GEOS4 Profile

Company Profile (click image to open)

Built on the 40+ years combined experience of its co-founders, GEOS4 is a specialised service provider and consultancy to the upstream sector of the petroleum industry. We address problems in exploration, development and production using cutting-edge science, focussing on pre-drill pay definition in both conventional and unconventional plays.

There is no hype; there are no black boxes. We bridge the research-service divide, working with our customers via on-site placement and/or online networking. As a result, we can proudly boast a list of clients that includes some of the world's largest and smallest energy companies.

For the client, all of this translates into defining oil- versus gas-plays, identifying sweet spots and likely production problems, and thereby providing a prognosis of pipeline/transportation and refining costs.


GEOS4 specialises in predicting the chemical composition and physical properties of petroleum. We offer state‐of‐the‐art solutions to problems encountered in exploration and production.

Conventional petroleum systems

In conventional petroleum systems, predicting gas‐oil ratio and charge volumes (gas and/or oil) ahead of drilling is a key element of exploration strategy. Estimating the composition of the liquid phase is also critical because sulphur contents, wax contents and TAN all directly affect viscosity, recovery and price per barrel.

We predict bulk petroleum composition (e.g. paraffinic or mixed base, high or low wax, high or low sulphur) and physical state (number of phases, Psat, API gravity) using forward models based on kerogen and/or inverse models based on seeps/stains/asphaltenes. These purpose‐built compositional kinetic models are ready for direct import into Petromod®. Full geochemical screening is offered in order to select key areas and key samples for regional or prospect scale evaluations.

Unconventional petroleum systems

For unconventional petroleum systems, the lateral occurrence of the liquid‐to‐gas cut‐off must be known precisely, and production from the liquid‐prone zone must be optimised. This means that the form of the P‐T phase envelope for that shale must be known as a function of maturity. In particular the transition from volatile oil, to condensate to wet gas is crucial. Our model predicts the appropriate fluid characteristics at a given location, and is therefore instrumental in the selection of acreage at the appraisal stage of new plays, or helping to optimise production strategy later on during testing.

Kinetic parameters for oil‐to‐gas cracking and late gas generation also assist in constructing regional petroleum system definition, distinguishing liquid and gas potentials. We offer stratigraphic profiling to assess heterogeneity in terms of fluid yield and type, and, via associates, rock mechanical and petrophysical properties. As noted for conventionals, full geochemical screening is offered in order to select key areas and key samples at all stages of exploitation.

Links to Research

Our specialised service know-how and activities are coupled with an aggressive and state-of-the-art research programme at GFZ German Research Centre for Geosciences in Potsdam, Germany.