Wellsite Biostratigraphy



  • To monitor the stratigraphic progress of wells
  • To assist in setting casing points
  • To monitor coring programmes
  • To confirm age dependent TDs
  • To steer horizontal wells (biosteering)


Wellsite operations may involve any of the biostratigraphic disciplines (micropalaeontology, nannopalaeontology or palynology) and in certain situations it may be necessary to run several disciplines together (usually micropalaeontology and nannopalaeontology, less commonly micropalaeontology and palynology).

Continuous 24-hour monitoring can be provided using 2 biostratigraphers, each working a 12-hour shift. There are also occasions when a fully qualified Robertson technician has to work alongside the specialists to prepare samples for analysis.


Standard ("picked residue") micropalaeontological and nannopalaeontological analyses involve no hazardous chemicals and require minimal equipment. These types of analyses are conducted in the logging unit.

Wellsite palynology and thin-section micropalaeontology need a larger amount of equipment - in the case of the former, a mobile laboratory complete with fume cupboards needs to be set up, while for the latter it is necessary to dispatch thin sectioning equipment. Due to time constraints, thin sectioning and palynological preparation are ideally performed by a Robertson technician, so freeing the biostratigraphers to concentrate on analyses and to keep up-to-date with the drilling status.

Wellsite experience

Robertson has carried out wellsite biostratigraphy in the following regions:

  • Barents Sea
  • Throughout the North Sea
  • Offshore Ireland, France, Spain and Portugal
  • Morocco, Cote d'Ivoire, Cameroon, Equatorial Guinea, Gabon and Namibia
  • Kenya, Somalia and Egypt
  • Oman, Qatar, UAE, Kuwait& Pakistan
  • Indonesia and Papua New Guinea
  • South America - Peru and The Falklands
GeoConsulting - Biostratigraphy


Wellsite and routine stratigraphic services (micropalaeontology, palynology and nannofossils), high resolution reservoir stratigraphy, sequence stratigraphic evaluation and more.

GeoConsulting - Biosteering


Assisting in the positioning of the well at the optimum reservoir level and enabling recognition of (and correction for) faulting and/or unanticipated changes in stratal dip.

GeoConsulting - Wellsite Biostratigraphy

Wellsite Biostratigraphy

Monitoring the stratigraphic progress of wells, assisting in setting casing points and monitoring coring programmes.