A review of feldspar alteration and its geological significance in sedimentary basins: From shallow aquifers to deep hydrocarbon reservoirs

Experimental investigation on the mechanical properties of a low-clay shale with different adsorption times in sub-/super-critical CO2

https://espace.library.uq.edu.au/view/UQ:345276/UQ345276_OA.pdf

A fresh approach to investigating CO2 storage: Experimental CO2-water-rock interactions in a low-salinity reservoir system

Competitive adsorption of Cd2+, Pb2+ and Ni2+ onto Fe3+-modified argillaceous limestone: Influence of pH, ionic strength and natural organic matters.

Effect of Nanofluid on CO2-wettability reversal of sandstone formation; implications for CO2 geo-storage

SO2 impurity impacts on experimental and simulated CO2–water–reservoir rock reactions at carbon storage conditions

The Jurassic-aged Precipice Sandstone and Hutton Sandstone in the Surat Basin (Queensland) are potential targets for CO2 sequestration that exhibit considerably different mineralogies. Hyperspectral logging was complemented with petrographic studies to reveal core-scale mineralogical distributions. Scanning electron microscopy and X-ray diffraction analyses of the bulk rock composition and clay (< 2 μm) fraction provided an adjunct to mineral identification. The Precipice Sandstone is interpreted to be geochemically poorly reactive with a clean, quartzose mineralogy dominated by quartz and kaolinitic clays. These clays coat grains and partially fill pores, having formed from the extensive leaching of unstable feldspars and lithics, and are commonly associated with Fe-oxide/hydroxide. The mineralogy of the Evergreen Formation is geochemically reactive and contains significant feldspar, smectite, chlorite, carbonate and kaolinite, and should therefore serve as an effective intraformational seal. Low permeab...

Mineralogical characterisation of a potential reservoir system for CO2 sequestration in the Surat Basin

CO2 and associated co-contaminant gases such as SO2, NOX, and O2 are present in gas streams from coal fired power stations. The cost of carbon capture and storage (CCS) may be reduced if CO2 can be stored safely together with the co-contaminants. Reservoir and sealing cap-rock samples from a potential carbon geosequestration site in the Surat Basin, Queensland, Australia, have been subjected to laboratory-scale experiments at simulated in situ CO2 storage conditions. Water-rock-supercritical CO2 reactions with coinjected SO2 gas were performed and compared with pure CO2 reactions on sister rock samples...

SO2 and O2 co-injection with potential carbon storage target sandstone from a fresh-water aquifer

Carbon dioxide (CO2) storage in geological media has attracted global interest as a mitigation strategy for reducing anthropogenic CO2 emissions. Aquifers are particularly attractive CO2 sinks, in part due to their extensive storage capacities, favourable petrophysical characteristics, and their proximity to CO2 source nodes. To date, studies of CO2–water–rock interactions have almost exclusively focussed on CO2 storage in deep saline aquifers. However, in locations lacking suitable saline reservoirs, such as in southeast Queensland, Australia, where aquifers are generally of low salinity, alternative storage options are being considered. One such option under active assessment is the lower interval of the Jurassic-aged Surat Basin, comprising the Precipice Sandstone, a potential low-salinity primary reservoir, the overlying Evergreen Formation, an interformational seal, and the uppermost Hutton Sandstone, an internally-baffled unit with mixed reservoir-seal characteristics. A detailed mineralogical study of the targeted reservoir system, utilising and comparing several investigatory techniques, including optical microscopy, X-ray diffraction (XRD), scanning electron microscopy (SEM) and hyperspectral logging (HyLogger), revealed differing lithologies for the three units and provided insight into their CO2 storage characteristics. The Precipice Sandstone is geochemically poorly-reactive, with a clean, quartzose mineralogy dominated by quartz and kaolins. The Evergreen Formation is geochemically reactive, containing abundant feldspar, smectite, chlorite, carbonate and kaolinite. Nonetheless, the fine-grained nature and generally poor reservoir quality indicate an effective interformational seal. The Hutton Sandstone is a heterogeneous unit with mixed reservoir-seal characteristics and reactive intervals containing smectite, chlorite, feldspars and lithics, in addition to common Ca–Fe–Mn–Mg carbonates. Variable clay matrix content and porosity, and locally-significant cementation, indicate a heterogeneous unit with the capacity to buffer emplaced CO2, providing an additional vertical component of capture and storage to the Surat Basin reservoir system. The CO2–water–rock interactions in low-salinity host formations remain largely unexplored for conditions relevant to CO2 injection and storage. In particular, there are uncertainties surrounding the impact of these interactions on mineralogy and rock quality characteristics of both reservoir and seal lithologies in the near-wellbore environment. Batch-reaction experiments conducted under simulated reservoir conditions (T = 60 °C, P = 120 bar) for 16–18 days, coupled with highresolution mineralogical and microstructural studies of rock samples, established that injection of CO2 into low-salinity formations will result in geochemical reactions that are highly dependent on lithology. Changes in aqueous fluid chemistry are attributed to the dissolution and desorption of

/pdf/co2-water-rock-interactions-in-low-salinity-reservoir-10mf04h9e7.pdf

S. M. Farquhar

Papers

A fresh approach to investigating CO2 storage: Experimental CO2-water-rock interactions in a low-salinity reservoir system

SO2 impurity impacts on experimental and simulated CO2–water–reservoir rock reactions at carbon storage conditions

Mineralogical characterisation of a potential reservoir system for CO2 sequestration in the Surat Basin

SO2 and O2 co-injection with potential carbon storage target sandstone from a fresh-water aquifer

CO2–water–rock interactions in low-salinity reservoir systems