member, having undertaken intensive studies on over 100 well sections from 12 fields that produce from Forties reservoirs. We have demonstrated that Forties sands vary in age from field to field, and between wells within individual fields. We are actively involved with development drilling on several fields, providing non-acidic wellsite palynological services to assist with picking casing points and geosteering highly deviated and horizontal wells.

  • Chalk (Late Cretaceous and Early Paleocene)
    We have vast experience in chalk sections, including wellsite monitoring or “biosteering” of many long-reach development wells in the UK, Danish and Dutch sectors (and the giant Norwegian fields).
  • Early Cretaceous
    PetroStrat personnel have extensive biostratigraphic experience of Early Cretaceous Fields and single exploration wells throughout the UK North Sea including the Central Graben, Fisher Bank, South Viking Graben, North Viking Graben and West of Shetlands. This has often included extensive multi-well re-analysis/review of previous biostratigraphic data of variable quality and vintage, followed up by infill analysis. In addition we have worked on Danish Early Cretaceous Reservoirs including the Valdemar, Tyra and Adda fields, extensive review of vintage data and re-analysis of Lower Cretaceous sections.This work has included numerous wellsits in the UK, Norwegian, Danish and Dutch sectors, including horizontal biosteering in Early Cretaceous reservoirs and assisting casing and coring picks within the Cromer Knoll Group.
  • Jurassic
    We have strong expertise in North Sea Jurassic micropalaeontology/palynology and stratigraphy and a particular expertise in radiolaria following John Gregory’s Ph.D. research. PetroStrat has considerable experience in integration and re-interpretation of large regional datasets (biostratigraphy, lithostratigraphy and sequence stratigraphic correlations) within the Moray Firth, Central and Viking Grabens. Micropalaeontology has proven invaluable during wellsite monitoring of HP/HT wells where palynology is not viable (due to steep thermal maturation gradients).

NW Europe
Within North West Europe, many of our staff have worked on sections from a variety of countries and stratigraphical intervals including from Portugal, Spain, France, Poland, Romania, Bulgaria, Ukraine, Kazakhstan and Russia. Please email for further information of specifics.