Object Reservoir
Dynamic reservoir characterization integrates early well production data with seismic reservoir models to predict reservoir performance. Texas based.
http://www.objectreservoir.com/

International Reservoir Technologies, Inc.
International Reservoir Technologies (IRT) provides worldwide petroleum reservoir management consulting. We specialize in using the latest state of the art modeling technology and methodology in developing new reservoirs as well as evaluating, and planning the depletion of petroleum resources through fully integrated reservoir studies.
http://www.irt-inc.com/

Roxar
Roxar is a supplier of technology for the oil and gas industry.
http://www.roxar.com/

Scheevel Geo Technologies
Practical integration of geotechnologies, geological/geophysical aspects of reservoir evaluation, well planning/execution and 3D reservoir modeling.
http://scheevel.com/

Reservoir Associates International
Geological consultants to the oil and gas industry specializing in sedimentological and diagenetic studies of clastic strata and subsurface reservoir analysis.
http://www.ra-international.co.uk/

Core Laboratories
Core Laboratories is a leading provider of proprietary and patented reservoir description, production enhancement and reservoir management services for the global petroleum industry.
http://www.corelab.com/

Knowledge Reservoir
Reservoir studies and surface transportation systems analysis. Information management expertise integrates consultant's work with client's staff and data resources.
http://www.knowledge-reservoir.com/

Reservoir Laboratories A.S.
Provides equipment, laboratory facilities and consulting services for reservoir fluid flow and petrophysical modeling, enhanced oil recovery screening, and field development planning.
http://www.reslab.com/

Consulting Reservoir Engineering
Dr. Littmann consults on reservoir engineering, underground gas storage, enhanced oil recovery, and software development.
http://www.cre-net.de

Applied Computer Engineering Inc.
ACE provides petroleum integrated reservoir studies, with software and consulting services, with special expertise in geostatistics, seismic inversion, simulation, and integration
http://www.gridstat.com/