Petrophysical database for volcaniclastic rocks (CASP.IVR.1)
There is a need to characterise the petrophysical properties of a variety of volcaniclastic rocks in a consistent manner, so that injectivity rates, CO2 storage potential and sealing capacities can be adequately constrained. As the diagenetic histories of volcaniclastic rocks are complex it is essential to understand the relationship between mineralogy and permeability (and porosity) to determine the potential trade-off between higher reactivity and typically lower permeability with increasing volcanic rock fragments. In addition, the project will evaluate the mineral carbonation potential of the volcaniclastic rocks, which may be a benefit over conventional reservoirs.
This project will compile a database of petrophysical properties for at least 100 volcaniclastic rocks with a variety of compositions (e.g. mafic v felsic, subalkaline v alkaline) and textures from different depositional settings (e.g. subaerial, submarine, rifts, subduction zones). The database will incorporate data from a variety of techniques (e.g. point–count data, Poro–Perm, MICP, QXRD) as well as published data where possible. The database will also include whole-rock geochemistry and quantify the abundance of elements (e.g. Ca2+, Mg2+, Fe2+) that will react with CO2 fluids, whilst SEM elemental phase maps (and tabulated data) will characterise textural relationships. A qualitative scheme will be developed to rank the likely impact of the various volcaniclastic rocks on CO2 injection, storage and/or seal capacity. The petrophysical data can be exported for modelling in, for example, Petrel reservoir engineering software, to constrain uncertainties in potential volcaniclastic reservoirs (not undertaken in this study).
Results will be delivered via a data release with associated presentation and a final technical report containing the following data for at least 100 volcaniclastic rock samples:
- Sample information data table
- Point-count data table
- Porosity–Permeability data table
- Qualitative X-ray Diffraction (QXRD) data table
- Individual and summary Mercury Injection Capillary Pressure (MICP) data tables with CO2 column height data
- An interactive Excel spreadsheet to adjust MICP parameters to reservoir conditions
- X-ray Fluorescence (XRF) whole-rock major element data table
- Inductively Coupled Plasma–Mass Spectrometry (ICP–MS) whole-rock trace element data table
- Scanning Electron Microscopy–Backscattered Electron (SEM–BSE) and Secondary Electron (SE) imagery
- Scanning Electron Microscopy–Energy Dispersive X-ray Spectrometry (SEM–EDS) data tables and elemental phase maps
The data will be delivered as individual tables, but also in a PostgreSQL database with a PostGIS extension. The technical report will also explore the interrelationships between the different data types.
The project has a planned duration of 15 months.
Contact: Simon Passey for further information about this research and licensing options.
- Mudrock Seals in CO2 Storage Systems Thematic Research
- Bunter Sandstone Storage Complex Thematic Research
- A palynozonation of the Bunter Sandstone CO2 storage complex: onshore analogue study (CASP.BSSC.1)
- Palynostratigraphy of the Bunter Sandstone CO2 storage complex in the Southern North Sea (CASP.BSSC.2)
- Cyclostratigraphy of the Early to Middle Triassic of the Southern North Sea (CASP.BSSC.3)
- Reservoir composition and diagenesis (CASP.BSSC.4)
- Controls on Bunter Sandstone composition (CASP.BSSC.5)
- Middle Triassic seals – onshore analogue study (CASP.BSSC.6)
- Middle Triassic seals – UK and Dutch offshore wells study (CASP.BSSC.7)
- Reactions and Flow of CO2 Fluid in Compositionally Immature Sandstones Thematic Research
- The Impact of Volcaniclastic Rocks on CO2 Storage Thematic Research
- Data Packages
- Geological Collections and Data