Rocktype provides a range of consulting services making use of our QEMSCAN data acquisition, including reservoir quality assessment, provenance studies and log calibration.
Understanding the mineralogy and pore space characteristics of reservoir rocks is vital in establishing the key controls on reservoir quality. Reproducible quantitative data collection and analysis are required to build predictive capability, essential to successful geological modelling and integration.
Rocktype has extensive experience providing reservoir quality assessment of clastic, carbonate and shale reservoirs.
We use a range of analytical techniques to provide detailed compositional and textural data for reservoir characterisation. Our primary tool is QEMSCAN® petrography which provides unified textural and compositional data. High resolution QEMSCAN 4 analysis (at 4 µm resolution) in particular provides mineral association data, which in turn gives a quantitative measure of pore-lining phases.
For more specialised studies we can supplement QEMSCAN with:
- Scanning electron microscopy
- Cathodoluminescence microscopy
- X-ray diffraction (XRD) analysis
- Electron microprobe analysis
Review of client data
Rocktype also conducts in-depth reservoir quality reviews using client-supplied data. We can integrate and analyse reservoir data to determine the reservoir characteristics of a unit and establish the key controls on reservoir quality. We can integrate a wide range of data, including:
- Core logs
- Core analysis
- Wireline logs
- Mercury injection capillary pressure (MICP)
- Fluid inclusions
With a team of data scientists and reservoir quality specialists, Rocktype can help you digitise, standardise and analyse your data to build an integrated model.
Our experience from exploration, production and technology teams at supermajor operators makes our geological team well qualified to assist clients in performing this important and complex work.
Rocktype provides heavy mineral analysis and sediment provenance services in collaboration with our partners at HM Research Associates.
The heavy mineral constituent of sandstone contains useful information about the provenance of sediments and diagenetic history as well as stratigraphy and reservoir quality.
The technique involves separating the heavy minerals from the bulk sand using a heavy liquid such as LST Fastfloat. The relative abundances of heavy mineral species are traditionally counted using a petrographic microscope but this can also be done with an automated mineralogy system like QEMSCAN.
In addition to the mineral count data, we perform a statistical analysis of sample characteristics and sample populations. A geological sediment provenance report can also be provided.
Single species mineral analysis
Further information about the formation and history of a rock layer can be gained from detailed studies of individual mineral species. Garnet, tourmaline, rutile, zircon and feldspar are typically used in this way.
Sample preparation involves selecting individual grains of the correct species and size fraction from the bulk sand. 50 to 200 grains may be required, depending on the analysis being performed. These grains are then set in a sample puck using epoxy resin and polished with a diamond polisher to expose the interior of the grains.
Advanced instruments including electron microprobe, ion microprobe and laser ablation inductively coupled plasma mass spectrometer (LA-ICP-MS) are used to gather mineral chemistry or isotopic data from the sample. Finally statistical analysis is applied to describe the chemical composition or age distribution of the grains.
A reservoir development team needs a reservoir quality assessment based on existing petrography and core analysis data as well as a QEMSCAN 4 project delivered previously by Rocktype.
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