RESERVOIR GEOLOGY
We pride ourselves on taking a holistic approach to the challenge of reservoir characterisation whether for the oil & gas or geothermal industries.
Our multi-disciplinary team can help you in a range of reservoir geology studies, data integration and training. We tailor robust and flexible workflows to provide practical solutions for field development potential at any stage of field life cycle.
FRACTURED RESERVOIR CHARACTERISATION
INTRODUCTORY TEXT
SEDIMENTOLOGY
INTRODUCTORY TEXT
Our view about models is that the crucial step is data analysis, preparation and conceptualisation of the model, so that anything done in clever software is properly constrained, and its output critically assessed.
We have provided clients with robust parameters and concepts for reservoir models in a wide range of settings, for example in Russian Permian carbonates, basements of Arabia and Europe, Mesozoic carbonates of the UK and Iraqi Kurdistan, and Ordovician quartzites of Algeria.
Within this context we have developed a specialist niche in the evaluation of Discrete Fracture Network (DFN) models and also the evaluation of fracture porosity ranges for reserve calculation. Recently this has been applied in many carbonate reservoirs around the world, especially Iraqi Kurdistan.
RESERVOIR MODELS
RESERVOIR MODELS
We believe core studies are a fundamental starting point for reservoir characterisation, especially for fractured reservoirs. We have logged thousands of metres of core over the years.
We study sedimentological and fracture logging, and petrographic studies in Tertiary to Palaeozoic carbonates and chalks, clastics, glaciogenics, volcanics, and igneous to metamorphic basements. Locations include: West of Shetland, N. Sea, N. Africa, Russia, Ecuador, UK onshore, Croatia, Alaska, Iraqi Kurdistan, Uganda, Yemen, and Oman.
Most often this involves geostatistical analysis of the results, and integration with other downhole data especially image logs.
CORE STUDIES
CORE STUDIES
Present-day earth stress is often an important influence on fracture apertures and hence permeability. Working with such ‘stress-sensitive’ reservoirs is a major strength at GeoScience because of our strong geomechanics team.
Many of our image log and reservoir model studies have involved estimation of the azimuth and magnitude of the principal stress axes to produce profiles of stress with depth through the overburden and reservoir. This has been applied in Algerian Lower Palaeozoic, and Mesozoic formations, North Sea basement, the Arabian Shield of the Middle East, and active tectonic provinces such as the Zagros of Iraq.
Our blend of geologists and geomechanics engineers have all the skills necessary to tackle this specialist topic with confidence.
CRITICAL SHEAR
CRITICAL SHEAR
Accurate knowledge of the 3D stress state is essential for an optimised field development strategy, from well planning through production to abandonment.
Our geomechanics experts will determine the 3D in situ stress state around your wells by building a geomechanical model using your well data and calibrating it to offset well drilling experience. This model can then be used as the basis for geomechanical assessments such as wellbore stability, sanding production, and compaction and subsidence. Understanding of the 3D stress state also facilitates reservoir characterisation, to determine the effect of structure on the reservoir, and to optimise flow paths.
IMAGE LOG STUDIES
IMAGE LOG STUDIES
Basement Reservoirs - A Review of their Geological and Production Characteristics
Application of Pyrenean Fractured Carbonate Outcrops for Reservoir Characterisation (Slideshow)
Reservoir Characterisation and Modelling in a Fractured Upper Cambrian Quartzite Reservoir, Algeria
Hydrocarbon Production from Fractured Basement Formations
Hydrocarbon Production from Palaeozoic Clastic and Carbonate Reservoirs
Application of Pyrenean Fractured Carbonate Outcrops for Subsurface Reservoir Characterisation
Fracture Modelling at a Pyrenean Caronate Outcrop
TECHNICAL PAPERS
TECHNICAL PAPERS
‘The best geologists are those who have seen the most rocks’. An old quote, but a sentiment to which we subscribe. We provide a range of field-based to classroom-based training options to industry geoscientists and engineers.
Our field-based fractured carbonate courses have run in the Spanish Pyrenees since 2006 and we now also offer a fractured basement field course. Classroom courses in carbonate sedimentology and diagenesis have been given in UAE, and for fractured carbonates in Kuala Lumpur, Tripoli, Kuwait and the UK. Fractured basement courses have been given in Scotland, London and Kuwait recently.
These are flexible options and can be provided in client offices on a tailored basis. Ongoing education of staff is a key to success. Please contact us for more information.